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.TITLE	"KL10 Microcode for TOPS-10 and TOPS-20 -- 18 Nov 1983 COPYRIGHT (C) 1984 DIGITAL EQUIPMENT CORPORATION"
.VERSION/MAJOR=1/MINOR=0/EDIT=336/WHO=0
.NOBIN

;	THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT
; NOTICE AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL
; EQUIPMENT CORPORATION.  DIGITAL EQUIPMENT CORPORATION ASSUMES NO
; RESPONSIBITY FOR ANY ERRORS THAT MAY APPEAR IN THIS DOCUMENT.
;	THE SOFTWARE DESCRIBED IN THIS DOCUMENT IS FURNISHED TO THE
; PURCHASER UNDER A LICENSE FOR USE ON A SINGLE COMPUTER SYSTEM AND
; CAN BE COPIED (WITH INCLUSION OF DIGITAL'S COPYRIGHT NOTICE) ONLY
; FOR USE IN SUCH SYSTEM, EXCEPT AS MAY OTHERWISE BE PROVIDED IN WRITING
; BY DIGITAL.
;	DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY FOR THE
; USE OR RELIABILITY OF ITS SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED
; BY DIGITAL.
; COPYRIGHT (C) 1975,1976,1977,1978,1979,1980,1981,1982,1983,1984 DIGITAL EQUIPMENT CORPORATION


.TOC	"REVISION HISTORY"

;	The following collection of people have contributed to the
;	production and maintenance of this code.  In reverse chronological
;	order:
;
;	QQSV (Dick Wagman) -- beginning with edit 301
;	Sean Keenan
;	Don Dossa
;	Mike Newman
;	Jud Leonard
;
;REV	WHY
;
;336	Back off 330 for a bit, since TOPS-10 7.02 must be tested and
;	OWGs in section 0 fail for string instructions (they get converted
;	to TWGs, which are illegal in section 0).  For now, we will maintain
;	both sources.
;335	Force memory to be released for SMP case of DPB if P > 36 causes no
;	actual data to be stored.  Make an OWG reference to an address >
;	37,,777777 cause a page fail (GBYTE was stripping the excess bits).
;334	Fix conflict generated in CLRPT by 333 by creating new subroutine
;	ARSWAP which is just AR_AR SWAP.  Make several other routines call it,
;	thus saving a few words.
;333	Add new conditional BIG.PT.  Under it, add code to implement the "Keep
;	me" bit for paging as bit 5 of the page table, and to move it to page
;	map bit 23 during page refill.  Also make DATAO PAG not clear Kept
;	pages if bit 3 of the word is off.
;332	Redefine all bank 7 ACs as R0,...,R17, and all bank 6 ACs as P0,...,
;	P17.  Change all other alias definitions to refer to these.  This
;	gives us a uniform cross reference for all scratch register references.
;	Put all macro definitions into alphabetical order, making it easier
;	to look up a macro definition.  Split the edit history into its own
;	file.  There are no functional changes from 331.
;331	Allow XSFM anywhere.  Clean up the code a bit in the process.  There
;	still remain a number of references to XSFM or XPCW distinctions,
;	and these could almost certainly be cleaned up further.
;330	Allow one word global byte pointers in section zero.  This includes
;	changes in BYTE, EIS, and FP.  Change GBYTE and CNV2WD to return 2;
;	eliminate GTST as obsolete.  Also shuffle the calls to these routines
;	to conform to the new calling conventions, and put the OWG test at
;	the beginning of IBP, ILDB, IDBP, LDB, DPB, and ADJBP.
;327	Add PAGCNT conditional.  Under it, include control to count entry
;	into PFH code and DATAO PAG with bit 2 set.
;326	Change VMA restoration in INC2WD and CNV2WD (see edits 320 and 307)
;	to use RSTR VMA_MQ in order to keep the global/local sense of the
;	reference.  This was causing ILDBs of OWGs in shadow memory to
;	save the incremented byte pointer in the ACs instead of memory.
;325	Add VMA/LOAD to local indexed EA computation for EXTEND E1 to make
;	it read the section number from VMA instead of PCS (!) if the index
;	is section local.
;324	Force the XADDR conditional to use RPW type references for DPB and
;	IDPB if the SMP conditional is on, even if one word globals are not
;	active.
;323	Add missing constraint near NOT.WR, accidentally broken by 322.
;322	Generate the A(cessible) bit in a page fail word caused by a read
;	violation if the page is otherwise accessible and if no CST is present.
;	This could be fixed for the CST present case as well, but has been
;	deferred since we are tight on space and no one seems to need it
;	anyway.
;321	Prevent statistics microcode from losing traps by forcing NICOND
;	dispatch 11 to ignore the statistics and take the trap.
;320	Restore the VMA again in INC2WD (broken by 307), since the state
;	register bits may have changed in the interim.  This was causing
;	PXCT to do surprising things (mostly bad).
;317	Originally, this was an attempt to uncount multiply counted op
;	codes which resulted from interrupts during long instructions.
;	That project has been shelved for now.  Instead, the second
;	NICOND dispatch during op code counting has had its final constraint
;	fixed.
;316	Make counting only version compatible with time and counting by making
;	counting only version use TRX2 and TRX3, removing physical contiguity
;	requirement.
;315	Op code counting lives again!  The setup code activated by DATAO PI
;	was attempting to write the TRX registers with data fresh from memory,
;	resulting in parity checks when it was used (see edit 73, for example).
;	Juggle code to overlap next address calculation with parity wait.
;314	Add CST.WRITE conditional to facilitate assembly of microcode
;	without the CST writable bit (see edit 303).
;313	Put TIME/3T on XFERW, as the assembler was getting the wrong
;	value with both AR_MEM and ARX_MEM macros present.
;312	Fix definition of BYTE RPW to include a write test.  This was
;	causing the SMP version of DPB to hang when memory was readable
;	but not writable.
;311	Make all IOP function 7 style of references look in the cache.
;310	Improve the fix in 307 to save the computed E0+1 in FILL during
;	OWGBP conversion and to restore the VMA from there when done.
;	Also, make sure that the VMA is initialized to PC for all cases
;	when doing effective address calculations for two word globals
;	in string instructions.  307 was not enough to clean up the
;	CMPSx fill problem, since VMA HELD was never loaded.
;	Force EXT2WD to prereference AC4 and AC5 so that glitch discovered
;	for second edit 210 will not be activated.
;307	Restore VMA from MQ at end of CNV2WD (and remove it from INC2WD,
;	saving a word in the process).  This was causing CMPSx to load
;	a random fill word and MOVSLJ to store to a random place when the
;	source length was zero if one word globals were in use.
;	Force page fail code to look for ARX as well as AR parity errors
;	(now possible with BYTE RPW implemented).
;	Make sign extension of E1 go to right place in EXTEND decoding of
;	offset instructions (broken in 301).
;306	Add University of Essex code to statistics (TRACKS) code to make
;	it work with address break enabled.
;305	Fix CST write bit logic to not test bit 18 when reading.
;304	Switch byte read interlock from LDB to DPB (broken in 303).
;303	Implement bit 18 of a CST entry as a write enable bit in addition
;	to all the other write enable functions.
;	Knock one cycle out of byte deposit where the byte is being
;	deposited into the high order byte of a word.
;	Implement the SMP conditional for extended addressing by
;	replicating all the byte effective address calculation code for
;	DPB.  This is unfortunate, but necessary due to the huge dispatch
;	table that ends this subroutine.
;302	Move XFERW out of EIS (which no longer absolutely requires it
;	in line) into SKPJMP (more in the heart of things).  Also
;	juggle comment lines and code layout to reduce the listing
;	size a bit and to force some of the .TOC lines into the table
;	of contents (even though the code nearby may be suppressed).
;301	Fix ADJBP so that instructions which occur at the last word on
;	a page do not cause a page failure of some random type (one cycle
;	too many between I FETCH and NICOND).
;	Fix effective address calculation for EXTEND so that only offset
;	instructions (and not GSNGL, for example) will have E1 sign
;	smeared.
;	Implement XJRST.  Also force JSP and JSR to do full 30 bit
;	effective address calculations.
;300	ADD LOAD OF VMA FROM PC IN PUTDST TO GET THE SECTION ADDRESS
;	CORRECT ON THE STRING INSTRUCTIONS.
;277	Add EA CALC table for SMP configurations of extended addressing
;	for TOPS-10.  (TOPS-20 paging)
;276	Force global EA CALC for EXTEND instructions in PUTDST.
;275	FIX THE ERROR CODE IN STRING COMPARE FOR ILLEGAL BITS IN THE
;	LENGTH FIELD. WAS CAUSING AR PARITY ERRORS.
;274	SAVE THE API FUNCTION WORD ON AN IO PAGE FAIL INSTEAD OF THE
;	PAGE FAIL WORD. THIS TAKES PLACE IN BOTH THE AC BLK 7 AC 2
;	AND THE MONITOR.
;273	PUT CONDITIONALS AROUND 4 GFLOAT CONVERSION INSTRUCTIONS.
;	THEY WILL ACT AS MUUO'S AND MONITOR WILL TAKE CARE OF THEM.
;272	CONO APR 200000 AT TIMES WAS NOT GENERATING EBUS RESET OF A
;	SUFFICIENT LENGTH TO CLEAR DTE REGISTERS. ADDED ANOTHER
;	MICROWORD SO THAT CONO APR IS NOW UP FOR TWO FULL WORDS WHICH
;	GETS AROUND THE HARDWARE PROBLEM.
;271	ILLEGAL INDIRECT PAGE FAIL (24) WAS NOT ALLOWING USER TO BE SET.
;270	WHEN IN SECTIONS > 1, AN UPDATED OWGBP WOULD BE WRITTEN INTO
;	MEMORY INSTEAD OF THE AC'S.
;267	CHANGED TESTS FOR OWGBP TO TEST FOR PC SEC0 FIRST. SAVES 33 NS.
;266	CONDITIONALS ON FOR TOPS-20 DEVELOPMENT.
;265	REMOVED EDIT 244. SOFTWARE ENGINEERING WILL SUPPLY MONITOR
;	CODE TO TAKE CARE OF PROBLEM. CODE COSTS TOO MUCH TIME IN
;	THE INSTRUCTION EXECUTION.
;264	ADDED CONDITIONALS TO CODE FOR IPA20, OWGBP AND NO CST UPDATE IF
;	CBR IS ZERO. THIS IS FOR RELEASE 5 OF TOPS-20.
;263	IBP DID NOT CLEAR FPD ON EXIT.
;262	ALLOW XBLT TO BE VALID IN SECTION 0.
;261	FIX CODE AT END OF ADJBP CODE TO CLEAR STATE REG. IF ILDB
;	WITH 2 WD GLOBAL POINTER POINTING TO ADDRESS NOT IN CORE
;	CLEAN DISPATCHES TO WRONG CODE BECAUSE SR LEFT OVER FROM
;	ADJBP.
;260	FIX FM PARITY ERRORS AT MVF1: ADDED NULL CALL TO RET2:
;	AT MVST: TO TAKE CARE OF EXTRA TICK FOR PARITY.
;257	MAKE SURE THAT THE UPDATED ONE WORD GLOBAL BYTE POINTER IS
;	WRITTEN BACK INTO THE CORRECT CONTEXT.
;256	MAKE ANOTHER ATTEMPT TO FIX PXCT OF ONE WORD GLOBAL BYTE POINTERS.
;	THE GIBP CODE GETS THE SAME CHANGES AS EDIT 255.
;255	MAKE ONE WORD GLOBAL BYTE POINTERS WORK WITH PXCT. THE STATE
;	REGISTER BITS ON MCL4 (NOT TO BE CONFUSED WITH CON3), WERE NOT
;	BEING SET PROPERLY TO ALLOW PREVIOUS ENA AND USER ENA TO BE SET.
;	GUARANTEE THAT THESE SR BITS ARE SET PRIOR TO THE LOAD OF THE VMA.
;254	FIX PROBLEM WITH OWGBP WHERE FPD DOES NOT EFFECT
;	INC OF POINTER AFTER PAGE FAIL
;253	FIXED ADDRESSING FOR SH DISP AT GADJL0:
;252	MOVE STRING INSTRUCTIONS DO NOT GET THE CORRECT DATA ON
;	LOCAL POINTERS IN NON 0 SECTIONS
;251	ADD CODE FOR ONE WORD GLOBAL BYTE POINTERS.
;	TOOK OUT EDITS 243 AND 250 TO GET ENOUGH SPACE IN CRAM
;	FOR THIS EDIT. OWGBP WITH EXTEND INSTRUCTIONS WILL NOT
;	RETURN A OWGBP. THEY WILL RETURN A TWO WORD GLOBAL BP.
;250	ALLOW SMP SWITCH TO EFFECT TOPS-20 MODEL B TO DO RPW IN
;	BYTE INSTRUCTIONS.
;247	DO NOT DO A CST UPDATE OR AGE UPDATE IF THE CBR IS ZERO.
;246	EXTEND OP CODE DECODE FOR MODEL A WAS ACCEPTING MODEL B
;	OP CODES (20-31). ADDED CONDITIONALS TO CODE TO FIX.
;245	FIX 2 WORD GLOBAL BYTE POINTER BUG WITH IBP INSTRUCTION
;	WITH EXTENDED ADDRESSING OUT OF SECTION 0
;244	FIX MOVST EXTEND INST. SO THAT ILLEGAL (> 36) S FIELD
;	DOES NOT CAUSE STOP CODE TO CRASH SYSTEM FOR TOPS-10 MODEL B.
;243	WRTIME TRIED TO DO MEM WRITE EVEN THOUGH THE INSTRUCTION
;	DOES NOT DO ANYTHING TO MEMORY. CAUSED PROBLEMS IF THE MEMORY
;	LOCATION WAS NOT WRITABLE.
;242	FIX CODE FROM EDIT 234 TO GET PF CODE OF 24.
;241	FIX DFAD AND DFMP FOR ROUNDING OCCURS PROPERLY. ADDED STICKY
;	BIT FOR LEAST SIGNIFICANT BITS OF THE RESULT.
;240	FIX GFLT INSTRUCTIONS GFIX AND DGFIX SO THEY WILL TRUNCATE NEGATIVE
;	NUMBERS IN THE CORRECT DIRECTION. THE MQ MUST BE ZERO BEFORE
;	THE ARX_2 MACRO IS INVOKED OR THE ARX MIGHT GET A 3 FROM MQ00.
;237	ADD OPTION BIT FOR PV CPU IN THE APRID WORD AS IT IS DOCUMENTED
;	IN ALL OF THE HARDWARE DOCUMENTATION. SET THE BIT ACCORDING
;	TO THE MODEL.B OPTION SWITCH. IT WILL BE MAGIC NUMBER BIT 3.
;236	ALLOW THE INTEGER DIVIDE OF THE LARGEST NEGATIVE NUMBER BY
;	PLUS ONE TO SUCCEED. THIS USED TO BE A DOCUMENTED RESTRICTION
;	THAT THIS OPERATION WOULD CAUSE AN OVERFLOW AND NO DIVIDE.
;235	FIX JRA SO IT DOESN'T FALL INTO SECTION ZERO FROM A NON-ZERO
;	SECTION EVERY TIME BY WRITING THE PC SECTION INTO THE VMAX.
;234	BUILD A PAGE FAIL CODE OF 24 WHEN AN ILLEGAL INDIRECT WORD
;	IS FOUND DURING THE EFFECTIVE ADDRESS CALCULATION IN 
;	A NON-ZERO SECTION. THE PAGE FAIL CODE WAS PREVIOUSLY NOT
;	BEING REPORTED.
;233	SAVE THE IOP FUNCTION WORD THAT APPEARS ON THE EBUS WHEN AN
;	EXTERNAL DEVICE INTERRUPTS THE CPU. SAVE THIS INFORMATION
;	ON EVERY INTERRUPT IN AC BLOCK 7, AC 3. THE CONTENTS
;	OF THIS AC WILL BE PRESERVED UNTIL THE NEXT INTERRUPT.
;	OPERATING SYSTEMS SHOULD SAVE THIS INFORMATION AS SOON AS POSSIBLE
;	IF ITS CONTENTS ARE TO BE RELIABLE AND MEANINGFUL.
;232	ADDS 13 NEW INSRUCTIONS FOR SUPPORTING FORTRAN78 ON MODEL
;	B MACHINES. THESE INSTRUCTIONS ARE:
;	       OPCODE     SYMBOL
;	       ======     ======
;		102	GFAD AC,E
;		103	GFSB AC,E
;		106	GFMP AC,E
;		107	GFDV AC,E
;		EXTEND INSTRUCTIONS    EXTEND OPCODE
;		====== ============    ====== ======
;		EXTEND AC,[GSNGL  0,E]	    21
;		EXTEND AC,[GDBLE  0,E]	    22
;		EXTEND AC,[DGFIX  0,E]	    23
;		EXTEND AC,[GFIX   0,E]	    24
;		EXTEND AC,[DGFIXR 0,E]	    25
;		EXTEND AC,[GFIXR  0,E]	    26
;		EXTEND AC,[DGFLTR 0,E]	    27
;		EXTEND AC,[GFLTR  0,E]	    30
;		EXTEND AC,[GFSC   0,E]	    31
;231	FIX IN PROBLEM IN EDIT 215 TO XDPB THAT PREVENTED THE KL
;	FROM HANDLING INTERRUPTS WHILE EVALUTAING AN INDEXED INDIRECT CHAIN.
;	AN "=0" WAS MISSING BY BYTEIP.
;230	TO PRESERVE COMPATABILITY WITH THE KS10 AND BECAUSE OF SPACE
;	LIMITATIONS IN TOPS20 MODEL A, THE SPECIFICATION FOR THE
;	CVTDBX INSTRUCTIONS HAVE BEEN CHANGED TO ELIMINATE THE NEED
;	FOR AN OVERFLOW TEST DURING THE CONVERSION. THIS CHANGE
;	EFFECTIVELY REMOVES EDIT 221.
;227	DELETE EDIT 222 AND RETURN THE CVTBDX INSTRUCTIONS TO THEIR
;	OLD, BROKEN FUNCTIONALITY SINCE ANY ATTEMPT TO PREVENT THE
;	FLAGS FROM BEING CHANGED PREMATURELY HAS TO CONTEND WITH
;	INTERRUPTABILITY PROBLEMS. THE HARDWARE REFERENCE MANUAL
;	HAS A FOOTNOTE ABOUT THE FLAG PROBLEM SO THE CURRENT FUNCTIONALITY
;	IS DOCUMENTED FOR USERS.
;226	PREVENT AR PARITY ERRORS WHEN INCREMENTING BYTE POINTERS IN THE ACS.
;225	THE CODE TO SUPPORT THE MX20 VIA THE SBUS DIAG LOOP MECHANISM
;	DOES NOT TIME OUT CORRECTLY BECAUSE THE LOOP COUNTER IS BEING
;	REINITIALIZED EVERY TIME THROUGH THE LOOP. FIX THIS PROBLEM
;	EVEN THOUGH THE CODE IS NOT ASSEMBLED IN CURRENT RELEASES.
;224	FIX BUG IN EDIT 223 THAT CAUSED THE WRONG PAGE FAIL
;	WORD TO BE WRITTEN WHEN AN I/O PAGE FAIL OCCURS.
;223	WHEN A MEMORY PARITY ERROR OCCURRS AT PI LEVEL, AS EVIDENCED
;	BY AN AR DATA PARITY ERROR, THE DTE MAY BE WAITING FOR A
;	RESPONSE. IF IT IS, A DEX FAILURE WILL OCCUR UNLESS WE CAUSE
;	DEMAND TO WIGGLE.  WE CAN DO THIS BY FORCING THE DATA  IN THE
;	AR OVER THE EBUS.
;222	CVTBDX IS NOT SUPPOSED TO CHANGE THE CONTENTS OF THE ACS
;	OR MEMORY IF THE CONVERTED NUMBER WILL NOT FIT INTO THE
;	DESTINATION FIELD. IT WAS, HOWEVER, CHANGING THE FLAGS
;	BEFORE IT KNEW IF THE NUMBER WOULD FIT.
;221	THE CVTDBX WERE FAILING TO SET OV AND TRAP1 WHEN THE
;	CONVERTED DECIMAL NUMBER WOULD NOT FIT INTO A
;	DOUBLE WORD.
;220	THE TRANSLATE INSTRUCTIONS WERE USING A 15 BIT WIDE
;	FIELD FOR THE REPLACEMENT BYTE IN THE TRANSLATE TABLE
;	WHILE THE SPECIFICATION STATED THAT THE TRANSLATE
;	INSTRUCTIONS WOULD USE ONLY 12 BITS.
;217	PREVENT CRAM PARITY ERRORS CAUSED BY DISPATCHING TO LOCATION
;	3042 WHEN INDEXING IS SPECIFIED IN THE EFFECTIVE ADDDRESS
;	CALCULATION OF E1 WHEN THE EXTEDED OPCODE IS ZERO (ILLEGAL).
;	THE FIX IS TO PUT A JUMP TO UUO AT 3042.
;216	CHANGE THE DEFAULT VALUE FOR THE SMP SWITCH TO BE ONE. THIS
;	CAUSES THE MICROCODE TO INCLUDE SMP SUPPORT BY DEFAULT.
;215	CHANGES DPB INSTRUCTION TO R-P-W CYCLE ON DATA FETCH PORTION OF
;	INSTRUCTION TO SOLVE AN INTERACTION PROBLEM IN AN SMP OPERATING
;	SYSTEM.  THIS CHANGE ONLY APPLIES TO MICROCODES FOR TOPS-10 
;	AND TOPS-20, MODEL A.
;214	ADDED CHANGES FOR XADR, RELEASE 4 AS FOLLOWS.
;	STORE PREVIOUS CONTEXT SECTION (PCS) IN FLAGS WORD (BITS 31-35)
;	IF EXEC MODE AND XSFM OR XPCW INSTRUCTION,MUUO OR PAGE FAIL.
;	RESTORE PCS FROM FLAGS WORDS (BITS 31-35) WHEN XJRSTF OR XJEN
;	IS EXECUTED IN EXEC MODE AND THE NEW PC IS ALSO IN EXEC MODE.
;213	SET/FPLONG=0 PARAMETER ADDED TO TOPS-10 MICROCODE FOR KL MODEL 
;	A AND MODEL B.
;212	CHANGE THE CODE AT LDIND: TO TEST FOR USER MODE IF USER MODE
;	TURN OFF SPECIAL CYCLE THAT MAY STILL BE ON. THE MICROCODE WILL DEPEND
;	ON KERNAL PROGRAMS TO NOT GET IN PAGE POINTER
;	LOOPS. INSTRUCTIONS EXECUTED FROM THE CONSOLE WILL NOT WORK.
;	PI INSTRUCTIONS GET A RESTRICTION TO NOT GET INDIRECT PAGE POINTERS
;	IN THEIR PAGING CHAIN AS DO EXAMINES AND DEPOSITS AND BYTE TRANSFERS.
;211	CHANGE THE TEST FOR INDIRECT POINTERS TO NOT HAPPEN ON SECTION
;	POINTERS AND JUST ON INDIRECT PAGE POINTERS. AT LDIND:+1 AND LDIMM:+2
;210	MAKE ALL AC+# MICROINSTRUCTIONS HAVE THE # FIELD THE SAME IN THE
;	PREVIOUS MICROINSTRUCTION TO SOLVE A TIMONG GLITCH IN THE HARDWARE.
;	MAKE EXCHANG MARK AND DESTINATION POINTERS UUO IF THEY DO NOT
;	HAVE BYTE POINTERS OF EQUAL LENGTH. CHANGES PERVASIVE IN EIS ALSO IN PF
;	RECOVERY IN IO.
;	MAKE THE LOAD OF AN INDIRECT POINTER CLEAR PI CYCLE IF SET.
;	THIS MEANS THAT THE MONITOR CANNOT USE KERNAL CYCLE, INSTR ABORT
;	INH PC+1 OR HALT IN A PI CYCLE IF AN INDIRECT POINTER CAN
;	BE A PART OF THE REFILL. ALSO NOTE THE POSSIBILITY OF GETTING AN
;	INTERUPT BEFOR THE PI INSTRUCTION COMPLETES. (NEVER CONTINUES PI
;	INSTRUCTION) CHANGES AT LDIND.
;207	CHANGE SBUS DIAG CODE FOR MOS PUT IT IN MOS CONDITIONAL /MOS=1
;	IF ON SBUS DIAG TRIES AT LEAST 8 TIMES TO GET A RESPONSE
;	OTHER THAN -1 IF IT GOT -1 ALL THOSE TIMES THE MICROCODE
;	GIVES UP AND RETURNS 0
;206	FINAL FIXES TO PUSHM AND POPM
;205	FIX BUG IN INDEX CALCULATION OF E1 FOR EXTENDED ADDRESSING.
;	INDEXING REQUIRED THAT AN AREAD BE PERFORMED IN ORDER TO LOAD
;	THE AR WITH A CORRECT FINAL RESULT. THE EFFECTIVE ADDRESS CALCULATION
;	AROUND EXTLA: GOT A NEW MACRO ADDED FOR INDEXING THAT DOES THE AREAD.
;	ABSOLUTE LOCATIONS IN THE RANGE 3040 GET USED AS TARGETS FOR THIS
;	AREAD THEN THE CODE REJOINS THE OLD CODE AT EXT2: 
;	THE AREAD WAS NECESSARY FOR THE HARDWARE MAGIC TO LOAD PARTS OF THE
;	AR DEPENDING ON THE INDEX REGISTER AND OTHER EXTENDED ADRESSING
;	PARAMETERS.
;204	ADD AUTOMATIC VERSION NUMBER
;	ADD CODE TO DO SBUS DIAG TESTING REQUIRED BY MOS
;203	PUT THE BLKO PAG, CHANGE IN 201 IN A KLPAGING CONDITIONAL
;	KIPAGING GETS TANGLED IN AR PARITY ERRORS AND IN GENERAL DOES
;	THE WRONG THINGS
;202	TURN OFF IMULI OPTIMIZATION IT GETS THE SIGN BIT AND THE OVERFLOW
;	FOULED UP (TURNED OFF FOR MODEL B ONLY WAS OFF IN MODEL A)
;201	CHANGE BLKO PAG, TO INVALIDATE ONLY ONE ENTRY BY CLEARING IT
;	CHANGES AT PAGBO PAGBO+1 AND CLRPT+3 CLRPT+3 GETS SETUP THAT USED
;	TO BE AT PAGBO+1, PAGBO+1 NOW CLEARS ENTRY AND QUITS
;	KLPAGE ERROR CHECK FOR TOPS 10 MODEL A TO CAUSE ERROR
;	IF SWITCH SETTINGS ARE IN CONFLICT DIDDLED
;200	CHANGE ALL EXEC REF TRACKS FEATURES BACK TO PHYS REF
;	ON SUSPICION THAT PAGE FAULTS ARE NOT HANDLED PROPERLY
;	MAKE NON TRACKS INSTR STAT FEATURES GET FOUR PHYSICAL
;	PAGE NUMBERS FROM FIRST FOUR LOCATIONS IN THE PAGE PRESENTED
;	IN THE DATAO PI, THE CODE ALSO USES THAT PAGE FIRST
;	LOCATION TO PUT THE INITIAL JUNK INTO ON STARTUP
;177	FIX SOME BUGS IN OPCODE TIMING CODE AT OPTM0: AND BEYOND
;176	ADD TO THE TIME COUNTING CODE CODE THAT COUNTS FREQUENCY
;	OF EACH OPCODE IN PAGE+2 AND PAGE+3
;175	FIX TIME COUNTING CODE TO ACOUNT FOR EACH OPCODE IN THE
;	USER OR EXEC MODE IT WAS SEEN IN, EDGE COUNTS WERE DONE IN
;	WRONG MODE CHANGES UNDER OP.TIME CONDITONALS (PERVASIVE)
;174	CHANGE TRACKS AND TIME COUNTING TO USE EXEC VIRTUAL SPACE
;	INSTEAD OF PHYSICAL SPACE
;173	SEPERATE OUT THE DISMISS AT 626: BECAUSE OF SUSPECTED BUG
;172	THE FACT THAT XJEN DISMISSES BEFORE READING NEW PC WORDS CAUSES
;	A PROBLEM FOR TOPS 20. REHASH THE CODE AT 600: TO 637: TO MAKE
;	XJEN READ THE TWO WORDS FIRST AND THEN DISMISS.
;171	CAUSE IO PAGE FAIL FIX IN 170 TO SHIFT AT END GETTING CORRECT
;	PAGE FAIL WORD CHANGE AT IOPGF:
;170	MAKE CLRFPD: GO DIRECT TO FINI: INSTEAD OF THROUGH NOP: THIS WAS
;	COSTING 2 TICS IN BYTE INSTRUCTIONS
;	CHANGE IO PAGE FAIL TO SAVE A VIRTUAL ADDRESS IN THE AC BLOCK 7
;	LOCATION 2 INSTEAD OF THE DATA THAT WAS ON THE EBUS CHANGES AT
;	PGF4:+1 AND IOPGF:
;167	CHANGE DEFAULT ON ADB MIXER SELECTS. NO DEFAULT NOW SUBFIELD U23
;	IS DEFAULTED TO 1 TO AVOID SELECTING FM AND NEEDING TO WAIT FOR PARITY.
;	THIS LEAVES THE OTHER BIT OF THE FIELD AVAILABLE FOR PARITY
;	EPT MOVED TO 540 USING SWITCH IN KLX,KLL (KLA,KLB NOW DEFUNCT)
;166	CHANGE FIELD DEFINITION FORMAT CHANGE THE WAY THE OPTIONS FIELD
;	GETS ITS VALUES ASSIGNED. EACH BIT GETS A FIELD DEFINITION.
;165	BUG IN 161 TO 164 WAS MISSING AC0 AT POP2: PARITY BIT WAS PUT THERE
;	IN THE NEWER MICROCODES
;	INSTALL MANY THINGS TO MAKE WORD STRING MOVES WORK START AT
;	MOVWD1 AND UNTILL BMVWD1 ALSO ASSORTED MACROS ARE ADDED
;	THESE ARE INSTALLED IN A SEPERATED EIS FILE (WDEIS) FOR THE MOST PART
;	THERE ARE SOME NEW MACROS AND THE CLEAN+17 LOCATION IS USED FOR
;	THIS CASE UNDER MODEL B CONDITIONAL INTERRUPTS DO NOT WORK YET
;	IN THIS CODE BUT ALL DATA TRANSFERS ARE CORRECT. INTERRUPTS ARE
;	TAKEN SO SUSPECT THE PROBLEM IS IN THE CLEANUP CODE.
;164	LEAVE IN ONLY MAP FIX
;163	TAKE OUT MAP FIX LEAVING XHLLI IN AND JRSTF IN
;162	PUT XHLLI BACK IN TAKE OUT JRSTF ONLY IN SEC 0 CODE
;161	XHLLI OUT TO DEBUG ADD RSTF0: TO MAKE TEST FOR JRSTF IN NON
;	0 SECTIONS TEST IN ALL CASES
;157	INSTALL XHLLI MAKE JRSTF UUO ON NON ZERO SECTIONS
;	ALSO MAKE MAP DOING A REFILL PAGE FAIL RIGHT THIS MEANS THAT AFTER
;	CLEAN IT CANNOT DO ANYTHING INTERESTING IF AN INTERRUPT IS PENDING
;	CHANGES AT MAP2:
;156	REINSERT A SKP INTRPT IN THE PAGE FAULT HANDLER TO HAVE INDIRECT
;	POINTER CHAINS INTERRUPTABLE. AT PGRF6:+6
;155	ABORTIVE MAP FIX FIX REMOVED PROBLEM MUST BE FIXED IN HARDWARE.
;154	ADD TESTS FOR AC'S IN PHYSICAL REFERENCES FOR EXAMINES AND DEPOSITS
;	PHYS REFS GO TO MEMORY, NOT AC'S AFTER PROBLEM SHEET 1675
;	CHANGES AT PILD+3 PIFET+2 PSTOR PHYS1 PHYS2 PHYS3
;	ADD CHANGES IN TRACKS TO MAKE MODEL A WORK AT TRK2+2 AND +3
;153	ADD SPECIAL CODE FOR PXCT OF BLT THIS HOPEFULLY CAN GO AWAY
;	WHEN THE EXTENDED ADDRESSING MONITOR DOES NOT USE PXCT ANYMORE
;	IT IS UNDER .IF/BLT.PXCT CONDITIONAL AND COSTS 12 WORDS
;152	CHANGE WHAT BLT DOES TO MATCH THE SPEC SR_BLT(XXX) IS CHANGED TO
;	NOT FORCE GLOBAL ADDRESSING THE LOAD VMA(EA)_ARX+BR AND
;	STORE VMA(EA)_ARX MACROS ARE ADDED TO FORCE THE GLOBAL/LOCAL PARAMETERS
;	TO BE THE SAME AS THOSE OF THE EFFECTIVE ADDRESS
;151	PUT THE EPT AND UPT AT 540 UNDER SWITCH CONTROL .IF/EPT540
;150	VERSION NUMBER BACKED UP TO PRESERVE SPACE IN VERSION NUMBER FIELD
;304	EXTEND 0 WOULD GET A JUMP TO AN UNUSED MICROLOCATION IN MODEL.B
;	ONLY THIS WAS BECAUSE LOCATION 2002: IN MODEL.A SHOULD BE AT 3002:
;	IN MODEL.B 3002: AND 3003: PUT IN WHERE 2002: AND 2003: ARE UNDER
;	CONDITIONALS.
;303	CHANGE THE NUMBER FIELD OF THE SR_BLT(XXX) MACROS TO GIVE THE
;	BIT 0 OFF ALL THE TIME. THIS GIVES BLT MORE THE FORM OF THE OTHER
;	EXTENDED ADDRESSING STUFF IN HOW IT REFERS TO THE SHADOW AC'S.
;	IT IS STILL BELIEVED TO BE BROKEN BUT IS BETTER THAN IT WAS.
;302	ADD LONGER ADDRESS CONSTRAINTS FOR THE NEW MICROASSEMBLER. EVERY
;	LOCATION THAT THE DISPATCH RAM CAN JUMP TO IS EFFECTED. THE
;	CONSTRAINTS THATUSED TO LOOK LIKE =00**** MUST NOW LOOK LIKE
;	=0****00**** THIS IS BECAUSE THE MODEL B MACHINE CAN AND DID
;	REALLY SET THAT BIT. THE CHANGE MAKES THE MICROCODE INCOMPATIBLE
;	WITH THE OLD ASSEMBLER.
;301	HALT IS CLEARING THE RUN FLOP WITH HARDWARE MUST CHECK FOR
;	KERNAL MODE BEFOR THE HALT MACRO SO USER IOT MODE WILL
;	NOT BE ABLE TO HALT. THIS TAKES ONE MICROWORD AT 1017:
;	THE SENSE OF THE SKIP IS REVERSED AGAIN SO 1016: IS BACK TO
;	BEING THE UUO AND CHALT: IS NOW A SEPERATE WORD AFTER 1017:.
;300	REPLACE HALT CODE AGAIN BUT THIS TIME GET THE SENSE OF THE
;	SKIP RIGHT BY SWAPPING THE CONTENTS OF LOCATIONS 1016: AND 1017:
;	PUT THE 1: ADDRESS CONSTRAINT ON CONT:.
;277	PUT HALT BACK THE WAY IT WAS SKP USER HAS THE INVERSE SKIP SENSE
;	AND HENCE DOES THE WRONG THING. HALT TO BE FIXED LATER.
;276	YET ANOTHER TRY AT THE BLKO PROBLEM BLK1: SHOULD HAVE HAD A
;	J/BLK2.
;275	THE LONG PC CHANGES HAD XSFM1: BEFOR THE ADDRESS CONSTRAINT THUS
;	GIVEING THE WRONG ADDRESS. THE =0 IS PUT BEFOR THE LABEL.
;274	FIX THE DIAG.INST CONDITIONALS TO BEHAVE PROPERLY WITH THE
;	CONSTRAINTS OF DRAM LOCATIONS MAP DIED BECAUSE IT NEVER WAS
;	REACHED OUT OF A DISPATCH.
;273	INSERT THE DIAG.INST FEATURE FOR THE DIAGNOSTICS PEOPLE.
;	CHANGES AT DCODE 104:, 106: AND AT XCT: SHOULD NOT EFFECT OTHER
;	ASSEMBLIES.
;272	THE FIX TO THE GARBAGE IN THE LEFT HALF OF VMA IN 265 FORGOT TO
;	LOAD THE VMA IN BLK3:+1 PUT THAT IN. ALSO ON JUD'S RECOMENDATION
;	PUT A COPY OF THE NOP MICROINSTRUCTION AFTER CLRFPD: TO MAKE
;	ENOUGH TIME IN THE SKIP CASE. IT SEEMED TO WORK WITHOUT THIS
;	AND IF SPACE GETS TIGHT IT SOULD BE REMOVED.
;271	FIX IN 267 PGF4:+4 DOES NOT WORK, CANNOT PUT VMA_# THERE. POSSIBLY BECAUSE
;	VMA_# CONFLICTS IN SOME ESOTERIC WAY WITH STORE? THAT CHANGE
;	IS TAKEN OUT AND AT PGF1 THE VMA IS GIVEN 500 OR 501. THIS IS SLIGHTLY
;	LESS DESIREABLE AND FURTHER EFFORT COULD BE SPENT IN THE UCODE TO
;	MAKE PAGE FAILS LESS UNWEILDY FOR THE SOFTWARE ROUTINE THAT CONVERTS
;	THEM TO MODEL B FORM.
;270	CHANGE HALT TO CHECK FOR USER MODE INSTEAD OF IO LEGAL. A JOB
;	IN USER IOT SHOULD NOT BE ABLE TO HALT THE MACHINE.
;267	ADD NEW CONDITIONAL SHIFT.MUUO TO PROVIDE THE SHIFTED DOWN MUUO
;	DATA BLOCKS MORE SIMILAR TO THE XADDR TYPES. CONDITIONAL IS USED
;	AT 1003: AND PGF4:+4 TO PROVIDE A DIFFERENT STARTING ADDRESS.
;266	FIX PILD+3 TO LOAD THE VMA AT THE SAME TIME THUS ENABLING
;	THE MODEL HACK FIX TO LOAD THE LONG VMA.
;265	HAIR UP THE ALREADY HAIRY BLKXX CODE TO CLOBBER THE LEFT HALF OF AR
;	BEFOR USING IT AS AN ADDRESS. CLOBBERED ARL AT BLK2 AND LOADED
;	VMA AT BLK3.
;264	ADD J/CLRFPD AT BFIN TO MAKE IT THE SAME AS IT WAS. BFIN GOT
;	MOVED TO A DIFFERENT PLACE IN THE LAST EDIT AND THIS J FIELD
;	WAS NOT FIXED.
;263	ADD THE MIT FIXES. IOTEND AND THE BLK1 TO BLK4 GROUP ARE CHANGED
;	EXTENSIVELY. CLRFPD IS PUT JUST BEFORE FINI CONSTRAINT ON IOFET
;	IS CHANGED.
;	ADD THE LONG PC FORMAT UNDER A NEW CONDITIONAL LONG.PC THE
;	CONDITIONAL IS TURNED ON BY XADDR. CONDITIONALS ARE ADDED TO THE
;	LONG PC CODE TO MAKE IT SMALLER WHEN ONLY SECTION 0 IS POSSIBLE.
;	ADD COMMENTS TO THE MICROCODE OPTIONS FIELD.
;	RESTORE SXCT CODE FROM VERSION 131. TO BE USED ONLY IN MODEL A
;	NON KLPAGING CODE.
;262	PUT WORD AT INDR1+1 UNDER SXCT CONDITIONAL SO WHEN SXCT IS OFF WE
;	GET AN ADDITIONAL SAVINGS OF ONE WORD.
;261	ADD PHYS REFS AT PGRF6+4 AND PIDISP+4 TO MAKE MODEL.A LOAD A LONG
;	VMA. PART OF THIS CODE IS NOT UNDER CONDITIONAL BECAUSE IT SHOULD NOT MATTER
;	TO A MODEL.B MACHINE. PIDISP+4 ALSO GETS THE LOAD OF THE SAME DATA
;	REPEATED SO THE PHYS REF HAS SOMETHING TO WORK ON.
;	FLUSH THE NOW USELESS CODE AT CHALT TO GENERATE THE LD AR.PHYS
;	CONSTANTS.
;	CURRENTLY THERE IS SORT OF A BUG IN THAT THE SBR AND THE CBR
;	CAN NOT BE ABOVE 256K IN A MODEL.A MACHINE. THIS DOES NOT BOTHER
;	THE CURRENT MONITORS AT ALL IN THAT THESE TABLES ARE IN VERY LOW CORE.
;	IF THAT CHANGES THE LOCATIONS SECIMM+3 SECIMM+7, LDIND, PGRF5, LDSHR
;	AND LDPT1+1 MUST ALL GET FIXED UP. THE GENERAL FIX IS TO GET A PHYS REF
;	IN THE MICROINSTRUCTION THAT LOADS THE VMA. THIS CAN BE DONE BY
;	POSTPONING THE LOAD OF THE VMA ONE MICROINSTRUCTION IN ALL OF THESE
;	PLACES, BUT, SINCE THAT CAUSES A PERFORMANCE DEGRADATION IT WAS NOT
;	DONE.
;260	DIVERGANT CHANGES TO MAKE KLPAGING PHYS REFS THE OLD WAY
;	CAUSE ALL CASES OF VMA_XXX+LD AR.PHYS TO GO BACK TO THE 
;	OLD PHYS REF WAY
;257	IN MODEL B MACHINES AT LDPT+1 THE VMA IS GETTING GARBAGE IN THE
;	LEFT HALF BECAUSE IT ADDED IN JUNK THAT WAS IN AR LEFT. FIX IS TO
;	CLEAR ARL AFTER LDPT AND TO DO THE SHUFFLE PERFORMED THERE ONE
;	MICROINSTRUCTION LATER.
;******	A HACK FIX IS USED HERE THAT TAKES TWO WORDS. THIS WAS DONE BECAUSE
;	OF EXTREEM TIME PRESSURE TO DEBUG >256K MODEL B. THERE OUGHT TO BE
;	A WAY TO REDUCE THIS FIX TO ONLY ONE WORD IN SPACE AND TIME, OR
;	EVEN LESS.
;256	EDIT JUMPED TO RANDOMNESS WITH AN EXTRA RETURN. THIS HAPPENED
;	BECAUSE THERE WAS NO CALL AT EDSFLT IN THE MODEL B NON XADDR CODE
;	ADDED CALL TO EDSFLT.
;255	SAVE EDIT FROM GETTING AN EXTRA STORE CYCLE AT EDSSIG BY SENDING
;	IT ALWAYS TO THE EDFLT1 LOCATION INSTEAD OF EDFLT THIS ONLY
;	CHANGES WHAT HAPPENS IN MODEL B NON XADDR BECAUSE IN MODEL A
;	EDFLT AND EDFLT1 ARE THE SAME LOCATION ANYWAY
;254	CAUSE THE A INDRCT CHANGE IN 253 TO BE ONLY FOR NON EXTENDED
;	ADDRESSING MACHINES. THIS THROWS DOUBT ON THE WORD SAVINGS
;	THAT MIGHT HAVE BEEN POSSIBLE
;253	CHANGE A INDRCT TO LOAD BOTH THE AR AND ARX, IN THE EXTENDED
;	INSTRUCTION SET THIS HAPPENED TO BE DEPENDED ON AT EXT2+2 AND
;	EXT2+3. THE DEFINITION OF A IND IN EA CALC/ WAS FIXED TO
;	LOAD THE AR AND THE ARX
;	I THINK THIS PERMITS THE SAVINGS OF AN EXTRA WORD AND SOME
;	TIME ON ALL INDIRECTS. CHECK OUT FLUSHING INDR1 AND MAKING INDRCT
;	DO THE DISPATCH AND GO TO COMPEA
;	  FORCE ADB TO GENERATE AR*4 AS DEFAULT THIS DISABLES PARITY
;	CHECKING ON THE FM WHEN IT IS NOT BEING READ FIXED IN
;	DEFINITION OF ADB THIS WILL ALSO SPEED UP THE MACHINE BY SOME
;	BECAUSE THE ADB FIELD CAN NO LONGER FORCE 3 TICS WITHOUT REALLY
;	NEEDING THAT LONG
;252	SAVE A WORD AT IOPGF+1 BY MAKING IT PILD+3 THIS ADDS THE SET
;	ACCOUNT ENABLE TO AN UNDEFINED CASE.
;251	TURNING ON PAGING CAUSED A HANG THIS WAS BECAUSE OF A MISIMPLIMENTED
;	FIX IN 250. THE ATTEMPT TO PUT THAT FIX IN NO SPACE FAILED AND IT TOOK
;	ONE WORD. AT LDPT+1 ADD BR/AR AT GTCST1 RECOVER THE AR FROM THE BR
;	THIS SEEMS LIKE IT SHOULD BE ABLE TO BE BUMMED BUT I CANNOT
;	FIGURE OUT HOW
;	ALSO FIX A PLACE WHERE A PHYS REF WAS LEFT IN THE MODEL A CODE
;	AT PGRF6+4 MODEL B CONDITIONAL IS AS IT WAS MODEL A IS NEW TO USE
;	LD AR.PHYS MECHANISM
;250	LOADING HIGH ORDER GARBAGE TO THE VMA WITH THE FIX FOR
;	>256K CAUSES FUNNY THINGS TO HAPPEN. BITS GET CLOBBERED
;	WITH AR0-8_SCAD 14 LINES AFTER SECIMM. ACTUALLY IS MORE
;	HAIR BECAUSE OF CONFLICTING FIELDS. CODE ABOVE AND BELOW
;	THAT GOT REARRANGED TO SIMPLER MODEL A AND MODEL B CONDITIONALS
;	SINCE NOW ALL LINES ARE DIFFERENT. SHUFFLING OF FE IS DONE
;	TO PROVIDE ROOM FOR A CONSTANT ON THE CORRECT SIDE OF THE SCAD
;	AT LDPT A SIMILAR
;	RECODING IS NEEDED. 4 LINES OF CODE ARE REDONE IN MODEL
;	A CONDITIONAL AND CONDITIONALS ARE RESHUFFLED TO HAVE
;	SIMPLER FORMAT
;	NEW MACROS ARE ADDED GEN AR0-8, GEN FE AND AR0-8
;	VMA_AR+LD AR.PHYS AND ITS FRIENDS ARE TAKEN OUT OF KLPAGING
;	CONDITIONAL THEY ARE USED TO DO EXAMINES AND DEPOSITS NOW
;247	FIX ST AR.PHYS TO GIVE BIT 4 INSTEAD OF BIT 5 AT CHALT
;	AT PSTORE CHECK FOR AC REF AND IF SO WRITE FM MUST DO THIS
;	BECAUSE LOAD AD FUNC DOES NOT SET MCL STORE AR
;246	FIX MUUO, IN EXTENDED ADDRESSING, TO GET NEW PC BEFORE CLOBBERING
;	THE USER AND PUBLIC FLAGS THAT TELL WHERE TO GET IT.  FIX CONDITIONAL
;	ASSEMBLY AT INDRCT TO DO EA TYPE DISP IN MODEL A, NOT MODEL B.
;245	ADDITIONAL FIXES FOR THE 256K PROBLEM, TO MAKE EXAMINE AND
;	DEPOSIT WORK.  CHANGES AT CHALT TO CREATE CONSTANT "ST AR.PHYS",
;	AND EXTENSIVELY NEAR PICYC1, PIDATI, AND PIDATO.  CHANGES ARE ALL
;	UNDER MODEL B CONDITIONAL, BECAUSE MODEL B HARDWARE WORKS OK, AND
;	THE FIX IS REGARDED AS CROCKISH.
;244	WAIT FOR COMPLETION OF INDIRECT REFERENCE AT BYTEI+1 AND EXTI+1
;	EVEN THOUGH INTERRUPT REQUEST HAS BEEN SEEN, SO AS NOT TO CONFUSE MBOX.
;243	VARIOUS FIXES TO MAKE THESE SOURCES WITH MODEL.B SWITCH OFF
;	EQUIVALENT TO MODEL A SOURCES, SO WE CAN DISCARD MODEL A SOURCES
;	THE FIXES ARE:
;		1) SWITCH SNORM.OPT, TO SAVE SPACE IN SINGLE PRECISION
;		FLOATING NORMALIZATION.
;		2) CREATION OF LD AR.PHYS MAGIC CONSTANT, TO SOLVE HARDWARE
;		PROBLEMS GENERATING ADDRESSES ABOVE 256K.
;242	FIX AT SECPTR+1 TO PRESERVE AR LEFT UNTIL WE CAN CHECK
;	FOR BITS 12-17 NON ZERO CORRECT ADDRESS CONSTRAINTS AT
;	SECIMM+1 & +2 TO GET BRANCHING RIGHT FOR SHARED AND INDIRECT
;	SECTION POINTERS.  FIX AT LDIMM+1 TO CLEAR LH OF AR BEFORE
;	LOADING VMA WITH SPT ADDRESS, TO PREVENT PAGE FAULT ON SPT
;	REFERENCE.
;241	MORE FIXES AT START: AND NEWPC:, FOR SAME PROBLEM AS 240.
;	MUST LOAD FLAGS AND CLEAR VMAX, THEN LOAD VMA INTO PC TO CLEAR
;	PCX, THEN RELOAD VMA TO GET EFFECT OF NEW FLAGS AND CLEARED
;	PCX.  (MODEL A ONLY).
;240	FIXES AT START: AND NEWPC: TO LOAD 23-BIT ADDRESS RATHER
;	THAN 30-BIT, SINCE OTHER BITS ARE PC FLAGS.  AT SAME TIME AND
;	PLACE, FIX MODEL A CODE TO CLEAR PC SECTION NUMBER.
;237	CHANGE CONDITIONALS AROUND PUSH AND POP CODE FROM XADDR TO
;	MODEL.B. COULD SIMPLIFY IFNOT XADDR.
;236	FIX ADDRESS CONSTRAINTS ON USES OF EA MOD DISP IN MODEL
;	B MACHINE WITH EXTENDED ADDRESSING OFF.  PROBLEMS AT COMPEA,
;	BFETCH, AND EXT2.
;235	SLIGHTLY CLEANER FIXES FOR PROBLEMS IN 234 TO AVOID WASTING TIME
;	AND SPACE.  BYTE READ MACRO NEEDS TO SET VMA/LOAD, AND VMA_VMA
;	HELD MACRO DOESN'T USE MEM FIELD UNLESS MODEL B AND KL PAGING.
;	ALSO FIX CONDITIONAL ASSEMBLY STUFF TO AVOID SPURIOUS ERRORS.
;234	INSTALL FIXES FOR SOME PLACES WHERE MODEL B CODE CAUSES CONFLICT
;	WITH THE OLD NON KLPAGING NON EXTENDED ADDRESSING CODE
;	THESE ARE AT BFETCH, PGF3-1, PGF6, EXT1+2
;233	FIX THE FOLLOWING PROBLEMS:
;		KL PAGING SHOULD PRODUCE A PAGE FAILURE WHEN BITS
;		 12-17 OF A PRIVATE SECTION POINTER ARE NON 0
;		 FIXED AT SECPTR ETC.
;		EDIT DOES NOT ALLOW INTERUPTS
;		 FIXED AT EDNXT1 AND AFTER THAT
;		MAP SHOULD NOT BE LEGAL IN USER MODE
;		 FIXED AT MAP2 AND CLEAN+15
;		MOVMI IS SHORTENED BY MAKING IT THE SAME AS MOVEI
;		 AT DON LEWINES SUGGESTION THIS IS IN DCODE 215
;232	MERGE THE SECOND ORDER STATISTICS GATHERING CODE WITH THIS
;	CODE INTENT IS TO KEEP IT HERE
;231	CHANGE THE LOAD CCA DEFINITION TO REFLECT THE NEW HARDWARE
;	THIS IS ENABLED WHEN THE MODEL.B ASSEMBLY SWITCH IS ON
;230	THIS IS THE POINT WHERE MICHAEL NEWMAN TAKES OVER THE MICROCODE
;	MAINTENCE SEVERAL BUG FIXES GET EDITED INTO 126 AT THIS POINT
;	TWO SETS OF PARALLEL CODE WILL BE MAINTAINED FOR A WHILE.
;	FIX THE CMPS PARODY ERROR PROBLEM WHEN ILLEGAL BITS ARE FOUND IN
;	THE LENGTHS.
;227	FIX PIBYTE TO GET DTE# CORRECT ON TO-10 TRANSFERS.  FIX MTRREQ
;	CYCLES TO WAIT FOR STORE TO FINISH BEFORE RE-ENABLING ACCOUNT.
;	FIX ADJSP OF LONG STACK POINTERS TO FETCH NEXT INSTR.
;226	FIX EXMD TO LOAD AR, RATHER THAN ARX, WITH MARK POINTER, AS
;	EXPECTED BY THE HANDLER.  FIX EDIT, SEVERAL PLACES, TO IGNORE
;	LEFT HALF OF MARK & PATTERN ADDRESSES WHEN PC SECTION IS ZERO.
;	FIX EDIT TO MAKE EXTENDED REFERENCE FOR PATTERN BYTES.
;	FIX ADJSP TO BE MEANINGFUL WITH LONG STACK POINTERS
;225	FIX BYTEA NOT TO CLOBBER FE ON INDIRECTS, FIX EXMD TO BACK
;	UP VMA AFTER STORING DSTP2 AND BEFORE STORING DSTP.  FIX EDIT TO
;	COUNT THE WHOLE PATTERN ADDRESS IF PC SECTION NOT ZERO.
;224	FIX EXTEND ADDRESS CALCULATION TO RECOVER E0 FROM MQ, AND
;	FIX EXTEND OPCODE TEST TO DISALLOW OPS >20.
;	FIXES TO HANDLE NEW ENCODING OF AC-OP ON APR BOARD.
;223	COMPLETE 222.  P HAS TO GO TO SC AS WELL AS AR0-5.  CREATE
;	SUBROUTINE RESETP TO DO IT.  GET CODE IN SYNC WITH HARDWARE AND
;	MOST RECENT SPEC FOR MEANING OF PXCT AC BITS IN EXTEND.  THUS
;	UNDO COMMENT IN 221:  WE SHOULD LOOK AT PXCT B11.  ALSO FIX
;	EXTEND TO USE CORRECT ENCODING OF BITS 9, 11, AND 12 FOR PXCT
;	OF STRING OPERATIONS.  FIX DATAI PAG SO IT DOESN'T LOSE THE
;	PREVIOUS CONTEXT AC BLOCK WHEN LOADING PREVIOUS SECTION #.
;	INSERT CHANGE CLAIMED FOR EDIT 55, TO INHIBIT INTERRUPT DURING
;	PI CYCLES.
;222	FIX BYTE POINTER UPDATE ROUTINES GSRC & IDST IN EIS CODE
;	TO UPDATE P WHEN INCREMENTING SECOND WORD.  JUST FORGOT TO. TRY
;	AGAIN TO CONTROL EIS REFERENCES OFF E0, FOR EXTENDED OR NOT.
;221	COMPLETE FIX OF 220, TO KEEP SR CORRECT THROUGH RELOAD OF IR
;	IN EXTEND DECODING, AND TO CONTROL SR CORRECTLY FOR XBLT DST
;	REFERENCES.  (WE WERE LOOKING AT PXCT B11, SHOULD BE B12).
;220	FIXES SEVERAL PLACES TO USE "EA" IN DRAM A FIELD INSTEAD OF "I",
;	NOTABLY BLT, WHICH WAS USING WRONG SECTION.  FIX EXTEND TO
;	CONTROL VMA EXTENDED BEFORE FETCHING EXTEND-OP, SO AS NOT TO
;	LOOK "UNDER" THE AC'S.  FIX XBLT FOREWARD TO STOP WHEN AC GOES
;	TO ZERO, NOT -1.  ALSO CONTROL SR BEFORE INITIAL STORE TO GET
;	CORRECT CONTEXT.
;217	CODE CHANGES TO MAKE SECOND WORD OF BYTE POINTER WORK RIGHT
;	WHETHER EFIW OR IFIW, BY CONTROLLING CRY18 OR CRY6.
;216	RECODE EXTENDED INSTRUCTION SET DECODING & EFFECTIVE ADDRESS
;	CALCULATION.  FIX UUO CODE TO INCREMENT VMA AFTER STORING PC.
;	FIX ADJBP TO GET 36 BIT ADDRESS ADJUSTMENT IF B12 SET.
;215	REARRANGE CONDITIONAL ASSEMBLY DEFAULTS TO BE MORE LOGICAL
;	INSERT FORM FEEDS AND COMMENTS TO HELP BEAUTIFY THE LISTING.
;	REWORK THE NEW JRST'S, TO MAKE THEM SMALLER, FASTER, AND TEST
;	IO LEGAL BEFORE DISMISSING.  PUT IN XBLT.
;214	MODIFY ADJBP AND UUO'S FOR EXTENDED ADDRESSING. REWORK PARITY
;	ERROR HANDLING, IN A FRUITLESS ATTEMPT TO MAKE IT SMALLER,
;	BUT SUCCESSFULLY MAKING IT CLEARER.  FIX ASSEMBLY ERRORS IN EIS
;	DUE TO AC4 CHANGES, AND ADD CODE TO HANDLE LONG BYTE POINTERS
;	IN AC'S.  PUT IN CODE TO GIVE PAGE FAIL 24 ON ILLEGAL FORMAT
;	INDIRECT WORD.
;213	FIX LDB & DPB TO TEST POINTER BIT 12 ON CALL TO BYTEA.
;212	MODIFY JSP, JSR TO STORE FULL PC WITHOUT FLAGS IN NON-ZERO SEC
;	SEPARATE CONDITIONALS FOR "MODEL B" MACHINE FROM THOSE FOR
;	EXTENDED ADDRESSING MICROCODE.
;211	REMOVE UNNECESSARY DIDDLING OF VMA USER BIT DURING PAGE REFILL,
;	AND ELIMINATE SPECIAL CASE FOR MAP INSTRUCTION, WHEN EXTENDED
;	ADDRESSING HARDWARE EXISTS TO SOLVE THESE PROBLEMS.
;	FIX SEVERAL CASES OF SIGNS DISP WITH INADEQUATE CONSTRAINT.
;210	FIX DEFINITION OF "SKP LOCAL AC REF", WHICH CONFUSED "AC
;	REF" WITH "LOCAL AC REF".
;207	FIX JRSTF (AND ITS DERIVATIVES) TO LOAD FLAGS INTO AR AFTER
;	DOING EA MOD DISP, WHICH WOULD OTHERWISE CLOBBER THEM.  FIX
;	COMPEA CODE TO LET AREAD HARDWARE LOAD AR.  OTHERWISE GET SEC #.
;206	FIX PCTXT ROUTINE TO GET PREVIOUS CONTEXT SECTION.
;205	FIX POPJ TO LOAD HALFWORD OR FULLWORD PC ACCORDING TO PC SECT
;204	FIX CONDITIONALS AROUND LOC 47, WRONG IN 202.  FIX DEFINITION
;	OF A INDRCT, DOESN'T NEED #07.  FIX STACK INSTRUCTIONS FOR
;	EXTENDED ADDRESSING.  MUST NOT LOAD VMA FROM FULL AD.
;203	INCLUDE CODE AT NEXT+2 TO GENERATE ADDRESS MASK (LOW 23 BITS)
;	AT HALT TIME, AND CODE IN PICYCLE TO USE IT TO GET 23 BIT ADDR
;	OUT OF IOP FUNCTION WORD.
;202	MOVE "40+A" LOCATIONS TO "A" UNDER EXTENDED ADDRESSING.  CHANGE
;	ALL CALL MACROS TO GENERATE CALL BIT INSTEAD OF SPECIAL FUNC'S.
;201	BEGIN EXTENDED ADDRESSING CHANGES IN EARNEST.  INTEGRATE NEW
;	EFFECTIVE ADDRESS COMPUTATION CODE, AND REVISE INSTRUCTION
;	ROUTINES AS NECESSARY.
;126	FIX STRAC3-2, WHERE COMMA GOT LEFT OFF WHEN IFETCH MOVED
;125	REMOVE NXT INSTR FROM STAC1, STRAC3, & STAC4, MAKING THEM JUMP
;	TO FINI INSTEAD.  PROBLEM INVOLVES A RACE IF PAGE FAIL OCCURS
;	WHILE WRITING FM.  IF FM ADDRESS CHANGES BEFORE COND/FM WRITE
;	GOES FALSE, APR BOARD MAY GRONK PARITY BIT OF SOME FM LOC'N.
;	THIS RESULTS IN SOME SOME PATHS FROM FETCH TO NICOND BECOMING
;	LONGER THAN 6 TICKS, SO THE FETCHES GOT SHUFFLED IN SOME PLACES.
;	MICROCODE PATCH ELIMINATES MOST PROBABLE CAUSE, WHICH IS PAGE
;	FAIL AT NICOND TIME WHILE WRITING AC OTHER THAN 0.  IT DOES NOT
;	TAKE CARE OF THE POSSIBILITY THAT COND/FM WRITE WILL GLITCH AT
;	INSTR 1777 TIME.
;124	FIXES IN SEVERAL PLACES TO SET AND CLEAR ACCOUNT ENABLE SO AS
;	TO GET REPEATABLE ACCOUNTING MEASURES OF USEFUL WORK DONE. THE
;	ENABLE IS NOW CLEARED FOR METER UPDATE CYCLES AND KL PAGE REFILL
;	CYCLES.  THE HARDWARE ALREADY TAKES CARE OF PI CYCLES.
;123	CORRECT 122 TO CONSTRAIN LOC "UNHALT", AND TO LOAD ARX FROM AR,
;	SO AS TO LET "SKP AR EQ" WORK.  PROBLEM AROSE BECAUSE MACRO ALSO
;	TESTS ARX00-01.  FIX EDIT, WHEN STORING DEST POINTER ON SELECT
;	SIGNIFICANCE START, TO ELIMINATE AMBIGUITY IN DEST P FIELD.
;122	SPEC CHANGE TO EXIT FROM HALT LOOP, SO THAT AR0-8=0 WITH AR9-35
;	NON-ZERO LOADS AR INTO PC TO START PROCESSOR.  THIS IS DIFFERENT
;	FROM EXECUTING JRST BECAUSE PC FLAGS ARE CLEARED.
;121	FIX TO 120 TO ALLOW A CYCLE BETWEEN FILLER FROM MEMORY AND
;	WRITING IT INTO FM (THUS PARITY CAN BE COMPUTED).  ALSO CLEAR
;	STATE REGISTER IN EDIT BEFORE GETTING NEXT PATTERN BYTE.
;120	FIX EIS TO TOLERATE PAGE FAIL ON READ OF FILL BYTE IN MOVSRJ
;	OR B2D CONVERSION.  REQUIRES GETTING FILLER BEFORE STORING DLEN
;	ALSO INTEGRATE OPCODE COUNTING/TIMING CODE UNDER CONDITIONALS
;117	FIX PARITY ERROR CODE TO WRITEBACK AR ON RPW ERROR.
;116	REWRITE OF DDIV, SO THAT THE NO-DIVIDE TEST IS ON THE MOST
;	SIGNIFICANT HALF OF THE MAGNITUDE OF THE DIVIDEND, RATHER THAN
;	THE MAGNITUDE OF THE MOST SIGNIFICANT HALF.  IN THE PROCESS,
;	SAVE TIME AND SPACE.  ALSO PUT IN CONDITIONAL ASSEMBLY VARIABLE
;	"WRTST" TO INHIBIT WRITE TEST CYCLE FOR INSTRUCTIONS WHICH
;	APPEAR NOT TO NEED IT, AND THUS TO SPEED THEM UP.
;115	FIX SBDIAG TO SET MCL REG FUNC TO INHIBIT EBOX MAY BE PAGED.
;114	RECODE STRING COMPARE TO SAVE SPACE AND TIME.  CHANGE DEFAULTS
;	FOR KLPAGING TO INCLUDE EIS, EXCLUDE TRACKS FEATURE.  CHANGE
;	KLPAGING (NEW SPEC) TO KEEP "LOGICALLY WRITABLE" IN SOFTWARE BIT
;113	RECODE KL PAGING TO ELIMINATE PROBLEM OF WRITING HARDWARE
;	PAGE TABLE BEFORE CHECKING FOR AGE TRAP, AND THEREFORE LEAVING
;	THE PAGE ACCESSIBLE AFTER THE TRAP.  THE RECODING ALSO IMPROVES
;	THE ALGORITHM IN THAT THE HARDWARE ENTRY INCLUDES THE W BIT SET
;	IF THE CORE TABLES ALLOWED WRITE AND THE CST INDICATES WRITTEN,
;	EVEN IF THE CURRENT REFERENCE WAS NOT A WRITE.
;	ALSO FIX CODE WHICH WRITES PT DIR, TO GET WRITE REF BIT FROM
;	VMA HELD INTO BIT 5 OF SAVED PAGE FAIL WORD.
;112	FIX PAGE FAIL CODE FOR USE WITH PROB SHEET 1396, WHICH LOADS
;	PC IF PAGE FAIL OCCURS ON NICOND.  THUS CODE NEEDN'T CHECK FOR
;	FETCH AT CLEAN, WHICH CAUSED OTHER PROBLEMS ON PARITY ERRORS.
;	CLEAR FE AND SC IN NXT INSTR MACRO (JUST CLEANLINESS).
;111	PATCH SEVERAL ROUTINES WITH THE FOLLOWING MACRO --
;	FETCH WAIT	"MEM/MB WAIT"
;	TO PREVENT SEQUENCES IN WHICH PAGE FAIL INFO CAN GET LOST
;	BECAUSE OF LONG TIME FROM REQUEST TO MB WAIT.  THESE PATCHES
;	SHOULD BE REMOVED AFTER AN ECO HAS BEEN INSTALLED TO FIX.
;	IN ADDITION, EBUSX SUBROUTINE HAS BEEN MODIFIED TO PREVENT RACE
;	CONDITION WHEN SETTING UP IO FUNCTION WITH COND/EBUS CTL AND
;	MAGIC # BIT 4.  MUST NOT CHANGE #5 THROUGH #8 ON NEXT CYCLE.
;	FIX KLPAGING CODE TO GO BACK TO AREAD ON MAP REF, BECAUSE
;	MEM/AD FUNC DOESN'T CORRECTLY RESTORE APR REG FUNC.  ALSO MAKE
;	THE CODE SMARTER ON NO MATCH CONDITION, SO REQUEST DOESN'T HAVE
;	TO BE RESTARTED AND IMMEDIATELY FAIL AGAIN.
;110	GIVE UP ON THE OLD STRING COMPARE CODE, INSTALLING MIKE NEWMAN'S
;	VERSION.  SOMEWHAT SLOWER, BUT GIVES THE RIGHT ANSWERS.
;	FIX LDB CODE TO WAIT FOR MEM WORD EVEN IF INTERRUPT REQUEST
;	SEEN, SO AS NOT TO GET CONFUSED WHEN IT ARRIVES OR PAGE FAILS.
;	ALSO IMPROVE CLRPT ROUTINE USED BY CONO AND DATAO PAG TO START
;	LOOP WITH VMA CLEARED AND PT WR SELECTION SETUP CORRECTLY.
;107	FIX STRING COMPARES TO CHECK FOR INTERRUPT.  THIS INVOLVED
;	CHECKING DURING GSRC ROUTINE, WHICH ELIMINATES NEED FOR CHECK
;	IN SRCMOD (WHICH CALLS GSRC).  IT ALSO REQUIRED CLEARING SFLGS
;	AT STARTUP, AND ADJUSTING DLEN UPDATE CODE IN DEST FILL TO GET
;	VALID LENGTH STORED ON INTERRUPT.
;106	ELIMINATE RACE IN DECODING OF # FIELD ON MTR BOARD BY HOLDING
;	LOW 3 BITS THROUGH NEXT MICROINSTRUCTION.
;	FIX LUUO AND MUUO TO ALLOW INTERRUPTS.
;	FIX B2D OFFSET TO SIGN-EXTEND E1 AFTER INTERRUPT.  FINISH 105,
;	TO GET ENTIRE AR LOADED WHILE CLEARING MQ (ARL WAS HOLDING).
;	FIX KL PAGING TO USE VMA/1 INSTEAD OF VMA/AD WHEN RESTORING VMA
;	FROM VMA HELD OR COPIES THEREOF.
;	FIX UFA NOT TO ALWAYS GET UNDERFLOW ON NEGATIVE RESULTS.
;	SAME FIX AS EDIT 103 OF BREADBOARD.  WHERE DID IT GET LOST?
;105	FIX KL PAGING AS REVISED BY EDIT 103 TO CORRECTLY RESTORE
;	BR ON NO-MATCH CONDITION
;	ANOTHER FIX TO B2D, TO CLEAR MQ ON ENTRY.  BUG INVOLVED GARBAGE
;	FROM MQ SHIFTING INTO ARX DURING DEVELOPMENT OF POWER OF TEN.
;104	FIX BINARY TO DECIMAL CONVERSION, WHICH WAS NOT GOING TO CLEAN
;	ON FINDING AN INTERRUPT, AND ON RESTART WITH FPD SET, WAS NOT
;	SETTING UP SLEN.  TSK, TSK.  CORRECT CLEANUP FOR DEST FILL IN
;	MOVSRJ, WHICH WAS INCREMENTING BOTH SLEN AND DLEN, SHOULD
;	HAVE BEEN NEITHER.  FIX JSR, BROKEN BY EDIT 103.  JUMP MUST BE
;	TO E+1, NOT E.
;103	CREATE CONDITIONAL ASSEMBLY FOR EXTENDED ADDRESSING. UNDER IT,
;	CREATE MEM FIELD DEFINITIONS, SUPPRESS SXCT.
;	SAVE A WORD IN JSR BY USING JSTAC IN COMMON WITH PUSHJ.
;	FORCE TIME FIELD IN CASES WHERE ASSEMBLER DEFAULT SCREWS UP.
;	ADD INTERRUPT TESTS IN KL PAGING CODE TO PREVENT HANGS, AND
;	REVISE PAGE FAIL WORD TO ELIMINATE THE NEW FAIL CODES.
;102	ATTEMPT ANOTHER FIX OF MOVSRJ, CVTBDX FILL.  EDIT 71 LOSES
;	DUE TO INCONSISTENCY -- DLEN UPDATE MUST NOT PRECEED CLEANUP.
;	CREATE CONDITIONAL ASSEMBLY SWITCHES TO CONTROL EXTENDED
;	INSTRUCTION SET, DOUBLE INTEGER ARITHMETIC, AND ADJBP.  CHANGE
;	DEFAULT OF IMULI.OPT, WHICH CAN GET SIGN WRONG ON OVERFLOW.
;101	FIX METER REQUEST CODE TO "ABORT INSTR" EVEN IF NOT SETTING
;	PI CYCLE.  THIS SHOULD FIX OCCASIONAL LOSS OF TRAPS PROBLEM.
;100	FIXES TO KL PAGING CODE TO PREVENT LOADING VMA FROM AD WHILE
;	REQUESTING PHYSICAL REF.  FIX JSR TO PREVENT FM PARITY STOP
;	ON STORE TO AC.  FIX 1777 TO FORCE RECIRCULATION OF AR/ARX,
;	EVEN IF MBOX RESP STILL TRUE.
;77	FIX DDIV TO GET MQ SHIFTED LEFT ONE PLACE, WITHOUT INTRODUCING
;	AN EXTRA BIT, AT DDVX1.  THIS INVOLVES INHIBITING ADA TO PREVENT
;	AD CRY0 FROM COMMING INTO MQ35.
;76	FIX UFA TO ALLOW AN EBOX CYCLE BETWEEN FETCH AND NICOND WHEN
;	FRACTION SUM IS ZERO, AT UFA3.
;75	PUT BACK INSTRUCTION "MBREL" REMOVED BY EDIT 64.  NECESSARY TO
;	ENSURE THAT EBOX REQUEST FOR FETCH DOESN'T COME UP WHILE
;	REGISTER FUNCTION IS IN PROGRESS, WHICH WOULD CONFUSE MBOX ON
;	STARTING THE FETCH.
;74	CHANGES TO EIS FOR NEW-SPEC AC USAGE.  CHANGES TO KL PAGING FOR
;	INDIRECT, IMMEDIATE SECTION POINTERS
;73	FIX JRA TO PREVENT WRITING AC WITH DATA FRESH FROM MEMORY (ALLOW
;	A CYCLE FOR PARITY CHECK).  FIX DPB CODE TAKE ONLY 3 TICKS ON
;	RETURN FROM BYTEA, SO THAT CACHE DATA DOESN'T ARRIVE INTO AR
;	AND ARX UNTIL DPB1, WHEN THE BYTE HAS GOTTEN OUT TO MQ.
;72	FIX DEFINITION OF SP MEM/UNPAGED TO INHIBIT VMA USER.  FIX
;	PAGE FAIL CODE TO CHECK FOR VMA FETCH BEFORE LOOKING AT
;	INTERRUPT REQUEST.  PROBLEM WAS INTERRUPT CONCURRENT WITH
;	PAGE FAIL ON JRSTF TO USER.  PC FLAGS GOT RESTORED, BUT VMA
;	NEVER COPIED TO PC BECAUSE PAGE FAIL INHIBITED NICOND, AND
;	INTERRUPT ABORTED PAGE FAIL HANDLING TO LOAD PC.
;71	DEFINE FMADR/AC4=6.  FIX MOVFIL ROUTINE TO PUT AWAY UPDATED
;	LENGTH DIFFERENCE WHEN INTERRUPTED, THUS AVOIDING RANDOMNESS
;	IN MOVSRJ, CVTBDX. FIX CVTBD CALL TO MOVFIL TO PRESERVE SR.
;	CHANGE STMAC AND PIDONE FROM "FIN XFER" TO "FIN STORE", BECAUSE
;	STORE WAS IN PROGRESS, WHICH CAUSED FM WRITE IF AC REF, AND
;	GOT A PARITY ERROR DUE TO ADB/FM.
;70	FIX PXCT 4,[POP ...], WHICH DIDN'T GET DEST CONTEXT SET FOR
;	STORE.  MUST USE SR_100 TO SET IT.
;67	FIX PROBLEM IN ADJBP BY WHICH BYTES/WORD WAS GETTING LOST
;	WHEN DIVIDE ROUTINE LOADED REMAINDER INTO BR.  SOLVED BY
;	SAVING BYTES/WORD IN T1.
;66	FIX KL PAGING TO RESTORE VMA ON TRAP, SAVE ADDRESS OF POINTER
;	CAUSING TRAP, AND NOT RESTORE ARX EXCEPT FOR BLT PAGE FAIL.
;	ALSO SET TIME PARAMETER ON ADB/FM TO ALLOW TIME FOR PARITY
;	CHECKING OF FM.
;65	FIX KL PAGING CODE TO DO MBWAIT AFTER DETERMINING THAT PARITY
;	ERROR HAS NOT OCCURRED, SO AS TO GET CORRECT VMA TO SAVE.
;	CREATE SYMBOLS FOR KL PAGE FAIL CODES.  PUT CONDITIONAL
;	ASSEMBLY AROUND IMULI OPTIMIZATION CODE, AND SXCT.  CREATE
;	SYMBOL "OPTIONS" IN # FIELD FOR MICROCODE OPTIONS.
;64	MICROCODE FOR KL10 PAGING (PAGE REFILL, MAP INSTR)...
;	REMOVE UNNECESSARY INSTRUCTION MBREL: FROM SWEEP AND APRBO
;	COSMETIC CHANGES TO KEEP COMMENTS & MACRO DEFINITIONS FROM
;	OVERFLOWING LINE OF LISTING, AND INSERTION OF CONDITIONAL
;	ASSEMBLY CONTROL OF LONG FLOATING POINT INSTRUCTIONS.
;63	IN MTR REQUEST ROUTINE, DON'T DISMISS WHEN PI CYCLE HASN'T
;	BEEN SET.
;62	FIX RDMTR CODE TO PUT 35 IN SC BEFORE GOING TO DMOVEM CODE.
;61	FIX PIIBP ROUTINE TO USE CALL.M INSTEAD OF SPEC/CALL,
;	WHICH GETS OVERRIDDEN BY P_P-S... IN MTR REQUEST SERVICE
;	ROUTINE, DON'T SET PI CYCLE UNLESS REQUEST IS FOR VECTOR.
;60	FIX DATAO PAG TO DO MB WAIT AFTER STORING EBOX ACCT AND
;	BEFORE CHANGING VMA.
;57	RE-CODE USES OF A@, B@ TO USE VMA/1, RATHER THAN VMA/AD,
;	IN ORDER TO GET CORRECT CONTEXT ON INDIRECT WORD. SEE MCL4
;56	FIX SECOND PART OF PICYCLE (TAG NEXT:) TO ENSURE THAT
;	PC+1 INH, KERNEL CYCLE, ETC REMAIN UP DURING 2ND PART.
;	ALSO CHANGE SPEC/FLAG CTL FOR ECO 1261, WHICH REQUIRES
;	#07 TO BE OPPOSITE OF #04 TO GENERATE SCD LEAVE USER.
;55	FIX SPEC INSTR/SET PI CYCLE TO INHIBIT INTERRUPTS
;	(IN PARTICULAR, METER UPDATE REQUESTS).  MAKE SURE VALID
;	DATA SAVED ON IO PAGE FAIL AND PARITY ERRORS. REMOVE
;	BACKWARDS BLT... IT BROKE TOO MANY PROGRAMS.
;54	FIX OVERFLOW CHECK IN IMULI OPTIMIZATION TO INH CRY 18
;	UPDATE TO USE CONDITIONAL ASSEMBLY IN MICRO VERS 20.
;53	FIX T1,T2 PARAMETERS ON BYTE DISP, SIGNS DISP
;52	CORRECT SHIFT AMOUNT FOR IMULI OPTIMIZATION, AND FIX MACRO
;	DEFINITIONS FOR SET SR?, WHICH WERE ALWAYS SETTING SR0.
;51	OPTIMIZE IMULI OF TWO POSITIVE OPERANDS (TO SPEED UP SUBSCRIPT
;	CALCULATIONS) BY TAKING ONLY 9 MULTIPLY STEPS AND STARTING
;	NEXT INSTRUCTION FETCH EARLIER.  OPTIMIZATION CAN BE REMOVED
;	BY COMMENTING OUT TWO INSTRUCTIONS AT IMULI, AND ONE FOLLOWING
;	IMUL.  ALSO FIX APRBI/UVERS TO KEEP SERIAL # OUT OF LH.
;50	INTRODUCE SKIP/FETCH AND CODE IN PAGE FAIL RECOVERY TO LOAD
;	PC FROM VMA IF PAGE FAIL OCCURED ON FETCH, BECAUSE NICOND
;	CYCLE, WHICH SHOULD HAVE LOADED PC, GETS INHIBITED BY INSTR 1777
;	ALSO INCLUDE EXTENDED INSTRUCTION SET.
;47	UNDO XCT CHANGES OF EDIT 46, WHICH BROKE XCT DUE TO INSUFFICIENT
;	TIME FOR DRAM HOLD BEFORE USING "A READ". ALSO FIX VECTOR
;	INTERRUPT CODE TO LOOK AT CORRECT BITS FOR CONTROLLER NUMBER.
;46	FOLLOW-ON TO EDIT 45, SAVING 2 WORDS AND A CYCLE
;	ALSO MOVE JRST TO 600, JFCL TO 700, UUO'S TO 100X AS PREPARATION
;	FOR EXTENDED INSTRUCTION SET
;45	FIX SXCT TO LOOK AT AC FIELD OF SXCT, NOT SUBJECT INSTRUCTION,
;	WHEN DECIDING WHETHER TO USE BASE-TYPE ADDRESS CALCULATION.
;44	FIX PAGE FAIL LOGIC TO WORK FOR EITHER PAGE FAIL OR PARITY
;	ERROR.  EDITS 42 AND 43 BOTH WRONG.  ALSO CORRECT RACE IN
;	WRITING PERFORMANCE ANALYSIS ENABLES TO PREVENT SPURIOUS COUNTS.
;43	CORRECT USE OF PF DISP BY EDIT 42.  LOW BITS ARE INVERTED
;42	FIX BUGS INTRODUCED BY EDIT 40, WHICH MADE FLTR OF 1B0 HANG
;	TRYING TO NEGATE IT, AND FIX UP EXPONENT CORRECTION ON LONG
;	SHIFT LEFT.  ALSO PUT IN CODE TO HANDLE PARITY ERROR PAGE
;	FAILURES, AND SET TIME CONTROLS ON 43-47.
;41	REWRITE OF VECTOR INTERRUPT PROCESSING TO MAKE DTE VECTORS
;	GO TO 142+8N, WHERE N IS DTE#.  RH20 GO TO PROGRAMMED ADDRESS
;	IN EPT, EXTERNAL DEVICES USE EXEC VIRTUAL ADDRESSES.
;40	IMPROVEMENTS TO FLOATING NORMALIZATION TO MAKE LONG SHIFTS
;	FASTER, PRIMARILY TO HELP FLTR
;37	FIX FLOATING DIVIDE SO THAT THE TRUNCATED FORM OF A NEGATIVE
;	QUOTIENT IS EQUAL TO THE HIGH-ORDER PART OF THE INFINITE-
;	PRECISION QUOTIENT.  SEE COMMENTS IN THE CODE.  ALSO BUM
;	A CYCLE OUT OF FLOATING DIVIDE BY STARTING THE NORMALIZE
;	WHILE MOVING THE QUOTIENT INTO AR.
;	SEVERAL CHANGES TO MAKE TRACKS FEATURE WORK
;36	FIX CONO MTR TO PUT DATA ON BOTH HALVES, SO PI CAN SEE PIA
;35	FIX CONI PI TO READ BACK WRITE EVEN PARITY ENABLES
;34	FIX BLT USE OF SR, SO NO CORRECTION OF ARX NECESSARY
;33	FIX PAGE TABLE REFERENCES TO FORCE UNPAGED REF.  FIX TRAP
;	TO SET PC+1 INHIBIT.
;32	CORRECT SETTING OF SC FOR SHIFTING METER COUNTERS, TO GET
;	12 BITS UNUSED AT RIGHT WHEN IT GETS TO CORE.
;31	RECODE ASH AND ASHC TO SAVE SPACE
;30	FIX JFFO TO SHIFT AR CORRECTLY AT JFFO2.  BUM ADJSP TO USE
;	STMAC FOR UPDATING PDL POINTER.
;27	FIX CONI PAG TO READ EBUS.  CORRECT DEFINITIONS OF MBOX
;	REGISTER FUNCTIONS, WHICH HAD BITS 0 AND 3 INVERTED.
;26	FIX DEFINITIONS OF DIAG FUNC CONO MTR AND CONO TIM, WHICH
;	WERE REVERSED
;25	FIX DECODING OF PHYSICAL DEVICE NUMBER IN PI FUNCTION CODE
;	AND RE-CODE JFCL FOR FEWER MICROWORDS
;24	FIX JFFO TO SHIFT ON FIRST 6-BIT TEST STEP, AND JRSTF TO
;	KEEP E AND XR DISTINCT.  ALSO SET LOAD-ENABLE BITS IN
;	DATAI PAG, WORD.
;23	FIX CONO PI, TO HOLD AR ONTO EBUS THRU REL EBUS, BECAUSE
;	PI BOARD DELAYS CONO PI TO GET CONO SET EQUIVALENT.
;22	MORE JFCL FIXES.  MUST USE FLAG CTL/JFCL WHILE CLEARING BITS,
;	AS WELL AS WHILE TESTING THEM.  BUM A WORD OUT OF JFFO BY
;	MAKING THE SIXBIT COUNT NEGATIVE.  CHANGES SO SHIFT SUBR
;	RETURNS 2, BYTEA 1.  FIX SETMB TO STORE BACK AND FETCH.
;21	RE-WRITE JFCL TO KEEP LOW OPCODE BITS OUT OF AR0-1, BECAUSE
;	PC00 GETS PROPAGATED LEFT TO ADA -1 AND -2.
;20	FIX BLT TO LOAD BR WITH SRC-DST ADDR
;	ALSO SET TIME PARAMETERS ON CONDITIONAL FETCH FUNCTIONS
;17	CHANGE SWEEP ONE PAGE TO PUT PAGE # IN E, RATHER THAN ADDR.
;	ALSO CHANGE COND/FM WRITE TO MATCH ECO #1068.
;16	FIX JUMP FETCH MACRO TO LOAD VMA FROM PC+1 (TEST SATISFIED
;	OVERRIDES THIS TO HOLD VMA).  ALSO BUM ONE MICROWORD FROM MUUO.
;15	INCLUDE PAGE FAIL DISP IN DISP/ FIELD
;	ALSO MAKE MUUO STORE PROCESS CONTEXT WORD AT 426, AND SETUP
;	PCS FROM PC EXTENSION, CWSX FROM SXCT
;14	FIX DEFINITIONS OF SKIP/IO LEGAL, AC#0, SC0, EVEN PAR
;	ALSO FIX DATAO PAG, TO SEND LH DATA ON BOTH HALVES OF EBUS
;13	ALIGN SETEBR SO CALL TO SHIFT RETURNS CORRECTLY
;12	MAKE SURE AD COPIES AR DURING DATAO, CONO, AND CLEAR AR AT
;	SET DATAI TIME.
;11	FIXES TO CONTINUE CODE SO CONSOLE WORKS, AND CORRECTIONS TO
;	PROTECTED DEP/EXAM SO PROTECTION PROTECTS.
;10	FIX A READ MACRO TO VMA/PC+1.  AD OVERRIDES UNLESS DRAM A=1
;07	RE-WRITE OF PI CYCLE CODE TO RECOGNIZE NEW EBUS SPEC.
;06	FIX DEFINITIONS OF SKIPS 40-57 BY COMPLEMENTING 3 LOW ORDER BITS
;	FIX MULSUB TO CORRESPOND TO NEW CRA LOGIC
;05	FIX EBUS CTL DEFINITIONS TO GET F01 CORRECT.  CORRECT FLAG CTL
;	DEFINITIONS TO PREVENT LEAVE USER WHEN NOT WANTED, AND FIX
;	JRST/JFCL TO HAVE FLAGS IN AR WHEN NEEDED.
;04	FIX RETURNS FROM MULSUB, PUT BETTER COMMENTS ON SNORM CODE,
;	IMPROVE SNORM ALGORITHM TO MINIMIZE WORST-CASE TIME.
;03	FIX DISPATCH ADDRESS PROBLEMS, MOSTLY JRST/JFCL AND UUO'S.
;02	CHANGES PER INSTRUCTION SET REVIEW -- DELETE USE OF BIT12 OF
;	BYTE POINTERS, CHANGE BLT TO PUT FINAL SRC,DST ADDRESSES IN AC,
;	MAKE TRUNCATE FORM FLOATING POINT REALLY TRUNCATE, ELIMINATE
;	LOCAL JSYS SUPPORT, DELETE PXCT OPCODE (XCT W/ NON-ZERO AC IN
;	EXEC MODE), LUUO'S GO TO 40/41 OF CURRENT SPACE.
;01	UPDATES FOR .TITLE AND .TOC PSEUDO OPS,
;	AND VARIOUS CHANGES FOR PROTO HARDWARE
;00	CREATION, BASED ON BREADBOARD AS OF EDIT 66
.BIN