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Trailing-Edge - PDP-10 Archives - tops10_703_distr_bb-x140b-sb - 10,7/703anf/dndh11.p11
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.SBTTL	DNDH11 - DH11 ASYNCHRONOUS LINE INTERFACE  11 DEC 84

; THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY ONLY BE USED
;  OR COPIED IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE.
;
; COPYRIGHT (C) 1976,1977,1978,1979,1980,1981,1982,1983,1984 BY DIGITAL EQUIPMENT CORP., MAYNARD, MASS.

VRDH11=034			;FILE EDIT NUMBER

.IF NE FTDH11
.SBTTL	SET DH11 LINE SPEED

; CALL JSR PC,DHSPD
; R0/ DH11 STATUS REG ADDRESS
; R1/ NEW LINE SPEED
; R2/ LINE NO.

DHSPD:	PIOFF				; DON'T WANT ANYONE ALTERING THE DH LINE
	MOV	R1,-(P)			; SAVE SPEEDS
	BIC	#17,(R0)		; CLEAR LINE SELECT
	BISB	R2,(R0)			; SELECT THE LINE
	BIC	#^C37,R1		; GET LOW SPEEDS
	ASL	R1			; MAKE IT A WORD INDEX
	MOV	DHSPDT(R1),R2		; GET RIGHT BITS
	BMI	98$			; BAD SPEED, IGNORE
	ASL	R2			; SHIFT UP FOR DH XMIT LOCATION
	ASL	R2			; TWICE
	ASL	R2			; THRICE
	ASL	R2			; FOUR BITS WORTH
	MOV	(P),R1			; GET BACK SPEED
	SWAB	R1
	BIC	#^C37,R1
	ASL	R1			; MAKE IT A WORD INDEX
	BIS	DHSPDT(R1),R2		; ADD IN OTHER SPEED
	BMI	98$			; BAD SPEED
	SWAB	R2			; POSITION BITS
	ROR	R2
	ROR	R2
	BIS	#7,R2			; TWO STOP BITS AND 8 BIT CHARS
	BIC	#140070,R2		; STRIP EXTRA BITS
.IF EQ FT2BIT
	CMP	R2,#006307		; IF HIGHER THAN 110 BAUD
	BLOS	.+6
	BIC	#4,R2			; MAKE THAT ONE STOP BIT
.ENDC; .IF EQ FT2BIT
	CMP	#B.134,(P)		; IS THIS THE SPEED OF A 2741
	BNE	10$			; IF NOT, JUST SKIP
	BIC	#77,R2			; IF IT'S A 2741 THEN WE WANT
	BIS	#61,R2			; 6 BIT CHARS, ODD PARITY AND 1 STOP BIT
10$:	MOV	R2,DH.LPR(R0)		; SET THE LINE SPEED
97$:	MOV	(P)+,R1			; RETURN VALID SPEED IN R1
	PION				; RESTORE PI LEVEL
	CLC				; INDICATE GOOD RETURN
	RTS	PC

98$:	TST	(P)+			; POP BOGUS SPEED VALUE
	PION				; RESTORE PI LEVEL
	SEC				; FLAG ERROR
	RTS	PC
DHSPDT:	0				; 0 BAUD
	1				; 50 BAUD
	2				; 75 BAUD
	3				; 110 BAUD
	4				; 134.5 BAUD
	5				; 150 BAUD
	6				; 200 BAUD
	7				; 300 BAUD
	10				; 600 BAUD
	11				; 1200 BAUD
	12				; 1800 BAUD
	-1				; 2000 BAUD
	13				; 2400 BAUD
	-1				; 3600 BAUD
	14				; 4800 BAUD
	-1				; 7200 BAUD
	15				; 9600 BAUD
	-1				; 19000 BAUD
	16				; EXT 1.
	17				; EXT 2.
;DH-11 BREAK CONTROL (REACHED FROM DEVBK? DISPATCH TABLE)

DHBKON:	SAVE	<R3>			; SET XMIT BREAK ON A LINE
	MOV	@DB.DHB(J),R3		; GET THE DH-11 HARDWARE BASE ADDRESS
	BIS	DB.BIT(J),DH.BRK(R3)	; SET THE XMIT-BREAK BIT
	RESTORE	<R3>			; WE ARE DONE WITH R3
	RTS	PC

DHBKOF:	SAVE	<R3>			; CLEAR XMIT BREAK ON A LINE
	MOV	@DB.DHB(J),R3		; GET THE DH-11 HARDWARE BASE ADDRESS
	BIC	DB.BIT(J),DH.BRK(R3)	; CLEAR XMIT BREAK
	RESTORE	<R3>			; WE ARE DONE WITH R3
	RTS	PC
.SBTTL	DH11 CODE
; HERE TO INIT A DH11 LINE

DH.INI:
	SAVE	<R4>
	MOV	(R3),R4			; FETCH ADDRESS OF THE DH HDW
	BIT	#DH.RIE!DH.TIE,(R4)	; IF INTERRUPTS NOT ENABLED
	BNE	10$
	CLR	DHBBAR(R3)		; SET ALL LINES INACTIVE
	MOV	#FTSILO,DH.SSR(R4)	; SET SILO ALARM LEVEL
	BIS	#DH.RIE!DH.TIE,(R4)	; ENABLE INTERRUPTS
10$:	MOV	4(P),R4			; FETCH THE LCB ADDRESS
	TST	DHB.DM(R3)		; IF THERE IS A DM11BB FOR THE DH
	BNE	17$			; THEN ALLOW IT TO BE A DATASET LINE
	BIC	#LCB.DS,(R4)		; ELSE NO DATASET
17$:	MOV	LC.SPD(R4),R1		; GET THE LINE SPEED
	BIT	#LCB.AB,(R4)		; IF THIS IS AN AUTO BAUD LINE
	BEQ	20$
	BIC	#LCB.LS,(R4)		; CLEAR LOW SPEED
	MOV	#B.HSPD,R1		; ASSUME AUTO BAUD
20$:
.IF NE TTYDHN				; IF NO TTYS DON'T TELL -10
	CMP	6(P),#TTDHIN		; IF TTY LINE
	BNE	25$
	MOV	R1,-(P)			; SET THE LINE SPEED
	JSR	PC,SETSPD
	TST	(P)+
	BR	30$
.ENDC; .IF NE TTYDHN
25$:
	MOV	(R3),R0			; GET THE DH HDW ADDRESS
	JSR	PC,DHSPD		; SET THE SPEED
30$:	MOV	J,LC.BLK(R4)
	MOV	6(P),LC.INS(R4)		; SET THE INTERRUPT SERVICE PROCS
	MOV	10(P),LC.OUS(R4)	; FOR THE LINE
	RESTORE	<R4>
	RTS	PC
;BLOCKS FOR EACH DH11
			;FIRST WORD IS HDW ADR OF DH11
			; IF HDW IS NOT PRESENT WILL BE ZERO
	DHBBAR=2	;ACTIVE LINES(SOFTWARE BAR)
	DHB.BN=4	;FIRST LINE # IN GROUP
	DHB.DM=6	;ADR OF DM11BB IF PRESENT, ELSE 0
	DHB.VC=10	;DH11 VECTOR ADDRESS
	DHB.LC=12	;START OF THE LINE CONTROL BLOCKS
	DHB.SZ=12+<20*LC..SZ>	;SIZE OF A DH11 BLOCK

.MACRO XX

.MACRO XXX	NNN
.IF NDF DHS'NNN
	.IIF EQ DHL'NNN, DHS'NNN=0
	.IIF EQ DHL'NNN-1, DHS'NNN=B.HSPD
	.IIF EQ DHL'NNN-2, DHS'NNN=AL.SPD
	.IIF EQ DHL'NNN-3, DHS'NNN=MP.SPD
	.IIF EQ DHL'NNN-4, DHS'NNN=MP.SPD
	.IIF EQ DHL'NNN-5,DHS'NNN=RP.SPD
	.IIF EQ DHL'NNN-6,DHS'NNN=RA.SPD
	.IIF GE DHL'NNN-7,DHS'NNN=B.LSPD
.ENDC
.IF NDF DHC'NNN
	.IF EQ DHL'NNN-1
		DHC'NNN=LCB.AB
	.IFF
		DHC'NNN=0
	.ENDC
.ENDC
LCB'NNN:.WORD	DHC'NNN		;LC.CAR
	.IIF NDF DHZ'NNN,DHZ'NNN=0
	.BYTE	DHZ'NNN		;LC.STA
	.BYTE			;LC.MOD
	.WORD	DHS'NNN		;LC.SPD
	.WORD	DHS'NNN		;LC.PSP
	.WORD	0		;LC.BLK
	.WORD	0		;LC.INS
	.WORD	0		;LC.OUS
	.IF NE NDZ11
		.WORD	0	;LC.CNT
		.WORD	0	;LC.BUF
	.ENDC
.ENDM

.MACRO	X	A
	.IIF	LT DH.MAX-NDH11,.ERROR	200;# DH11S REQUIRED EXCEEDS # CONFIGURED
DH'A'BLK:	0
	0		;DHBBAR
	A*20		;DHB.BN
	0		;DHB.DM
	0		;DHB.VC
	Q=A*20
	.REPT	20
		XXX \Q
		Q=Q+1
	.ENDR
.ENDM	X
	Z=0

;BUILD A DH11 BLOCK FOR EACH DH11
.REPT	DH.MAX
	X	\Z
	Z=Z+1
.ENDR
.ENDM
	XX
DHBLIM:
.SBTTL	DH11 RECEIVE INTERRUPT SERVICE

.MACRO	X	A
DHI'A'IN:
	MOV	R0,-(P)
	MOV	#DH'A'BLK,R0
.ENDM	X

	Z=DH.MAX-1
.REPT	DH.MAX
	X	\Z
.IIF NE Z,BR	DHIINT
	Z=Z-1
.ENDR



DHIINT:	SAVE	<R1,R2,R3,R4,J>		;SAVE REGISTERS
	MOV	(R0),-(P)		;SET DH11 ADDRESS FOR CHAR LOOP
	ADD	#DHB.LC,R0		;BASE OF THE LINE CONTROL BLOCKS
	MOV	R0,-(P)			;SET LCB BASE FOR PER-CHAR LOOP

;LOOP EMPTYING THE DH INPUT SILO

10$:	MOV	2(P),R3			;RESTORE THE HARDWARE ADR
	MOV	2(R3),R1		;GET NEXT CHAR FROM SILO
	BPL	99$			;DISMISS INTERRUPT WHEN NO MORE
	MOV	R1,J			;COPY WORD
	SWAB	J			;SWAP HALVES
	BIC	#^C17,J			;LEAVE ONLY RELATIVE LINE#
	ASL	J			;WORD INDEX
	MOV	LCBIDX(J),J		;GET LCB OFFSET
	ADD	(P),J			;PLUS BASE ADDRESS OF LCB'S
	MOV	LC.INS(J),R2		;GET THE SERVICE PROC
	BEQ	10$			;PROCESS THE NEXT CHAR IF THERE IS NONE
	MOV	LC.BLK(J),J		;GET THE CONTROL BLOCK
	BEQ	10$			;PROCESS THE NEXT CHAR IF THERE IS NONE
	JSR	PC,(R2)			;PROCESS THE CHAR
	BR	10$			;AND PROCESS THE NEXT CHAR

99$:	ADD	#4,P			;POP OFF SAVED ADDRESSES
	RESTORE	<J,R4,R3,R2,R1,R0>
	RTI
.SBTTL	DH11 TRANSMIT INTERRUPT SERVICE

.MACRO	X	A
DHO'A'IN:	MOV	R0,-(P)
	MOV	#DH'A'BLK,R0
.ENDM	X

	Z=DH.MAX-1
.REPT	DH.MAX
	X	\Z
.IIF NE Z,BR	DHOINT
	Z=Z-1
.ENDR

DHOINT:	SAVE	<R1,R2,R3,R4,J>		;SAVE REG'S
	MOV	@R0,R1			;GET DH11 HDW ADDRESS
	BIT	#DH.NXM,@R1		;DID THE DH GET A NXM?
	BEQ	10$			;NO, NORMAL INTERRUPT
.IF EQ DGUTS
	TRAP
.IFF
	TWIDDLE				;COUNT THE NXM ERRORS
	BIS	#DH.CNX,(R1)		;CLEAR THE ERROR
.ENDC ; .IF EQ DGUTS
10$:	BIC	#DH..TI,@R1		;CLEAR TRANSMIT-INTERRUPT FLAG
	MOV	R0,J			;GET ADDRESS OF THE BLOCK'S END
	ADD	#DHB.SZ,J
	MOV	DHBBAR(R0),R2		;GET SOFTWARE STATUS REGISTER
	BIC	12(R1),R2		;CLEAR BITS FOR LINES STILL ACTIVE
	BEQ	99$			;BRANCH IF NO LINES
	BIC	R2,DHBBAR(R0)		;CLEAR SOFTWARE BAR BITS
30$:	SUB	#LC..SZ,J		;BACK UP TO THE PREVIOUS LCB
	ASL	R2			; AND CHECK THIS LINE'S XMITTER
	BLO	32$			;FOUND A NEWLY INACTIVE LINE SO FIX IT
	BNE	30$			; NO CHANGE,SO TRY NEXT LINE
					; NOTHING LEFT TO CHECK
99$:	RESTORE	<J,R4,R3,R2,R1,R0>	;RESTORE AC'S
	RTI

32$:	MOV	R2,-(P)			;SAVE COMBINED STATUS
	MOV	J,-(P)			;SAVE LINE NUMBER
	MOV	LC.OUS(J),R3		;GET THE OUTPUT SERVICE PROC
	BEQ	33$			;AND TRY NEXT LINE IF NONE
	MOV	LC.BLK(J),J		;GET THE CONTROL BLOCK
	BEQ	33$			;AND TRY THE NEXT LINE IF NONE
	JSR	PC,(R3)			;DO SOMETHING FOR THE XMITTER.
33$:	MOV	(P)+,J			;GET BACK LINE CONTROL BLOCK
	MOV	(P)+,R2			;GET BITS AGAIN
	BR	30$			;AND FIND REST
.SBTTL	TTY OUTPUT INTERRUPT SERVICE

.IF NE TTYDHN+RDADHN

;HERE TO TYPE ON A DH11 LINE
; CALL	MOV	<CHAR>,R0
;	JSR	PC,DHTYPE
DHTYPE:	MOVB	R0,DB.BUF(J)		;SAVE CHAR TO TYPE
	MOV	#-1,R0			;GET COUNT
	MOV	J,R1			;COPY DEVICE BLOCK ADR
	ADD	#DB.BUF,R1		;MAKE POINTER TO BUFFER

;HERE TO TYPE A STRING OF CHARS ON A DH11 LINE
; CALL	MOV	<ADR>,R1
;	MOV	<-COUNT>,R0
;	JSR	PC,DHIMTY

DHIMTY:	MOV	DB.DHB(J),R2		;GET ADR OF DH11 BLOCK
	MOV	@R2,R3			;GET HDW ADR OF DH11
	BIC	#17,@R3			;CLEAN LINE SELECT
	BISB	DB..LN(J),@R3		;SELECT OUR LINE
	BIC	DB.BIT(J),14(R3)	;STOP SENDING BREAK
	MOV	R1,6(R3)		;TELL DH11 WHERE DATA IS
	MOV	R0,10(R3)		;TELL DH11 HOW MANY BYTES
	BIS	DB.BIT(J),DHBBAR(R2)	;FLAG LINE IS GOING
	ASR	R0
	ASR	R0
	DEC	R0			; MAKE SURE WE TIME FOR AT LEAST 1 SECOND
					; IF CLOCK IS ABOUT TO TICK, AND
					; WE USE A MINUS 1, WE WILL TIME
					; ONLY FOR ABOUT 1 JIFFY, AND LOSE

	MOVB	R0,DB.TIM(J)		;SET OUTPUT TIMER (ABOUT .2 PER CHAR)

	BIS	DB.BIT(J),12(R3)	;START LINE
	RTS	PC
.ENDC ; .IF NE TTYDHN+RDADHN
.SBTTL	DH11/DM11 MODEM CONTROL ROUTINES  4 NOV 83

;HERE TO WAIT FOR DM11 TO SETTLE

.IF NE FTDM11

	DH=R3

;	DM.TIM IS THE MAX. SETTLING TIME FOR THE DM11 IN MEMORY CYCLES
; THE PROCEDURE DMWAIT DELAYS FOR AT LEAST THIS TIME

	ND	DM.TIM,<^D40>	;SPEC FOR DM WAIT TIME IS 20 CORE
				; OR 40 MOS CYCLES

.MACRO	DMPEEK	QADR,QLINE
.IF DF PEEKDM
.IIF NB <QADR>,	CMP	#'QADR,DH
.IIF B <QADR>,	CMP	#170500,DH
DMPK.A=.-2
	BNE	102$
	MOV	(DH),R1
	BIC	#^C17,R1
.IIF NB <QLINE>,	CMP	#'QLINE,R1
.IIF B <QLINE>,	CMP	#0,R1
DMPK.L=.-2
	BNE	102$
	MOV	(DH),#0
DMPKDS=.-2
	MOV	2(DH),#0
DMPKLS=.-2
102$:
.ENDC; .IF DF PEEKDM
.ENDM	DMPEEK


DMWAIT:	TST	(R0)+			; PREPARE SUCCESS RETURN
	SAVE	<R1>
	MOV	#<<DM.TIM+5>/5>,R1	; LOOP TILL THE DM11 SETTLES
					;  (8E-6 SEC TYP,16E-6 SEC MAX)
100$:	BIT	#DM.BSY,(DH)		; CHECK IF THE DM11 IS CYCLING
	BEQ	101$			; AND BRANCH IF DM11 HAS SETTLED
	SOB	R1,100$
	TWIDDLE				; IF DM11 IS BROKEN
	TST	-(R0)			; SET UP FAILURE RETURN
101$:	DMPEEK	170500,0
	RESTORE	<R1>
	RTS	R0
;  THIS IS THE DM-11BB SCAN CODE.  IT MUST BE CALLED EVERY 1/6 OF A SECOND
;  TO KEEP TRACK OF CHANGES TO THE DM'S. THIS CODE IS ALL DONE AT LOOP LEVEL.
;  NONE OF THE DM-11 SUPPORT IS INTERRUPT DRIVEN.

DMSCN:	MOV	#DH0BLK,-(P)		; PUSH/SAVE LOC OF FIRST DH-11

;JUMP TO HERE TO CHECK THE NEXT DH-11

DMS.00:	CMP	#DHBLIM,(P)		; HAVE WE DONE ALL THE DH-11'S?
	BHI	10$			; IF NOT THEN SKIP,
	TST	(P)+			; ELSE RESTORE P AND
	RTS	PC			; RETURN

;START CHECKING OUT THIS DH-11'S LINES

10$:	MOV	(P),J			; GET THE ADDRESS OF THE DH AND
	ADD	#DHB.SZ,(P)		; INCR @P FOR NEXT TIME.
	MOV	DHB.DM(J),R3		; GET ADDRESS OF THE DM-11
	BEQ	DMS.00			; BUT IF NONE, THEN DO NEXT DH.
	ADD	#DHB.LC,J		; BUMP J TO POINT TO FIRST LCB
	BIS	#DM.SCN,(R3)		; AND CLEAR THE DM-11 SCANNER.
	BR	DMS.11			; NOW JUMP INTO MIDDLE OF CHECK LOOP.

; JUMP HERE TO CHECK NEXT LINE OF CURRENT DM-11.

DMS.10:	ADD	#LC..SZ,J		; STEP TO THE NEXT LCB
	CMP	J,(P)			; HAVE WE STEPPED TO NEXT DH-11?
	BHIS	DMS.00			; IF SO THEN GO DOIT.
	BIS	#DM.STP,(R3)		; ELSE STEP TO NEXT LINE

;ENTER HERE TO RE-EVALUATE THE CURRENT LINE

DMS.11:	JSR	R0,DMWAIT		; WAIT FOR DM TO SETTLE
	TRAP				; QUIT IF THE DM IS BROKEN
	BIT	#LCB.DS,LC.CAR(J)	; IF THIS ISN'T A DATA-SET LINE-
	BEQ	DMS.10			; THEN GO DO THE NEXT ONE.
	MOV	R3,R1			; GET LINE
	TST	(R1)+			; STATUS REG (DMBASE+1)
	BIS	#DM.LE,(R1)		; INDICATE THAT WE WANT TO READ IT,
	MOV	(R1),R0			; GET STATUS BITS FROM THE DM
	MOV	LC.BLK(J),R4		; GET THE ADDR OF THE DDB.
	BEQ	DMS.12			; IF NO DDB THEN RESET LCB
.IF EQ TTYN
	BR	DMS.13			; IF IT'S NOT A TTY, SET DTR
.IFF
	CMP	#TTDHIN,LC.INS(J)	; IF IT'S NOT A TTY LINE
	BNE	DMS.13			; THEN SET DTR
.ENDC;.IF EQ,TTYN

;CONTINUED ON NEXT PAGE
;CONTINUED FROM PREVIOUS PAGE

; AT THE TIME OF DISPATCH THE REGISTERS CONTAIN
;	R0 <-> CONTAINS THE DM STATUS
;	R1 <-> POINTER TO STATUS
;	R2 <-> CONTAINS THE DM-11 STATE BITS
;	R3 <-> DM BASE ADDRESS
;	R4 <-> POINTER TO DDB
;	J  <-> POINTER TO THE LCB

	MOVB	LC.STA(J),R2		; GET THE STATE OF THE LCB
	ASSERT	R2 GE #0		; ASSURE OURSELVES THAT IT IS -
	ASSERT	R2 LE #LCS.MX		; INDEED A VALID STATE.
	JMP	@10$(R2)		; AND JUMP OFF TO PROPER ROUTINE.

;DATASET STATE DISPATCH TABLE

10$:	DMSVIR				; (00) VIRGIN STATE
	DMSRNG				; (02) RINGING STATE
	DMSCDT				; (04) CARRIER DETECT STATE
	DMSCDS				; (06) CARRIER DETECT SATISFIED.
	DMSABD				; (08) AUTO BAUD DETECT STATE
	DMSOKU				; (10) RUNNING NOT CONNECTED
	DMSOKW				; (12) RUNNING  IN 3 SEC WAIT STATE
	DMSOKC				; (14) RUNNING CONNECTED TO -10
	DMSLOC				; (16) LOST CARRIER STATE
	DMS.15				; (18) SOMEONE WANTS US TO HANG UP
	DMSHNG				; (20) HANG UP STATE
.IF NE FTDN11
	DMSDIA				; (22) DIALER RUNNING STATE
	DMSDSU				; (24) DIALOUT SUCCEEDED
	DMSDFA				; (26) DIALOUT FAILED HANG UP PHONE
.ENDC;.IF NE FTDN11

.IIF NE .-10$-2-LCS.MX,.ERROR <.-10$-2> ;DISPATCH STATE PHASE ERROR IN DNDM11
; UTILITY ROUTINES FOR MODEM SUPPORT.

; RESET A LINE CONTROL BLOCK

DMS.12:	MOVB	#LCS.VG,LC.STA(J)	; RESTORE VIRGINITY
	BIC	#LCB.TM,LC.CAR(J)	; CLEAR THE TIMER
	CLR	(R1)			; CLEAR RTS,DTR
	TST	R4			; IS THERE ANY DDB?
	BEQ	DMS.10			; NO, TO THE NEXT LINE
	BR	DMS.16			; GO CLEAR THE DDB'S BITS

;ASSERT DATA TERMINAL READY (ASSUMES R3 -> DM-11)

DMS.13:	BIS	#DM.LE!DM.DTR!DM.RTS,(R1) ; SET DTR
	BR	DMS.10			; AND GO DO NEXT LINE

; HERE TO CHECK IF STATUS HAS CHANGED, AND IF SO SEND NEW STATUS
; TO THE -10. (R4 -> DDB, R2 HAS NEW STATUS)

DMS.14:	CMP	R2,DB.DCS(R4)		; HAS IT CHANGED?
	BEQ	DMS.10			; IF NOT, THEN DO NEXT LINE
	MOV	R2,DB.DCS(R4)		; SET NEW STATUS,
	SAVE	<J>			; NOW FUDGE 'J' AND
	MOV	R4,J			; QUEUE
	JSR	PC,QUEXDS		; THE DDB FOR SERVICE.
	RESTORE	<J>			; CLEAN UP, AND
	BR	DMS.10			; GO DO NEXT LINE
; HERE TO HANG UP A LINE. R4 -> DDB,  J -> LCB,  R1 -> DM STATUS REGISTER

DMS.15:
.IF NE FTDN11
	BITB	#DNDIAL,DB.DNS(R4)	; CONTROLLED BY DN11/801?
	BEQ	30$			; NO

;SINCE THE DATASET LINE IS BEING CONTROLLED BY A DN11/801 (I.E.,
;SOMEONE DIALED OUT ON THE LINE RATHER THAN CALLING IN ON IT) WE
;MUST CLEAR THE DN11/801 TO RELEASE CONTROL OF THE PHONE LINE.

	SAVE	<J,R1>			; YES, SAVE SOME ACS
	MOV	R4,J			; SETUP J WITH DDB ADDRESS
	JSR	PC,DNCLR		; ZAP THE DN11/801
	RESTOR	<R1,J>			; GET BACK OUR ACS
.ENDC;.IF NE FTDN11
30$:	BIC	#DM.DTR!DM.RTS,(R1)	; CLEAR RTS, DTR
	MOVB	#LCS.HG,LC.STA(J)	; SET HANG UP STATE
	BIC	#LCB.TM,LC.CAR(J)	; FIRST CLEAR OUT THE TIMER,
	BIS	#MDMHDT*6,LC.CAR(J)	; NOW SET MODEM HOLD DOWN TIME.

; HERE TO CLEAR OUT THE DDB.

DMS.16:	MOV	DB.DCS(R4),R2		; GET DDB CHARACTERISTICS
	BIC	#TS.DTR!TS.CAR,R2	; RESET THESE
	BR	DMS.14			; TELL THE -10 THE NEWS

; HERE TO PUT A LINE IN THE RUNNING STATE

DMS.17:	BIS	#DM.RTS!DM.DTR!DM.LE,(R1); SET RTS AND DTR IN THE DM-11
	MOVB	#LCS.RU,LC.STA(J)	; ASSUME WE ARE IN UNCONNECTED STATE
					; (WE WILL CHECK LATER)
	BIC	#LCB.TM,LC.CAR(J)	; CLEAR ANY TIMERS.
DMS.18:	MOV	DB.DCS(R4),R2		; GET LINE CHARACTERISTICS
	BIS	#TS.DTR!TS.CAR,R2	; SET THESE BITS
	BR	DMS.14			; NOW TELL THE -10
;THE DATASET "STATE" MACHINE, SUCH AS IT IS

;(00) VIRGIN STATE, WAIT FOR RING

DMSVIR:	MOV	DB.DCS(R4),R2		; KEEP COPY OF DB.DCS IN R2
	BIT	#DM.RNG!DM.CAR,R0	; IS RING OR CARRIER SET?
	BEQ	DMS.16			; NO, CLEAR THE BITS IN THE DDB
	BIS	#TS.RNG,R2		; YES, SET THE FACT THAT RING IS UP.
	BIC	#TS.DTR,R2		; CLEAR CARRIER AND DTR
	MOVB	#LCS.RG,LC.STA(J)	; SET STATE TO RINGING
	BR	DMS.14			; TELL THE -10 AND DO NEXT LINE.

;(02) DATASET PHONE IS RINGING

DMSRNG:	BIS	#DM.RTS!DM.DTR!DM.LE,(R1); SET DTR, RQS
	MOVB	#LCS.CD,LC.STA(J)	; SET CARRIER DETECT STATE
	BIS	#30.*6,LC.CAR(J)	; SET TIMER TO RUN FOR 30 SEC
	BR	DMSJ11			; AND CHECK THE LINE AGAIN.

;(04) WE HAVE ANSWERED THE PHONE, NOW WAIT FOR CARRIER TO APPEAR

DMSCDT:	BIT	#DM.CAR,R0		; DID THE CARRIER COME UP?
	BEQ	40$			; BRANCH IF NOT.
	CLR	DB.STR(R4)		; CLEAR THE STRING POINTER
	CLRB	DB.ASP(R4)		; SO WE DO NOT OUTPUT
	CLRB	DB.HLD(R4)		; BOGUS MESSAGES WHEN PEOPLE
					; DIAL IN
	BIT	#LCB.AB,LC.CAR(J)	; IS THIS AN AUTO-BAUD LINE?
	BEQ	30$			; IF NOT THEN LEAVE SPEED ALONE
.IF NE FTDN11
	BITB	#DNDIAL,DB.DNS(R4)	;AUTOBAUD DATASET - BUT IF DIALING OUT
	BNE	20$			; THEN ASSUME USER SPEED IS CORRECT
.ENDC ;FTDN11
	BIC	#LCB.LS,LC.CAR(J)	; CLEAR LOW SPEED BIT
	SAVE	<J,#B.HSPD>		; SAVE LCB POINTER, PUSH SPEED.
10$:	MOV	LC.BLK(J),J		; GET POINTER TO DDB FOR SETSPD.
	JSR	PC,SETSPD		; SET SPEED TO AUTO-BAUD SPEED
	RESTORE	<J,J>			; GET POINTER TO LCB BACK.
20$:	MOVB	#LCS.CS,LC.STA(J)	; SET WAIT STATE.
	BIC	#LCB.TM,LC.CAR(J)	; AND SET THE TIMER TO RUN FOR
	BIS	#1.*6,LC.CAR(J)		; ANOTHER SECOND
	BR	DMSJ10			; AND WE ARE DONE WITH THIS FOR NOW.

; HERE IF DATA SET BUT NOT AUTOBAUD TO RESET SPEED

30$:	SAVE	<J,LC.PSP(J)>		; GET PERM SPEED
	BR	10$			; SET SPEED

; HERE TO CHECK FOR TIME OUT DURING CARRIER DETECT

40$:	BIT	#LCB.TM,LC.CAR(J)	; HAS THE TIMER RUN OUT?
	BEQ	DMSJ15			; YES, HANG UP THE PHONE
	DEC	LC.CAR(J)		; OTHERWISE COUNT DOWN TIMER
	BR	DMSJ10			; AND DO THE NEXT LINE
;(06) CARRIER DETECTED, WAIT A MOMENT FOR THINGS TO SETTLE DOWN. THIS IS
; SO WE IGNORE THE RANDOM GARBAGE ON THE LINE CAUSED BY INSERTING THE
; PHONE IN THE ACOUSTIC COUPLER.

DMSCDS:	BIT	#LCB.TM,LC.CAR(J)	; HAS THE TIMER RUN OUT?
	BEQ	10$			; YES, MAKE SURE WE STILL HAVE CARRIER
	DEC	LC.CAR(J)		; COUNT DOWN ANOTHER TICK
	BR	DMSJ10			; AND GO DO THE NEXT LINE

10$:	BIT	#DM.CAR,R0		; IS CARRIER STILL UP?
	BEQ	20$			; TAKE REMEDIAL ACTION IF NOT.
	BIT	#LCB.AB,LC.CAR(J)	; IF THIS IS NOT AN AUTO-BAUD LINE -
	BEQ	DMS.17			; THEN BRING IT ON LINE NOW.
	MOVB	#LCS.AB,LC.STA(J)	; IF IT IS, THEN GO TO AUTO-BAUD STATE
	BIS	#30.*6,LC.CAR(J)	; AND SET FOR A 30 SEC TIME OUT
	BR	DMS.18			; GO MARK TERMINAL UP (SET DTR)

20$:	MOVB	#LCS.CD,LC.STA(J)	; IF CARRIER WENT AWAY, GO BACK TO
	BIS	#28.*6,LC.CAR(J)	; CARRIER DETECT AND A 28 SEC TIME OUT.
	BR	DMSJ10			; NOW GO DO NEXT LINE

;(08) WAITING FOR USER TO AUTOBAUD (TYPE <CR>)

DMSABD:
.IF NE FTDN11
	BITB	#DNDIAL,DB.DNS(R4)	; DIALING OUT?
	BNE	DMS.17			; YES, ALL SET
.ENDC ;FTDN11
	BIT	#DM.CAR,R0		; CARRIER STILL THERE ?
	BEQ	DMSJ15			; NO, HANG IT UP
	BIT	#LCB.TM,LC.CAR(J)	; OTHERWISE SEE IF HE HAS TIMED OUT.
	BEQ	DMSJ15			; IF HE HAS THEN HANG HIM UP
	DEC	LC.CAR(J)		; OTHERWISE DECREMENT TIMER, AND
	BR	DMSJ10			; GO DO THE NEXT LINE



;CONVENIENT JUMPS

DMSJ10:	JMP	DMS.10			; CHECK NEXT DATASET LINE
DMSJ11:	JMP	DMS.11			; RECHECK CURRENT DATASET LINE
DMSJ12:	JMP	DMS.12			; RESET THE LINE
DMSJ14:	JMP	DMS.14			; SEND STATUS TO -10 IF CHANGED
DMSJ15:	JMP	DMS.15			; HANG UP THE PHONE
DMSJ17:	JMP	DMS.17			; SET TERMINAL TO RUNNING STATE
;(10) WE ARE RUNNING BUT NOT CONNECTED

DMSOKU:	TST	@R4			; HAVE WE BEEN CONNECTED YET?
	BGE	DMSAOK			; IF NOT, JUST CHECK CARRIER
	BIC	#LCB.TM,LC.CAR(J)	; IF WE HAVE, RESET THE TIMER
	BIS	#3*6,LC.CAR(J)		; AND SET IT FOR 3 SEC
	MOVB	#LCS.RW,LC.STA(J)	; AND GO TO CONNECT WAIT STATE.
	BR	DMSAOK			; (ALSO CHECK CARRIER)

;(12)  IN THIS STATE WE ARE WAITING FOR A CONNECT TO THE -10 TO SETTLE
; DOWN.  THE REASON THIS STATE IS NECESSARY IS THAT THE -10 SENDS A LOT
; OF STATUS MESSAGES THAT IT DOESN'T REALLY MEAN DURING THE INITAL STARTUP.
; IF ONE OF THESE STATUS MESSAGES HAPPENS TO CLEAR DTR THE PHONE WILL
; HANG UP... (SIGH)

DMSOKW:	BIT	#LCB.TM,LC.CAR(J)	; HAS THE TIMER RUN OUT YET?
	BEQ	10$			; IF IT HAS, GO CHANGE STATE
	DEC	LC.CAR(J)		; OTHERWISE COUNT OFF NEXT TICK
	BR	DMSAOK			; AND CHECK THE CARRIER BIT

10$:	MOVB	#LCS.RC,LC.STA(J)	; GO TO CONNECTED STATE
	BR	DMSAOK			; AND CHECK CARRIER

;(14) WE ARE UP AND RUNNING, CONNECTED TO A -10

DMSOKC:	TST	@R4			; ARE WE STILL CONNECTED
	BLT	DMSAOK			; YES, CHECK CARRIER
	MOVB	#LCS.RU,LC.STA(J)	; NO, CHANGE STATE
;	BR	DMSAOK			; AND CHECK CARRIER

;MAKE SURE CARRIER IS STILL PRESENT

DMSAOK:	BIT	#DM.CAR,R0		; IS CARRIER STILL UP?
	BNE	DMSJ10			; YES, LINE IS OK, CHECK NEXT ONE
	MOVB	#LCS.LC,LC.STA(J)	; NO, SET TO CARRIER LOST STATE
	BIC	#LCB.TM,LC.CAR(J)	; CLEAR AND
	BIS	#5*6,LC.CAR(J)		; SET THE 5 SEC TIMER
	BR	DMSJ10			; AND GO DO THE NEXT LINE
;(16) WE HAVE LOST CARRIER, GIVE IT A FEW SECONDS TO REAPPEAR BEFORE
; HANGING UP IN CASE IT IS JUST A MOMENTARY LINE OUTAGE.

DMSLOC:	BIS	#DM.DTR!DM.RTS!DM.LE,(R1); KEEP RQS AND DTR UP!
	BIT	#DM.RNG,R0		; GOT A NEW CALL TRYING TO GET IN?
	BNE	DMSJ15			; YES, THEN HANG UP THE OLD ONE FIRST
					; (SO THE -10 DETACHES OLD JOB, ETC)
	BIT	#DM.CAR,R0		; IS CARRIER BACK??
	BNE	DMSJ17			; IF SO, TELL THE -10
	BIT	#LCB.TM,LC.CAR(J)	; HAVE WE TIMED OUT YET?
	BEQ	DMSJ15			; IF SO, THEN HANG IT UP
	DEC	LC.CAR(J)		; OTHERWISE COUNT OFF THE TIME
	BR	DMSJ10			; AND GO DO THE NEXT LINE

;(20) THE LINE IS HUNG UP. WAIT FOR PHONE TO SETTLE DOWN BEFORE RE-ENABLING
; IT FOR ANOTHER INCOMING CALL.

DMSHNG:	BIT	#LCB.TM,LC.CAR(J)	; TIMED OUT?
	BEQ	DMSJ12			; IF SO, THEN RESET LINE
	DEC	LC.CAR(J)		; OTHERWISE COUNT TIME
	BR	DMSJ10			; AND DO THE NEXT LINE

.IF NE FTDN11
;(22) THIS LINE HAS INITIATED A DIALOUT REQUEST. WAIT FOR SUCCESS/FAILURE

DMSDIA:	BIS	#DM.LE!DM.RTS!DM.DTR,(R1)  ; MAKE SURE MODEM ENABLED
	BR	DMSJ10			; AND CHECK THE NEXT LINE

;(24) THE DIALOUT HAS SUCCEEDED, TELL THE -10

DMSDSU:	BIT	#DS.XDS,@R4		; ROOM FOR NEW DEVICE CONTROL STATUS?
	BNE	DMSDIA			; NO, WAIT LONGER THEN
	JMP	DMSRNG			; YES, WAIT FOR CARRIER CONFIRM

;(26) THE DIALOUT FAILED, TELL THE -10

DMSDFA:	BIT	#DS.XDS,@R4		; ROOM FOR NEW STATUS YET?
	BNE	DMSDIA			; NO, WAIT LONGER THEN
	BR	DMSJ15			; YES, GO HANG UP THE LINE
.ENDC;.IF NE FTDN11
.ENDC;.IF NE FTDM11
.SBTTL	DH11 ROUTINE FOR DDCMP  28 MAR 79

	DH=%3

.IF NE NDHMPT!NADHLN!NDHTRB!RDPDHN!FT.MPT	;++DH11++ DEPENDENCE FOR FT.MPT ASSUMED IN THIS TEST ;--


;INITIALIZE A DDCMP LINE

DHDINI:	MOVB	LB..LN(J),R2		;GET THE DH LINE #
.IIF NE FT.RDM!FT.RDP,	MOV	J,-(P)	;SAVE THE LINE BLOCK ADR
	MOV	#DDDHOU,-(P)		;GET THE OUTPUT INTERRUPT SERVICE PROC
	MOV	#DDDHIN,-(P)		;GET THE INPUT INTERRUPT SERVICE PROC
	MOV 	LB.LCB(J),-(P)		;GET THE LINE CONTROL BLOCK ADDRESS
.IF NE FT.RDM
	BIT	#LS.MPT,(J)		;IF MULTIPOINT
	BEQ	11$
	TST	LB.MPL(J)		;AND NOT A TRIBUTARY
	BEQ	11$
	CLR	J			;MUSTN'T SAVE THE BLOCK ADR IN
					;THE LCB BECAUSE ITS OFFLINE
11$:
.ENDC ;.IF NE FT.RDM
	JSR	PC,DH.INI		;INIT THE DH LINE
	ADD	#6,P			; POP THE ARGS
.IIF NE FT.RDM!FT.RDP,	MOV	(P)+,J	;RESTORE THE LINE BLOCK ADR
	RTS	PC
;ENABLE RECEIVER

DHRBEG:	BIS	#LS..RG,(J)		;FLAG RECEIVER GOING
	MOV	LB.IPT(J),-(P)		;GET  BUFFER ADR
	ADD	J,(P)
	MOV	(P),LB.SRR(J)		;SET RECEIVER BUFFER
	MOV	#-1,LB.SRR+2(J)		;AND LENGTH
	INC	(P)			;SAME FOR SECONDARY BUFFER
	MOV	(P)+,LB.SRR+4(J)
	MOV	#-1,LB.SRR+6(J)
	MOV	#DHRSYN,LB.RDN(J)	;AND SET MESSAGE SEG PROC
	RTS	PC


;CHUCK GARBAGE TILL DDCMP HEADER STARTS

DHRSYN:	MOV	LB.SRR(J),R0		;GET ADDRESS OF NEXT CHAR IN BUFFER
	CMPB	#ENQ,R1			;IF <ENQ>
	BEQ	09$
	CMPB	#SOH,R1			;OR IF <SOH>
	BEQ	09$
	CMPB	#DLE,R1			;OR IF <DLE>
	BNE	11$
09$:
.IF NE FT.MPT
	BITB	#MP.OFF,LB.MPS(J)	;IF MULTIPOINT OFFLINE CONDITION
	BEQ	10$			;WE MAY HAVE A PROBLEM
	TST	LB.MPL(J)		;IF ITS NOT A TRIBUTARY
	BNE	11$			;FORGET THIS BYTE
	BIS	#LS..RG,(J)		;ELSE SET RECEIVER GOING
					;(SO WE DON'T LOSE THIS BYTE)
	JSR	PC,SELNXT		;PUT STATION BACK ONLINE
	CLRB	LB.MPT(J)		;BUT CLEAR THE TIMER BECAUSE THIS
					;IS ONLY PRETEND
	BICB	#MP.SEL,LB.MPS(J)	;AND ALSO THE SELECTED FLAG
.ENDC ;.IF NE FT.MPT

;MAKE THE NEXT BUFFER THE SECOND HALF OF THE HEADER

10$:	ADD	#3,R0
	SUB	#2,LB.SRR+2(J)		;AND FIX THE COUNT FOR THE FIRST HALF
	MOV	#-4,R1			;SET COUNT FOR SECOND HALF
	MOV	#DDRJNK,LB.RDN(J)	;AND SET MESSAGE SEG PROC
	RTS	PC
11$:	DEC	LB.SRR(J)		;ELSE BACK UP TO THE BUFFER'S START
	MOV	#-1,R1
	RTS	PC
;ENABLE XMITTER

DHXBEG:
.IF NE FTTRIB
	BIT	#LS.MPT,(J)		;IF NOT MULTIPOINT
	BNE	DHXBG2
.ENDC
DHXBG0:	JSR	PC,@LB.XDN(J)		;GET THE FIRST BUFFER LOAD
	MOV	R0,LB.SXR(J)
	MOV	R1,LB.SXR+2(J)
	BNE	DHXBG3			;IF BUFFER EMPTY, EXIT
	BIC	#LS..XG!LS.XDT!LS.XCT,(J)	;SIGNAL XMITTER STOPPED
	RTS	PC

DHXBG1:	MOV	LB.SXR+4(J),LB.SXR(J)	;SET 2ND BUFFER AS FIRST
	MOV	LB.SXR+6(J),LB.SXR+2(J)
	BNE	DHXBG3
	BR	DHXBG0			;IF ITS EMPTY FILL IT


.IF NE FTTRIB
DHXBG2:	BITB	#MP.CMS,LB.MPS+1(J)	;IF ALTER MODEM STATE ENABLED WHILE
	BEQ	DHXBG0			;REQUEST TO SEND IS DISABLED
	BITB	#MP.RTS,LB.MPS+1(J)
	BEQ	DHXBG0
	JSR	R0,DMSTAT		;FIX THE DM11 LINE STATUS
	.BYTE	0,MP.RTS
	BICB	#MP.RTS,LB.MPS+1(J)	;REQUEST TO SEND IS NOW ENABLED
	MOV	#DHFILL,LB.SXR(J)	;SEND SYNC SEQ TO TIME MODEM TRANSITION
	MOV	#-FTASYN,LB.SXR+2(J)
.ENDC

DHXBG3:	JSR	PC,@LB.XDN(J)		;REFIL THE 2ND BUFFER
	MOV	R0,LB.SXR+4(J)
	MOV	R1,LB.SXR+6(J)
	BIS	#LS..XG,(J)		;SIGNAL XMITTER GOING
DHSXMT:	PIOFF
	MOV	LB.DHB(J),DH		;GET THE DH BLOCK ADR
	BIS	LB.BIT(J),DHBBAR(DH)	;AND SET THE XMITTER AS STARTED
	MOV	(DH),DH			; GET HARDWARE ADR
	BIC	#17,(DH)		;SET UP THE LINE IN THE DH
	BISB	LB..LN(J),(DH)
	MOV	LB.SXR(J),6(DH)		;SET THE XMIT BUFFER ADR
	MOV	LB.SXR+2(J),10(DH)	;SET THE XMIT COUNT
	BIC	LB.BIT(J),14(DH)	;BE SURE WE'RE NOT SENDING BREAK
	BIS	LB.BIT(J),12(DH)	;START THE XMITTER
	PION
	RTS	PC
;INPUT INTERRUPT SERVICE

DDDHIN:
DDHINS:	BIT	#LS..RG,(J)		;IF THE RECEIVER IS RUNNING
	BEQ	80$
	MOVB	R1,@LB.SRR(J)		;SAVE CHAR IN BUFFER
	INC	LB.SRR(J)		;ADVANCE THE BUFFER INDEX
	INC	LB.SRR+2(J)		;AND THE COUNT
	BNE	80$
	MOV	LB.SRR+4(J),LB.SRR(J)	;IF FULL, SET 2ND BUF AS FIRST
	MOV	LB.SRR+6(J),LB.SRR+2(J)
	BIC	#LS.SSY,(J)		;DON'T NEED TO STRIP SYNC ON A DH
	JSR	PC,@LB.RDN(J)		;SEND THE MSG SEG TO DDCMP
	MOV	R0,LB.SRR+4(J)		;SET THE NEW 2ND BUFFER
	MOV	R1,LB.SRR+6(J)
	TST	LB.SRR+2(J)		;IF NO BUFFER
	BNE	80$
	BIC	#LS..RG,(J)		;CLEAR THE RECEIVER GOING
	QUEPUT	QI 79$
80$:	RTS	PC



;OUTPUT INTERRUPT SERVICE

DDDHOU:
DDHOUS:	JSR	PC,DHXBG1		;START THE XMITTER
	TST	LB.SXR+2(J)		;IF NO BUFFER
	BNE	99$
.IF NE FT.MPT
	BIT	#LS.MPT,(J)		;IF MULTIPOINT
	BEQ	95$
	BITB	#MP.SEL,LB.MPS(J)	;AND IF NOT SELECTED
	BNE	95$
.IF NE FTTRIB
	TST	LB.MPL(J)		;AND THIS IS A TRIBUTARY
	BNE	90$
	BIS	#LS..XG,(J)		;SET XMITTER GOING FOR FILL
	MOV	#DHFILL,LB.SXR(J)
	MOV	#-FTASYN,LB.SXR+2(J)	;WE MUST SHUT OFF THE XMITTER
	MOV	LB.LCB(J),DH		;BUT FIRST TIME THE LAST TWO
	MOV	#DDHSTP,LC.OUS(DH)	;CHARS THAT THE HWD BUFFERED
	MOV	#DHSXMT,-(P)
.ENDC ;.IF NE FTTRIB
90$:	JSR	PC,DESLCT		;DESELECT THE STATION
.ENDC ;.IF NE FT.MPT
95$:	QUEPUT	QO 89$
99$:	RTS	PC
.IF NE FTTRIB

;SEND BREAK TO HALT THE XMITTER

DDHSTP:	JSR	R0,DMSTAT		;AND FIX DM11 LINE STATUS IF REQUIRED
	.BYTE	MP.RTS,0
	BISB	#MP.RTS,LB.MPS+1(J)	;REQUEST TO SEND IS NOW DISABLED
	MOV	LB.LCB(J),DH		;RETURN TO ORDINARY INTERRUPT SERVICE
	MOV	#DDHOUS,LC.OUS(DH)
	BIC	#LS..XG,(J)		;SET XMITTER AS STOPPED
	CLR	LB.SXR+2(J)
	RTS	PC



DHFILL:					; FILL CHARACTERS FOR DH TIMING
	.REPT	FTASYN
		.BYTE	-1
	.ENDR
	.EVEN


DMSTAT:	MOV	LB.DHB(J),DH		;GET THE DM11 HARDWARE ADR
	MOV	DHB.DM(DH),DH
	BEQ	30$			;IF NONE EXIT
	BIT	#LS.MPT,(J)		;IF MULTIPOINT
	BEQ	30$
	BITB	#MP.CMS,LB.MPS+1(J)	;AND IF CHANGE OF MODEM STATE ENABLED
	BEQ	30$
	BIS	#DM.SCN,(DH)		;CLEAR THE DM11 SCAN
	JSR	R0,DMWAIT		;AND WAIT FOR IT TO SETTLE
	TRAP				;DM11 BROKEN
	BISB	LB..LN(J),(DH)		;SET THE LINE NUMBER
	JSR	R0,DMWAIT		;AND WAIT AGAIN
	TRAP				;DM11 BROKEN
	TST	(DH)+			;GET THE ADDRESS OF THE LINE STATUS REGISTER
	BICB	(R0)+,(DH)		;CLEAR THE BITS
	BISB	(R0)+,(DH)		;AND SET THE BITS
	RTS	R0
30$:	TST	(R0)+			;DO NOTHING AT ALL
	RTS	R0
.ENDC ;.IF NE FTTRIB
.ENDC ;.IF NE NDHMPT!NADHLN!NDHTRB!RDPDHN!FT.MPT
.ENDC ;.IF NE FTDH11 FROM BEGINING OF DNDH11.P11