Enter your search terms Submit search form
	Web pdp-10.trailing-edge.com

	TITLE	MSTCKS - COMPUTE MONITOR SYMBOL TABLE CHECKSUM
	SUBTTL	G.M. UHLER/GMU


	SEARCH	JOBDAT,MACTEN,UUOSYM,SNUP
	.REQUIRE SNUP
	SALL

	T1==1
	T2==2
	T3==3
	T4==4
	P==17
	PDLLEN==50


	MONREF	MSTCKS
	BRKPNT	SYSCRH
START:	JFCL			;NO CCL ENTRY
	RESET			;RESET EVERYTHING
	MOVE	P,[IOWD PDLLEN,PDL] ;SETUP A PDL
	PUSHJ	P,GETINF##	;DEFINE THE BREAKPOINTS
	MOVE	T1,MSTCKS	;GET THE ADDRESS OF MSTCKS
	PEEK	T1,		;GET THE OLD VALUE
	MOVEM	T1,OLDSUM	;SAVE OLD VALUE OF CHECKSUM
	OUTSTR	[ASCIZ/[Current monitor symbol table checksum = /]
	MOVE	T1,OLDSUM	;GET THE CHECK SUM
	PUSHJ	P,.TXWDW	;TYPE AS HALF WORDS
	OUTSTR	[ASCIZ/]
/]
	OUTSTR	[ASCIZ/[Computed monitor symbol table checksum = /]
	MOVE	T1,CHKSUM	;GET THE CHECK SUM
	PUSHJ	P,.TXWDW	;TYPE AS HALF WORDS
	OUTSTR	[ASCIZ/]
/]
	MOVE	T1,OLDSUM	;GET CURRENT MONITOR CHECKSUM
	CAMN	T1,CHKSUM	;DIFFERENT FROM COMPUTED VALUE?
	JRST	DONE		;NO, JUST FINISH UP AND EXIT
	MOVE	T1,[3,,T2]	;SETUP ARG FOR POKE
	MOVE	T2,MSTCKS	;GET ADDRESS TO POKE
	MOVE	T3,OLDSUM	;GET OLD VALUE OF CHECKSUM
	MOVE	T4,CHKSUM	;GET NEW VALUE OF CHECKSUM
	POKE.	T1,		;CHANGE THE VALUE
	  JRST	[OUTSTR	[ASCIZ/?POKE. failed to change the value
/]
		 JRST	DONE]
	OUTSTR	[ASCIZ/[Monitor value changed]
/]
DONE:	RESET
	MONRT.
	JRST	.-1


.TXWDW:	PUSH	P,T1		;PRESERVE ARGUMENT
	HLRZ	T1,T1
	PUSHJ	P,.TOCTW
	OUTSTR	[ASCIZ/,,/]
	POP	P,T1		;RESTORE ARGUMENT
	HRRZ	T1,T1
.TOCTW:	MOVEI	T3,10		;INITIALIZE FOR OCTAL RADIX
TRDXW1:	IDIV	T1,T3		;DIVIDE BY RADIX
	MOVMS	T2		;GET MAGNITUDE
	HRLM	T2,(P)		;SAVE REMAINDER
	SKIPE	T1		;SEE IF ANYTHING LEFT
	PUSHJ	P,TRDXW1	;YES--LOOP BACK WITH PD LIST
	HLRZ	T1,(P)		;GET BACK A DIGIT
	ADDI	T1,"0"		;CONVERT TO ASCII
	CAILE	T1,"9"		;SEE IF OVERFLOW DIGITS
	ADDI	T1,"A"-"9"-1	;YES--SWITCH TO ALPHABETICS
	OUTCHR	T1
	POPJ	P,

PDL:	BLOCK	PDLLEN
OLDSUM:	BLOCK	1

	END	START