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MAINDEC-10-DAKDB






 
			IDENTIFICATION
			--------------

	PRODUCT CODE:	MAINDEC-10-DAKDB-B-D

	PRODUCT NAME:	DECSYSTEM10 PDP-10 KA10 RANDOM INSTRUCTION
			RELIABILITY DIAGNOSTIC

	VERSION:	0.2

	DATE RELEASED:	JANUARY 1977

	MAINTAINED BY:	DIAGNOSTIC ENGINEERING GROUP

	AUTHOR:		JOHN R. KIRCHOFF

COPYRIGHT(C) 1972,1977
DIGITAL EQUIPMENT CORPORATION
MARLBORO, MASS. 01752

THIS SOFTWARE IS FURNISHED UNDER A LICENSE FOR USE ONLY
ON A SINGLE COMPUTER SYSTEM AND MAY BE COPIED ONLY WITH
THE INCLUSION OF THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE,
OR ANY OTHER COPIES THEREOF, MAY NOT BE PROVIDED OR OTHERWISE
MADE AVAILABLE TO ANY OTHER PERSON EXECPT FOR USE ON SUCH SYSTEM
AND TO ONE WHO AGREES TO THESE LICENSE TERMS.  TITLE TO AND
OWNERSHIP OF THE SOFTWARE SHALL AT ALL TIMES REMAIN IN DEC.

THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT
NOTICE AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL
EQUIPMENT CORPORATION.

DEC ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DEC.
						MAINDEC-10-DAKDB.TXT
							PAGE 2


			TABLE OF CONTENTS
			-----------------

1.0	ABSTRACT

2.0	REQUIREMENTS

2.1	EQUIPMENT

2.2	STORAGE

2.3	PRELIMINARY PROGRAMS

3.0	PROGRAM PROCEDURES

3.1	LOADING PROCEDURE

3.2	STARTING PROCEDURE

3.3	OPERATING PROCEDURE

4.0	DATA SWITCH FUNCTIONS

5.0	ERRORS

6.0	ITERATION COUNTER

7.0	CYCLE TIME

8.0	OPERATIONAL VARIATIONS

9.0	DDT COMMANDS

10.0	MISCELLANEOUS

11.0	SIMULATOR

12.0	MISCELLANEOUS

13.0	LISTING
						MAINDEC-10-DAKDB.TXT
							PAGE 3

1.0	ABSTRACT

	THE RANDOM INSTRUCTION TEST IS DESIGNED TO EXPOSE PRO-
	CESSOR MALFUNCTIONS BY GENERATING AND EXECUTING RANDOM (NON
	PC-CHANGE) INSTRUCTIONS IN THE FAST ACCUMULATORS 11-16.  THE
	OPERANDS OF THESE INSTRUCTIONS REFERENCE ACCUMULATORS 0-7.  THE
	AC INSTRUCTION LOOP IS DUPLICATED IN NORMAL CORE MEMORY AND THE
	RESULTS COMPARED WITH THE FAST AC RESULTS IN AC 0-7.
	THE FAST AC LOOP IS ALSO SIMULATED AND THE SIMULATED RESULTS
	COMPARED WITH THE FAST AC RESULTS AND THE CORE MEMORY RESULTS.

	THE PROGRAM INCORPORATES DDT TO FACILITATE ERROR ISOLATION AND
	REPAIR.  CONTROL MAY BE TRANSFERED TO DDT AT ANY TIME BY TYPING
	AN ALT-MODE ($) ON THE TTY.

2.0	REQUIREMENTS

2.1	EQUIPMENT

	A PDP-10 KA10 EQUIPPED WITH A MINIMUM OF 32K OF MEMORY.
	PAPER TAPE READER
	CONSOLE TELETYPE
	DECTAPE (OPTIONAL)
	LINE PRINTER (OPTIONAL)

2.2	STORAGE

	PROGRAM RUNS WITHIN 32K.

2.3	PRELIMINARY PROGRAMS

	PROCESSOR DIAGNOSTICS
	MEMORY DIAGNOSTICS
						MAINDEC-10-DAKDB.TXT
							PAGE 4

3.0	PROGRAM PROCEDURES

3.1	LOADING PROCEDURE

	RUN VIA "DIAMON" OR "MAGMON".

3.2	STARTING PROCEDURE

	A.  SELECT OPERATIONAL CONSOLE DATA SWITCH SETTINGS (REFER TO
	    4.0 DATA SWITCH FUNCTIONS).

	B.  EXEC MODE
	    STAND ALONE STARTING ADDRESS IS 30000.
	    SPECIAL FEATURE START (CLEAR OPERATING TOTALS) IS 30004.

	C.  USER MODE

	    IN USER MODE THE FOLLOWING QUESTIONS WILL BE ASKED TO
	    SELECT THE OPERATIONAL SWITCHES:

		TELETYPE SWITCH CONTROL ? 0,S,Y OR N (CR) -

		IF THE OPERATOR TYPES "N", THE ACTUAL CONSOLE SWITCHES
		ARE USED.

		IF THE OPERATOR TYPES "Y", THE FOLLOWING:

		SPECIFY LH SWITCHES IN OCTAL -

		SPECIFY RH SWITCHES IN OCTAL -

		IF THE OPERATOR TYPES "0", ZERO'S ARE USED FOR THE 
		SWITCH SETTINGS.

		IF THE OPERATOR TYPES "S", PREVIOUSLY SET SWITCHES
		ARE USED.  THIS IS ONLY VALID UPON RESTARTING OF AN
		INTERRUPTED PROGRAM.

	D.  IF IT IS DESIRED TO SPECIFY THE INITIAL BASE RANDOM NUMBER
	    SET SWITCH 'RANBAS' (BEFORE STARTING) AND RESPOND TO THE
	    FOLLOWING TYPE-OUT ACCORDINGLY.

			SPECIFY RANDOM NUMBER BASE -
						MAINDEC-10-DAKDB.TXT
							PAGE 5

3.3	OPERATING PROCEDURE

	A.  TO THROUGHLY TEST ALL HARDWARE, ALL TEST CONTROL DATA SWITCHES
	    SHOULD BE SET TO 0.

	B.  WHEN DEBUGGING HARDWARE, SET SWITCHES TO 0.  ALLOW THE
	    TELETYPE TO PRINT THE ERROR MESSAGES.  THIS ALLOWS THE PRO-
	    GRAM TO RUN A COMPLETE PASS AND THEN THE ERROR MESSAGES
	    MAY BE CORRELATED TO QUICKLY DIAGNOSE THE FAILURE.  IF IT
	    IS DESIRED TO LOOP ON A FAILURE SET THE LOOP ON ERROR SWITCH.
	    THE FIRST FAILURE WILL THEN CAUSE THE PROGRAM TO ENTER A
	    LOOP SUITABLE FOR DEBUGGING.  TO PRINT ALL ERRORS, EVEN IN
	    A DEBUGGING LOOP, SET THE PRINT ALL ERRORS SWITCH.

	    THE ERROR MESSAGES USED IN CONJUNCTION WITH THE LISTING, DDT,
	    AND SCOPING IF NECESSARY SHOULD ALLOW THE FAILING COMPONENT
	    TO BE ISOLATED AND REPLACED AND/OR REPAIRED.

	C.  ERROR INFORMATION MAY BE OBTAINED QUICKLY BY PRINTING ERRORS
	    ON THE LINE PRINTER.

	D.  PFSTRT - 30005  ; TO RESTART PROGRAM AFTER POWER FAILURE.

	E.  START1 - 30013  ; TO CONTINUE PROGRAM WITHOUT INITIALIZING
	    RANDOM NUMBER GENERATOR.

	F.  START2 - 30014  ; TO CONTINUE EXECUTION OF A FAILING INSTRUCTION
	    LOOP.

	G.  DDT - DDT MAY BE ENTERED DIRECTLY UPON STARTING THE PROGRAM
	    BY SETTING SWITCH 18.  DDT MAY ALSO BE ENTERED DURING RUNNING
	    OF THE PROGRAM BY TYPING AN ALT-MODE ($) ON THE TTY.

	    STARTING ADDRESS OF DDT IS 30007(8).
						MAINDEC-10-DAKDB.TXT
							PAGE 6

4.0	DATA SWITCH FUNCTIONS
	---------------------

	LEFT HALF SWITCHES
	------------------
	SWITCH			STATE	FUNCTION
	------			-----	--------

	0 (400000)   ABORT	0	NORMAL
				1	ABORT AT END OF PASS

	1 (200000)   RSTART	0	CONTINUE OPERATION
				1	PRINT TOTALS, RESTART PROGRAM

	2 (100000)   TOTALS	0	NO FUNCTION
				1	PRINT TOTALS, CONTINUE PROGRAM

	3 (040000)   NOPNT	0	NORMAL TYPEOUT
				1	INHIBIT ALL PRINT/TYPEOUT
					(EXCEPT FORCED)

	4 (020000)   PNTLPT	0	NORMAL OUTPUT TO TTY
				1	PRINT ALL DATA ON LPT
					(LOGICAL DEVICE, USER MODE)

	5 (010000)   DING	0	NO FUNCTION
				1	RING BELL ON ERROR

	6 (004000)   LOOPER	0	PROCEED TO NEXT TEST
				1	ENTER LOOP ON TEST ERROR

	7 (002000)   ERSTOP	0	PROGRAM CONTINUES FROM ERROR
				1	HALT ON TEST ERROR

	8 (001000)   PALERS	0	PRINT ONLY FIRST ERROR WHEN LOOPING
				1	PRINT ALL ERRORS

	9 (000400)   RELIAB	0	FAST CYCLE MODE
				1	RELIABILITY MODE

	16 (000002)  KA50HZ	0	60 CYCLE POWER
				1	50 CYCLE POWER
						MAINDEC-10-DAKDB.TXT
							PAGE 7

4.0	DATA SWITCH FUNCTIONS (CON'T)
	-----------------------------

	RIGHT HALF SWITCHES
	-------------------
	SWITCH			STATE	FUNCTION
	------			-----	--------

	18 (400000)  ENTDDT	0	NO FUNCTION
				1	ENTER DDT UPON STARTING THE
					PROGRAM.

	19 (200000)  RANBAS	0	USE PROGRAM INITIAL RANDOM BASE.
				1	SPECIFY RANDOM NUMBER BASE BY OPERATOR
					RESPONSE TO PROGRAM REQUEST.

	26 (001000)  ALINES	0	NO FUNCTION
				1	PRINT ALL OUTPUT LINES.

	27 (000400)  INHSCT	0	NORMAL SIMULATION PRINTOUT.
				1	INHIBIT SIMULATION SCT2 & SCT3 PRINTOUT.

	28 (000200)  INHCLK	0	PROCESS CLOCK INTERRUPTS
				1	INHIBIT CLOCK INTERRUPTS

	29 (000100)  INHMT	0	PRINT INSTRUCTION SIMULATION MACHINE STATES.
				1	PRINT INSTRUCTION SIMULATION INITIAL/FINAL ONLY.

	34 (000002)  SNGFL	0	REPEAT FAST LOOP (10 TIMES)
				1	SINGLE FAST LOOP

	35 (000001)  INHSIM	0	NORMAL COMPARISIONS (FAST AC, CORE, SIM).
				1	INHIBIT SIMULATION COMPARISIONS.
						MAINDEC-10-DAKDB.TXT
							PAGE 8

5.0	ERRORS

	ERROR MESSAGES ARE PRINTED ON THE TTY OR LINE PRINTER.  THE
	ERROR MESSAGE CONTAINS THE FAILING INSTRUCTION GROUP, THE 
	ORIGINAL OPERANDS, THE FAST AC RESULT, THE CORE MEMORY
	RESULTS, THE INSTRUCTION SIMULATION, AND THE SIMULATED ANSWERS.

	IF THE LOOP ON ERROR SWITCH IS SET THE PROGRAM WILL CYCLE ON THE
	FAILING INSTRUCTION SEQUENCE IN AC'S 11 THRU 17.  FAILURE ANALYSIS
	MAY BE PERFORMED BY EXAMINING THE INSTRUCTIONS WITH DDT (ENTERED
	BY TYPING AN ALT-MODE ($) ON THE TTY) AND BY RESTARTING THE
	LOOP AT AN APPROPRIATE RESTART ADDRESS.

	NOTE:  IT IS POSSIBLE THAT ANY ONE OF THE INSTRUCTION SEQUENCES
	       MAY HAVE FAILED.  ANALYSIS OF THE ERROR MESSAGE
	       PRINTOUT IS REQUIRED TO DETERMINE THE ACTUAL CAUSE OF 
	       THE FAILURE.

	THE FOLLOWING EXAMPLE ERROR MESSAGE INDICATES AN INCORRECT
	RESULT IN FAST AC 2.

	----------
	RANDOM INSTRUCTION FAILURE	[SLOW ANS]	[SIM ANS]
	INST GROUP	 OPERANDS	 FAST ANS	 SLOW ANS
	11/546040000007  0/536461414037  0/536461414037  0/536461414037
	12/475300000006  1/475306407246  1/000000407246  1/000000407246
	13/553340000001  2/553756641571  2/00000000000   2/526272250404
	14/526240000004  3/526272250404  3/526272250404  3/526272250404
	15/154340000002  4/376775671572  4/204632777777  4/204632777777
	16/523100000002  5/523126204632  5/523126204632  5/523126204632
	17/   EXIT	 6/036370236031  6/777777777777  6/777777777777
		         7/116747224357  7/220422744160  7/220422744160

	RANDOM NUMBER BASE = 536461414037

	INSTRUCTION SIMULATION
	----------

		(INSTRUCTION SIMULATION OUTPUT, AS APPROPRIATE)
						MAINDEC-10-DAKDB.TXT
							PAGE 9

6.0	ITERATION COUNT

	THE ITERATION COUNT OF THE PROGRAM IS DISPLAYED IN THE MEMORY
	INDICATORS (MI).  THIS COUNT IS A DECREMENTING COUNT AND INITIALLY
	STARTS AT -1 IN STAND-ALONE OPERATION.

7.0	CYCLE TIME

	THIS PROGRAM IS A RELIABILITY TEST USING RANDOM NUMBERS AND 
	AS SUCH SHOULD BE RUN LONG ENOUGH TO INSURE THAT ENOUGH
	NUMBERS ARE PROCESSED TO VERIFY SYSTEM RELIABILITY.

8.0	OPERATIONAL VARIATIONS

	A.  DIAGNOSTIC MONITOR

	    THIS PROGRAM IS USABLE WITH THE DIAGNOTIC MONITOR TO
	    PROVIDE RELIABILITY TESTS, ACCEPTANCE TESTS, AND/OR TO
	    PROVIDE A QUICK METHOD OF ISOLATION OF A FAULT TO A
	    PARTICULAR AREA OF THE PROCESSOR.  CERTAIN PROCEDURES
	    ARE USED WHEN THE PROGRAM IS USED IN THIS MANNER.
	    THEY ARE:

	    1.  THE DIAGNOSTIC MONITOR TRANSFERS CONTROL TO THE 
		PROGRAM AND STARTS IT AT LOCATION 30002.

	    2.  MONCTL - LOCATION 30043 IS USED AS THE DIAGNOSTIC
	    	MONITOR CONTROL WORD.

			LH = 0, STAND ALONE OPERATION
			    -PASS COUNT, RUNNING UNDER DIAGNOSTIC MONITOR

			RH = RIGHT HALF OF CONSOLE SWITCHES IF UNDER
			     DIAGNOSTIC MONITOR CONTROL.
						MAINDEC-10-DAKDB.TXT
							PAGE 10

8.0	OPERATIONAL VARIATIONS (CON'T)

	B.  USER MODE

	    TO OUTPUT THE PRINTED ERROR MESSAGES TO A USER SPECIFIED
	    DEVICE IN USER MODE, ASSIGN THE DESIRED OUTPUT DEVICE
	    TO DEVICE NAME 'DEV' AND SET SWITCH 'PNTLPT'.  THE
	    PHYSICAL DEVICE USED CAN BE ANY DEVICE THAT CAN ACCEPT
	    ASCII OUTPUT FORMAT SUCH AS LPT, DSK, DTA, ETC.  THE
	    CORRESPONDING OUTPUT FILE IS 'DAKDB.TMP'.

	    EXAMPLE DEVICE ASSIGNMENT:

	    .ASSIGN DSK DEV

	    IN USER MODE THE PROGRAM WILL MAKE TWO PASSES AND THEN 
	    RETURN TO MONITOR MODE.

	    THE OUTPUT FILE (IF USED) MAY THEN BE LISTED BY USING THE
	    NORMAL MONITOR COMMANDS (R PRINT, LIST, TYPE, PIP, ETC.).

	    IF THE PROGRAM IS ABORTED BEFORE COMPLETION (BY ^C, ETC.)
	    THE OUTPUT FILE MAY BE CLOSED BY USING THE MONITOR 'REENTER'
	    COMMAND.

	C.  SYSTEM EXERCISER

	    STARTING ADDRESS IS 30003.  DATA SWITCHES ARE PRESTORED IN
	    'SWTEXR' LOCATION 30023.
						MAINDEC-10-DAKDB.TXT
							PAGE 11

9.0	DDT COMMANDS

	A.  TO SET A BREAKPOINT

	    UP TO 8 BREAKPOINTS MAY BE SET AT ANY ONE TIME.

	    ADR$B  ;SET A BREAKPOINT AT ADR. WHEN THE BREAKPOINT IS
	    REACHED, THE PROGRAM HALTS AND TYPES OUT $NB>>ADR

	B.  TO PROCEED FROM A BREAKPOINT HALT

	    $P  ;RESUME PROGRAM EXECUTION.
	    HALT AGAIN NEXT TIME THE BREAKPOINT IS ENCOUNTERED.
	    N$P  ;RESUME PROGRAM EXECUTION.
	    DO NOT HALT UNTIL THE NTH TIME BREAKPOINT IS ENCOUNTERED.

	C.  TO REMOVE A BREAKPOINT

	    $B  ;REMOVE ALL BREAKPOINTS

	D.  TO EXAMINE A LOCATION OR TO INSERT NEW DATA

	    ADR/ ;EXAMINE LOACATION SPECIFIED BY ADR.
	         CR CLOSES EXAMINED REGISTER
	         LF CLOSES AND EXAMINES ADR+1

	    ADR/ YYYY XXXX CR  ;EXAMINES ADR AND PLACES XXXX IN
	    LOCATION ADR AND CLOSES THE EXAMINED WORD.

	E.  TO START PROGRAM EXECUTION

	    ADR$G  ;START THE PROGRAM EXECUTION AT ADR.

	NOTE:  $ = ALT-MODE

10.0	MISCELLANEOUS

	THE NON-EX-MEMORY AND PARITY STOP SWITCHES SHOULD BE RESET
	(0).  THESE ERRORS, ILLEGAL UUO'S AND OTHER ERRORS OF THIS TYPE
	ARE HANDLED BY PRINTOUT ON THE TELETYPE.

	MARGINS - THE RANDOM NUMBER INSTRUCTION TEST SHOULD BE RUN WITH
	APPROPRIATE VOLTAGE MARGINS TO HELP INSURE PROCESSOR RELIABILITY.
						MAINDEC-10-DAKDB.TXT
						PAGE 12
11.0	SIMULATOR
	---------

	THE PDP-10 KA10 SIMULATOR IS USED TO SIMULATE THE ACTUAL 
	HARDWARE OPERATION OF THE PDP-10 KA10 CENTRAL PROCESSOR. THE
	PURPOSE OF THIS SIMULATION PROGRAM IS TO PROVIDE A
	MEANS OF HARDWARE DEVELOPMENT AND MACHINE CHECKOUT. THE
	SIMULATION PROGRAM MAY ALSO BE USED FOR DIAGNOSTIC PROGRAM
	DEVELOPMENT AND AS A PROGRAM OPERATION TRACE DEBUG SYSTEM. 
	THE SIMULATION IS ACCOMPLISHED THROUGH SOFTWARE BY USING PROGRAM
	ROUTINES TO FOLLOW THE HARDWARE OPERATION FLOW AND CORE MEMORY
	LOCATIONS AS PSEUDO HARDWARE REGISTERS.

	A. DDT PROGRAM TYPE-IN SIMULATION
	   ------------------------------

	TO USE THE SIMULATOR TO SIMULATE A SMALL PROGRAM TYPED-IN
	WITH DDT THE FOLLOWING PROCEDURE (EXAMPLE) IS USED.

	START PROGRAM WITH SWITCH 'ENTDDT' SET SO THAT CONTROL TRANSFERS
	TO DDT.

	*DDT*

	200!	A:	MOVE 0,300	;SAMPLE PROGRAM (DDT TYPIN)
	A+1!	FAD	0,302
	A+2!	HALT
	300!	1.0
	301!	0
	302!	3.0
	303!	0

	INPC!	200		;STARTING ADDRESS
	MASK!	0		;ALLOW ALL INST TO PRINT
	INSTR!	0		;ALLOW ALL INST TO PRINT
	CNPLPC!	0		;ALLOW SIMULATION TO START AT 0
	UPRPC!	777777		;CONTINUE TO 77777.

	SIMDDT$G		;TRANSFER TO SIMULATOR

	INPC =   RIGHT HALF IS OBJECT PROGRAM STARTING ADDRESS
		 LEFT HALF = 0 = EXEC MODE OBJECT PROGRAM
			   =10000 = USER MODE OBJECT PROGRAM

	MASK =   WORD TO ALLOW CHECKING OF ONLY DESIRED INSTRUCTION CODE
		 BITS TO DETERMINE INSTRUCTION SIMULATION PRINTOUT.

	INSTR = WORD TO FURTHER SELECT INSTRUCTIONS TO BE PRINTED.

	CNTLPC = WORD USED TO PREVENT SIMULATION PRINTOUT UNTIL THE
		 OBJECT PROGRAM PC IS EQUAL OR GREATER.

	UPRPC = WORD USED TO PREVENT SIMULATION PRINTOUT WHEN THE
		OBJECT PROGRAM PC IS GREATER THAN.
						MAINDEC-10-DAKDB.TXT
						PAGE 13

	B.  SIMULATOR PRINT PROGRAM
	    -----------------------

	THE SIMULATOR PRINT PROGRAM PROVIDES A POINT IN THE MAIN
	SIMULATOR AT WHICH TIME TRANSFER IS MADE TO  THE SIMULATOR
	PRINT PROGRAM.  THE PRINT PROGRAM THEN DETERMINES IF THE
	INSTRUCTION IS TO BE PRINTED. DONE BY MASKING THE INSTRUCTION
	CODE BITS WITH THE WORD 'MASK' AND THEN FURTHER DELIMITING THE
	INSTRUCTION BY A 'CAME' INSTRUCTION WITH THE WORD 'INSTR'. 
	THE PC OF THE INSTRUCTION IS ALSO CHECKED AGAINST 'CNTLPC' AND
	'UPRPC' AND MUST BE BETWEEN THIS RANGE TO BE PRINTED.

	AN EXAMPLE TO PRINT SIMULATION OF THE INSTRUCTIONS IN THE RANGE
	100 TO 177 WOULD BE:

		MASK=700000,,0
		INSTR=100000,,0
		CNTLPC=0,,0
		UPRPC=0,,-1

	IF THE INSTRUCTION PASSES THESE TESTS THE PRINT CONTROL IS SET
	ACCORDINGLY.  THE INSTRUCTION IS SIMULATED AND THE PC,
	INSTRUCTION AND THE INITIAL/FINAL RESULTS PRINTED.  THE 
	INSTRUCTION IS THEN RESIMULATED AND THE MACHINE STATES PRINTED
	(IF CALLED FOR BY SW29, PNTMS).  AT THE COMPLETION OF EACH
	TIME STATE SIMULATION, TRANSFER IS MADE TO THE PRINT PROGRAM
	AND THE PSEUDO MACHINE STATE AND REGISTERS PRINTED.
						MAINDEC-10-DAKDB.TXT
						PAGE 14

	C.  MAIN SIMULATOR
	    --------------

	THIS SECTION PERFORMS THROUGH SOFTWARE ROUTINES AND PSEUDO
	HARDWARE REGISTERS THE ACTUAL HARDWARE OPERATION OF THE KA10
	CENTRAL PROCESSOR. THE ACTUAL OPERATION OF THIS SECTION IS
	DESCRIBED IN THE KA10 HARDWARE FLOW CHARTS AND SYMBOLIC TAGS,
	REGISTERS, FLAGS, ETC. ARE ALL AS LISTED ON THE FLOW CHARTS.

	  START SIMULATION USING DDT BY TYPING:

	    NNNNN$G	;NNNNN MAY BE ABSOLUTE (IN OCTAL), OR SYMBOLIC

	    IF NOT USING DDT START SIMULATION BY USING ADDRESS
	    SWITCHES:

	    STARTING ADDRESSES ARE:

		1.  SIMPRG = SIMULATE COMPLETE PROGRAM, PRINT MACHINE 
			     TIMES OF SELECTED INSTRUCTIONS.

		2.  SIMMS =  SIMULATE AND PRINT MEMORY STOP TIMES OF
		     	     SELECTED INSTRUCTIONS

		3.  SIMIF =  SIMULATE AND PRINT INITIAL/FINAL STATES
			     OF SELECTED INSTRUCTIONS

		4.  SMMT1 =  SIMULATE AND PRINT MACHINE TIMES FOR
			     ONE INSTRUCTION
				( USE DDT GO ADR$X )

		5.  SMNST1 = SIMULATE SINGLE INSTRUCTION
				( USE DDT GO ADR$X )

	THE USAGE PROCEDURE IS DETERMINED BY THE DESIRED USE OF
	THE SIMULATOR, SOME SAMPLE USES ARE:

	    A.  INSTRUCTION CHECKOUT
	    B.  PROGRAM TRACE
	    C.  HARDWARE DEVELOPMENT
					MAINDEC-10-DAKDB.TXT
					PAGE 15

11.1	INITIALIZATION
	--------------

	THE INITIALIZATION ROUTINE CLEARS CERTAIN REGISTERS, SETS UP
	THE UUO TRAP, SETS UP THE PUSH DOWN LIST, AND INITIALIZES
	THE PRINTOUT IN EXEC OR USER MODE.

11.2	PROGRAM SIMULATION, MACHINE TIMES PRINTOUT (SIMPRG)
	------------------------------------------

	THIS PROGRAM SIMULATION ENTRY TO THE SIMULATOR ALLOWS AN
	OBJECT PROGRAM TO BE SIMULATED AND ALL OR ONLY
	SELECTED INSTRUCTIONS TO HAVE THE HARDWARE MACHINE
	TIMES PRINTED. TO PRINT ONLY SELECTED INSTRUCTIONS
	"MASK" AND "INSTR" ARE SET UP TO SELECT THE DESIRED
	INSTRUCTIONS. REFER TO 3.3. THE ROUTINE OPERATES
	BY CHECKING THE INSTRUCTION FOR PRINTING AND SETS UP THE
	PRINT CONTROL ACCORDINGLY; SIMULATE THE INSTRUCTION PRINTING
	INITIAL AND FINAL RESULTS IF REQUESTED; RESIMULATE THE 
	INSTRUCTION PRINTING MACHINE TIMES IF PRINTING WAS REQUESTED,
	THEN CONTINUE PROCESSING THE NEXT INSTRUCTION IN THE OBJECT
	PROGRAM IN THE SAME MANNER.

11.3	PROGRAM SIMULATION, MEMORY STOP TIMES PRINTOUT (SIMMS)
	----------------------------------------------

	THIS PROGRAM SIMULATION ENTRY TO THE SIMULATOR PERFORMS 
	AS GIVEN IN 5.2 EXCEPT THAT THE PRINT CONTROL IS SUCH
	THAT ONLY THE HARDWARE MACHINE STATES THAT CORRESPOND TO
	MEMORY STOPS ARE PRINTED DURING THE MACHINE STATES 
	PRINTOUT.
						MAINDEC-10-DAKDB.TXT
						PAGE 16


11.4	PROGRAM SIMULATION, INITIAL/FINAL PRINTOUT (SIMIF)
	------------------------------------------

	THIS PROGRAM SIMULATION ENTRY TO THE SIMULATOR IS USED TO
	PRINT ONLY THE INITIAL AND FINAL RESULTS OF THE INSTRUCTIONS
	IN THE OBJECT PROGRAM. THIS MODE IS THEREFOR USEFUL FOR
	PROGRAM OPERATION TRACING. SELECTED INSTRUCTIONS IN THE OBJECT
	PROGRAM ARE SIMULATED.

11.5	SINGLE INSTRUCTION SIMULATION, NO PRINTOUT (SMNST1)
	------------------------------------------

	THIS MODE OF OPERATION OF THE SIMULATOR IS USED IN CONJUNCTION
	WITH DIAGNOSTIC AND RELIABILITY PROGRAMS TO COMPARE THE
	ACTUAL MACHINE INSTRUCTION RESULTS WITH THE SIMULATED RESULTS.
	THE SIMULATOR IS CALLED BY THE OBJECT PROGRAM.
	AS LONG AS THE RESULTS AGREE, THE OBJECT PROGRAM INSTRUCTIONS
	ARE OPERATING CORRECTLY AND THE OBJECT PROGRAM CAN CONTINUE.
	IF THE RESULTS DISAGREE THE INSTRUCTION CAN BE AGAIN SIMULATED,
	THIS TIME USING THE NEXT MODE (11.6).

11.6	SINGLE INSTRUCTION SIMULATION, MACHINE TIMES PRINTOUT (SMMT1)
	-----------------------------------------------------

	THIS MODE OF OPERATION OF THE SIMULATOR IS USED TO PROVIDE 
	THE INITIAL/FINAL AND MACHINE TIMES PRINTOUT OF A FAILING
	INSTRUCTION IN THE OBJECT PROGRAM. THIS PRINTOUT CAN THEN 
	BE USED IN CONJUNCTION WITH A FAILING LOOP IN THE OBJECT PROGRAM
	TO COMPARE THE ACTUAL REGISTER STATES WITH THE PRINTOUT BY
	USE OF THE SINGLE CYCLE AND SC MAINT SWITCHES. THIS MODE OF 
	SIMULATOR OPERATION IS ALSO CALLED BY THE OBJECT 
	PROGRAM.
						MAINDEC-10-DAKDB.TXT
						PAGE 17
11.7	SOFTWARE PSEUDO REGISTERS/CONTROL FLAGS
	---------------------------------------
	ACCUMULATORS
	------------
	0-			-TEMPORARY
	1-	TEMP		-TEMPORARY
	2-	SCAD		-SHIFT COUNT ADDER
	3-	AD		-ADDER
	4-	CE		-CONTENTS OF E
	5-	CAC		-CONTENTS OF AC
	6-	CAC1		-CONTENTS OF AC1
	7-	IR		-INSTRUCTION REGISTER
	10-	LH=FE/RH=SC	-FE-FLOAT EXP, SC-SHIFT COUNTER
	11-	MA		-LH=MISC BITS, IDX REG/RH=18 BIT MEMORY ADR(SEE MA SWITCHES)
	12-	PC		-LH=MISC BITS, IDX REG/RH=18 BIT PROGRAM COUNTER (SEE PC SWITCHES)
	13-	BR		-BUFFER REGISTER
	14-	AR		-ARITHMETIC REGISTER
	15-	MQ		-MULTIPLIER-QUOTIENT REGISTER
	16-	USER		-FIRST LOC IN OBJECT PROGRAM
	17-	PL		-PUSH DOWN LIST POINTER

	MA SWITCHES
	-----------
	0-	PALL		-PRINT ALL CONTROL
	1-	MS		-PRINT AT MEMORY STOP
	2-	SU		-STORE IN USER LOCATION
	3-	EXCTF		-FLOP-PREVENT FOLLOWING IT0 FROM CHANGING MA
	4-	EUUOF		-FLOP-CAUSE FOLLOWING IT0 TO SET MA35
	5-	FMEN		-FAST MEMORY ENABLE
	6-	ERR		-ERROR FLAG
	7-	NRF1		-NORMALIZE RETURN ROUNDING CONTROL FLOP
	8-	EXSYNC		-EX MODE SYNC
	9-	RUN		-RUN FLOP
	10-	HEAD		-PRINT HEADER CONTROL
	11-	MPF2		-MULTIPLY SIGN STORAGE
	12-	DSF7		-DIVIDEND ORIGINAL SIGN STORAGE

	PC SWITCHES
	-----------
	0-	AROV		-OVERFLOW
	1-	CRY0		-CARRY 0
	2-	CRY1		-CARRY 1
	3-	FOV		-FLOATING OVERFLOW
	4-	BIS		-BYTE INCREMENT STATUS FLAG
	5-	USERF		-USER MODE
	6-	EXIOT		-USER IN-OUT
	7-
	8-
	9-
	10-
	11-	FXU		-FLOATING UNDERFLOW
	12-	DCK		-DIVIDE CHECK
						MAINDEC-10-DAKDB.TXT
						PAGE 18



	INITIAL/FINAL SWITCHES
	----------------------

	0-	FCE		-FETCH C(E), AT FT0 BY MC RD RQ
	1-	FCEPSE		-FETCH C(E) PAUSE, AT FT1 BY MC RD/WR RQ
	2-	FACINH		-FETCH AC INHIBIT, CAUSES (AC) FETCH TO BE BYPASSED
	3-	FAC2		-FETCH AC2, CAUSES FETCH OF (AC+1) AT FT5
	4-	FCCLT		-FETCH C(C(AC) LEFT, LH OF AC USED AS ADR AT FT7
	5-	FCCRT		-FETCH C(C(AC) RIGHT, RH OF AC USED AS ADR AT FT7
	6-	SAC2		-STORE AC2, WRITE MQ INTO AC+1
	7-	SCE		-STORE C(E), WRITE AR INTO (MA)
	8-	SACINH		-STORE AC INHIBIT, PREVENTS STORAGE OF AR
	9-	SARBR		-WRITE AR INTO (AC), BR INTO (MA)
	10-	SACZ		-INHIBIT STORING RESULTS IN AC0
	11-	PCINH		-PC INCREMENT INHIBIT, AT FT9

	MEMORY REGISTERS	
	----------------

	MASK	-		INSTRUCTION PRINTOUT SELECTION MASK
	INSTR	-		INSTRUCTION PRINTOUT SELECTION COMPARISION WORD
	RELOC	-		RELOCATION FACTOR
	JA	-		JOB STORAGE AREA, BLOCK 200
	ACS	-		ACCUMULATOR'S, 1ST PART OF JA

12.0	MISCELLANEOUS
	-------------


13.0	LISTING
	-------