519 lines
14 KiB
ArmAsm
519 lines
14 KiB
ArmAsm
# Copyright: Public domain.
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# Filename: AGC_BLOCK_TWO_SELF-CHECK.agc
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# Purpose: Part of the source code for Colossus 2A, AKA Comanche 055.
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# It is part of the source code for the Command Module's (CM)
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# Apollo Guidance Computer (AGC), for Apollo 11.
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# Assembler: yaYUL
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# Contact: Ron Burkey <info@sandroid.org>.
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# Website: www.ibiblio.org/apollo.
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# Pages: 1394-1403
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# Mod history: 2009-05-10 SN (Sergio Navarro). Started adapting
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# from the Colossus249/ file of the same
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# name, using Comanche055 page images.
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#
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# This source code has been transcribed or otherwise adapted from digitized
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# images of a hardcopy from the MIT Museum. The digitization was performed
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# by Paul Fjeld, and arranged for by Deborah Douglas of the Museum. Many
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# thanks to both. The images (with suitable reduction in storage size and
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# consequent reduction in image quality as well) are available online at
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# www.ibiblio.org/apollo. If for some reason you find that the images are
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# illegible, contact me at info@sandroid.org about getting access to the
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# (much) higher-quality images which Paul actually created.
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#
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# Notations on the hardcopy document read, in part:
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#
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# Assemble revision 055 of AGC program Comanche by NASA
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# 2021113-051. 10:28 APR. 1, 1969
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#
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# This AGC program shall also be referred to as
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# Colossus 2A
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# Page 1394
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# PROGRAM DESCRIPTION DATE: 20 DECEMBER 1967
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# PROGRAM NAME -- SELF-CHECK LOG SECTION: AGC BLOCK TWO SELF-CHECK
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# MOD NO -- 1 ASSEMBLY SUBROUTINE UTILITYM REV 25
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# MOD BY -- GAUNTT
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#
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# FUNCTIONAL DESCRIPTION
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# PROGRAM HAS TWO MAIN PARTS. THE FIRST IS SELF-CHECK WHICH RUNS AS A ZERO PRIORITY JOB WITH NO CORE SET, AS
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# PART OF THE BACK-UP IDLE LOOP. THE SECOND IS SHOW-BANKSUM WHICH RUNS AS A REGULAR EXECUTIVE JOB WITH ITS OWN
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# STARTING VERB.
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#
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# THE PURPOSE OF SELF-CHECK IS TO CHECK OUT VARIOUS PARTS OF THE COMPUTER AS OUTLINED BELOW IN THE OPTIONS.
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#
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# THE PURPOSE OF SHOW-BANKSUM IS TO DISPLAY THE SUM OF EACH BANK, ONE AT A TIME.
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#
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# IN ALL THERE ARE 7 POSSIBLE OPTIONS IN THIS BLOCK II VERSION OF SELF-CHECK. MORE DETAIL DESCRIPTION MAY BE
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# FOUND IN E-2065 BLOCK II AGC SELF-CHECK AND SHOW BANKSUM BY EDWIN D. SMALLY DECEMBER 1966, AND ADDENDA 2 AND 3.
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#
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# THE DIFFERENT OPTIONS ARE CONTROLLED BY PUTTING DIFFERENT NUMBERS IN THE SMODE REGISTER (NOUN 27). BELOW IS
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# A DESCRIPTION OF WHAT PARTS OF THE COMPUTER THAT ARE CHECKED BY THE OPTIONS, AND THE CORRESPONDING NUMBER, IN
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# OCTAL, TO LOAD INTO SMODE.
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# +-4 ERASABLE MEMORY
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# +-5 FIXED MEMORY
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# +-1,2,3,6,7,10 EVERYTHING IN OPTIONS 4 AND 5.
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# -0 SAME AS +-10 UNTIL AN ERROR IS DETECTED.
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# +0 NO CHECK, PUTS COMPUTER INTO THE BACKUP IDLE LOOP.
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#
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# WARNINGS
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# USE OF E MEMORY RESERVED FOR SELF-CHECK (EVEN IN IDLE LOOP) AS TEMP STORAGE BY OTHER PROGRAMS IS DANGEROUS.
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# SMODE SET GREATER THAN OCT 10 PUTS COMPUTER INTO BACKUP IDLE LOOP.
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#
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# CALLING SEQUENCE
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# TO CALL SELF-CHECK KEY IN
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# V 21 N 27 E OPTION NUMBER E
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# TO CALL SHOW-BANKSUM KEY IN
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# V 91 E DISPLAYS FIRST BANK
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# V 33 E PROCEED, DISPLAYS NEXT BANK
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#
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# EXIT MODES, NORMAL AND ALARM
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# SELF-CHECK NORMALLY CONTINUES INDEFINITELY UNLESS THERE IS AN ERROR DETECTED. IF SO + OPTION NUMBERS PUT
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# COMPUTER INTO BACKUP IDLE LOOP, - OPTION NUMBERS RESTART THE OPTION.
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#
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# THE -0 OPTION PROCEEDS FROM THE LINE FOLLOWING THE LINE WHERE THE ERROR WAS DETECTED.
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#
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# SHOW-BANKSUM PROCEEDS UNTIL A TERMINATE IS KEYED IN (V 34 E). THE COMPUTER IS PUT INTO THE BACKUP IDLE LOOP.
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#
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# OUTPUT
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# Page 1395
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# SELF-CHECK UPON DETECTING AN ERROR LOADS THE SELF-CHECK ALARM CONSTANT (01102) INTO THE FAILREG SET AND
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# TURNS ON THE ALARM LIGHT. THE OPERATOR MAY THEN DISPLAY THE THREE FAILREGS BY KEYING IN V 05 N 09 E. FOR FURTHER
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# INFORMATION HE MAY KEY IN V 05 N 08 E, THE DSKY DISPLAY IN R1 WILL BE ADDRESS+1 OF WHERE THE ERROR WAS DETECTED,
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# IN R2 THE BBCON OF SELF-CHECK, AND IN R3 THE TOTAL NUMBER OF ERRORS DETECTED BY SELF-CHECK SINCE THE LAST MAN
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# INITIATED FRESH START (SLAP1).
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#
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# SHOW-BANKSUM STARTING WITH BANK 0 DISPLAYS IN R1 THE BANK SUM (A +-NUMBER EQUAL TO THE BANK NUMBER), IN R2
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# THE BANK NUMBER, AND IN R3 THE BUGGER WORD.
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#
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# ERASABLE INITIALIZATION REQUIRED
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# ACCOMPLISHED BY FRESH START
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# SMODE SET TO +0
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#
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# DEBRIS
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# ALL EXITS FROM THE CHECK OF ERASABLE (ERASCHK) RESTORE ORIGINAL CONTENTS TO REGISTERS UNDER CHECK.
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# EXCEPTION IS A RESTART. RESTART THAT OCCURS DURING ERASCHK RESTORES ERASABLE, UNLESS THERE IS EVIDENCE TO DOUBT
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# E MEMORY, IN WHICH CASE PROGRAM THEN DOES A FRESH START (DOFSTART).
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BANK 25
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SETLOC SELFCHEC
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BANK
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COUNT 43/SELF
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SBIT1 EQUALS BIT1
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SBIT2 EQUALS BIT2
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SBIT3 EQUALS BIT3
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SBIT4 EQUALS BIT4
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SBIT5 EQUALS BIT5
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SBIT6 EQUALS BIT6
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SBIT7 EQUALS BIT7
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SBIT8 EQUALS BIT8
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SBIT9 EQUALS BIT9
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SBIT10 EQUALS BIT10
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SBIT11 EQUALS BIT11
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SBIT12 EQUALS BIT12
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SBIT13 EQUALS BIT13
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SBIT14 EQUALS BIT14
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SBIT15 EQUALS BIT15
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S+ZERO EQUALS ZERO
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S+1 EQUALS BIT1
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S+2 EQUALS BIT2
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S+3 EQUALS THREE
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S+4 EQUALS FOUR
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S+5 EQUALS FIVE
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# Page 1396
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S+6 EQUALS SIX
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S+7 EQUALS SEVEN
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S8BITS EQUALS LOW8 # 00377
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CNTRCON = OCT50 # USED IN CNTRCHK
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ERASCON1 OCTAL 00061 # USED IN ERASCHK
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ERASCON2 OCTAL 01373 # USED IN ERASCHK
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ERASCON6 = OCT1400 # USED IN ERASCHK
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ERASCON3 OCTAL 01461 # USED IN ERASCHK
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ERASCON4 OCTAL 01773 # USED IN ERASCHK
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S10BITS EQUALS LOW10 # 01777, USED IN ERASCHK
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SBNK03 EQUALS PRIO6 # 06000, USED IN ROPECHK
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-MAXADRS = HI5 # FOR ROPECHK
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SIXTY OCTAL 00060
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SUPRCON OCTAL 60017 # USED IN ROPECHK
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S13BITS OCTAL 17777
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CONC+S1 OCTAL 25252 # USED IN CYCLSHFT
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CONC+S2 OCTAL 52400 # USED IN CYCLSHFT
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ERASCON5 OCTAL 76777
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S-7 = OCT77770
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S-4 EQUALS NEG4
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S-3 EQUALS NEG3
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S-2 EQUALS NEG2
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S-1 EQUALS NEGONE
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S-ZERO EQUALS NEG0
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EBANK= LST1
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ADRS1 ADRES SKEEP1
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SELFADRS ADRES SELFCHK # SELFCHK RETURN ADDRESS. SHOULD BE PUT
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# IN SELFRET WHEN GOING FROM SELFCHK TO
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# SHOWSUM AND PUT IN SKEEP1 WHEN GOING
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# FROM SHOWSUM TO SELF-CHECK.
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PRERRORS CA ERESTORE # IS IT NECESSARY TO RESTORE ERASABLE
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EXTEND
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BZF ERRORS # NO
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EXTEND
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DCA SKEEP5
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INDEX SKEEP7
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DXCH 0000 # RESTORE THE TWO ERASABLE REGISTERS
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CA S+ZERO
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TS ERESTORE
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ERRORS INHINT
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CA Q
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TS SFAIL # SAVE Q FOR FAILURE LOCATION
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TS ALMCADR # FOR DISPLAY WITH BBANK AND ERCOUNT
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INCR ERCOUNT # KEEP TRACK OF NUMBER OF MALFUNCTIONS.
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TCALARM2 TC ALARM2
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OCT 01102 # SELF-CHECK MALFUNCTION INDICATOR
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CCS SMODE
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SIDLOOP CA S+ZERO
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# Page 1397
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TS SMODE
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TC SELFCHK # GO TO IDLE LOOP
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TC SFAIL # CONTINUE WITH SELF-CHECK
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-1CHK CCS A
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TCF PRERRORS
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TCF PRERRORS
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CCS A
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TCF PRERRORS
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TC Q
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SMODECHK EXTEND
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QXCH SKEEP1
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TC CHECKNJ # CHECK FOR NEW JOB
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CCS SMODE
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TC SOPTIONS
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TC SMODECHK +2 # TO BACKUP IDLE LOOP
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TC SOPTIONS
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INCR SCOUNT
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TC SKEEP1 # CONTINUE WITH SELF-CHECK
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SOPTIONS AD S-7
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EXTEND
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BZMF +2 # FOR OPTIONS BELOW NINE.
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BNKOPTN TC SIDLOOP # ILLEGAL OPTION. GO TO IDLE LOOP.
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INCR SCOUNT # FOR OPTIONS BELOW NINE.
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AD S+7
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INDEX A
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TC SOPTION1
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SOPTION1 TC SKEEP1 # WAS TC+TCF
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SOPTION2 TC SKEEP1 # WAS IN:OUT1
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SOPTION3 TC SKEEP1 # WAS COUNTCHK
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SOPTION4 TC ERASCHK
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SOPTION5 TC ROPECHK
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SOPTION6 TC SKEEP1
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SOPTION7 TC SKEEP1
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SOPTON10 TC SKEEP1 # CONTINUE WITH SELF-CHECK
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CHECKNJ EXTEND
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QXCH SELFRET # SAVE RETURN ADDRESS WHILE TESTING NEWJOB
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TC POSTJUMP # TO SEE IF ANY JOBS HAVE BECOME ACTIVE.
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CADR ADVAN
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SELFCHK TC SMODECHK # ** CHARLEY, COME IN HERE
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# SKEEP7 HOLDS LOWEST OF TWO ADDRESSES BEING CHECKED.
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# SKEEP6 HOLDS B(X+1).
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# SKEEP5 HOLDS B(X).
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# SKEEP4 HOLDS C(EBANK) DURING ERASLOOP AND CHECKNJ
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# Page 1398
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# SKEEP3 HOLDS LAST ADDRESS BEING CHECKED (HIGHEST ADDRESS).
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# SKEEP2 CONTROLS CHECKING OF NON-SWITCHABLE ERASABLE MEMORY WITH BANK NUMBERS IN EB.
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#
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# ERASCHK TAKES APPROXIMATELY 7 SECONDS.
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ERASCHK CA S+1
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TS SKEEP2
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0EBANK CA S+ZERO
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TS EBANK
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CA ERASCON3 # 01461
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TS SKEEP7 # STARTING ADDRESS
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CA S10BITS # 01777
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TS SKEEP3 # LAST ADDRESS CHECKED
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TC ERASLOOP
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E134567B CA ERASCON6 # 01400
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TS SKEEP7 # STARTING ADDRESS
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CA S10BITS # 01777
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TS SKEEP3 # LAST ADDRESS CHECKED
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TC ERASLOOP
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2EBANK CA ERASCON6 # 01400
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TS SKEEP7 # STARTING ADDRESS
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CA ERASCON4 # 01773
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TS SKEEP3 # LAST ADDRESS CHECKED
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TC ERASLOOP
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NOEBANK TS SKEEP2 # +0
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CA ERASCON1 # 00061
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TS SKEEP7 # STARTING ADDRESS
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CA ERASCON2 # 01373
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TS SKEEP3 # LAST ADDRESS CHECKED
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ERASLOOP INHINT
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CA EBANK # STORES C(EBANK)
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TS SKEEP4
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EXTEND
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NDX SKEEP7
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DCA 0000
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DXCH SKEEP5 # STORES C(X) AND C(X+1) IN SKEEP6 AND 5.
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CA SKEEP7
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TS ERESTORE # IF RESTART, RESTORE C(X) AND C(X+1)
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TS L
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INCR L
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NDX A
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DXCH 0000 # PUTS OWN ADDRESS IN X AND X +1
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NDX SKEEP7
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CS 0001 # CS X+1
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NDX SKEEP7
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AD 0000 # AD X
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TC -1CHK
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CA ERESTORE # HAS ERASABLE BEEN RESTORED
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# Page 1399
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EXTEND
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BZF ELOOPFIN # YES, EXIT ERASLOOP.
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EXTEND
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NDX SKEEP7
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DCS 0000 # COMPLEMENT OF ADDRESS OF X AND X+1
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NDX SKEEP7
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DXCH 0000 # PUT COMPLEMENT OF ADDRESS OF X AND X+1
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NDX SKEEP7
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CS 0000 # CS X
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NDX SKEEP7
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AD 0001 # AD X+1
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TC -1CHK
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CA ERESTORE # HAS ERASABLE BEEN RESTORED
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EXTEND
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BZF ELOOPFIN # YES, EXIT ERASLOOP.
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EXTEND
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DCA SKEEP5
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NDX SKEEP7
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DXCH 0000 # PUT B(X) AND B(X+1) BACK INTO X AND X+1
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CA S+ZERO
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TS ERESTORE # IF RESTART, DO NOT RESTORE C(X), C(X+1)
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ELOOPFIN RELINT
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TC CHECKNJ # CHECK FOR NEW JOB
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CA SKEEP4 # REPLACES B(EBANK)
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TS EBANK
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INCR SKEEP7
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CS SKEEP7
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AD SKEEP3
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EXTEND
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BZF +2
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TC ERASLOOP # GO TO NEXT ADDRESS IN SAME BANK
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CCS SKEEP2
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TC NOEBANK
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INCR SKEEP2 # PUT +1 IN SKEEP2.
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CA EBANK
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AD SBIT9
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TS EBANK
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AD ERASCON5 # 76777, CHECK FOR BANK E2
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EXTEND
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BZF 2EBANK
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CCS EBANK
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TC E134567B # GO TO EBANKS 1,3,4,5,6, AND 7
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CA ERASCON6 # END OF ERASCHK
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TS EBANK
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# CNTRCHK PERFORMS A CS OF ALL REGISTERS FROM OCT. 60 THROUGH OCT. 10.
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# INCLUDED ARE ALL COUNTERS, T6-1, CYCLE AND SHIFT, AND ALL RUPT REGISTERS
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CNTRCHK CA CNTRCON # 00050
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CNTRLOOP TS SKEEP2
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AD SBIT4 # +10 OCTAL
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INDEX A
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# Page 1400
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CS 0000
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CCS SKEEP2
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TC CNTRLOOP
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# CYCLSHFT CHECKS THE CYCLE AND SHIFT REGISTERS
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CYCLSHFT CA CONC+S1 # 25252
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TS CYR # C(CYR) = 12525
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TS CYL # C(CYL) = 52524
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TS SR # C(SR) = 12525
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TS EDOP # C(EDOP) = 00125
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AD CYR # 37777 C(CYR) = 45252
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AD CYL # 00-12524 C(CYL) = 25251
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AD SR # 00-25251 C(SR) = 05252
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AD EDOP # 00-25376 C(EDOP) = +0
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AD CONC+S2 # C(CONC+S2) = 52400
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TC -1CHK
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AD CYR # 45252
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AD CYL # 72523
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AD SR # 77775
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AD EDOP # 77775
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AD S+1 # 77776
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TC -1CHK
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INCR SCOUNT +1
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TC SMODECHK
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# SKEEP1 HOLDS SUM
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# SKEEP2 HOLDS PRESENT CONTENTS OF ADDRESS IN ROPECHK AND SHOWSUM ROUTINES
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# SKEEP2 HOLDS BANK NUMBER IN LOW ORDER BITS DURING SHOWSUM DISPLAY
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# SKEEP3 HOLDS PRESENT ADDRESS (00000 TO 01777 IN COMMON FIXED BANKS)
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# (04000 TO 07777 IN FXFX BANKS)
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# SKEEP3 HOLDS BUGGER WORD DURING SHOWSUM DISPLAY
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# SKEEP4 HOLDS BANK NUMBER AND SUPER BANK NUMBER
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# SKEEP5 COUNTS 2 SUCCESSIVE TC SELF WORDS
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# SKEEP6 CONTROLS ROPECHK OR SHOWSUM OPTION
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# SKEEP7 CONTROLS WHEN ROUTINE IS IN COMMON FIXED OR FIXED FIXED BANKS
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ROPECHK CA S-ZERO # *
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TS SKEEP6 # * -0 FOR ROPECHK
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STSHOSUM CA S+ZERO # * SHOULD BE ROPECHK
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TS SKEEP4 # BANK NUMBER
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CA S+1
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COMMFX TS SKEEP7
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CA S+ZERO
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TS SKEEP1
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TS SKEEP3
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CA S+1
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TS SKEEP5 # COUNTS DOWN 2 TC SELF WORDS
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COMADRS CA SKEEP4
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TS L # TO SET SUPER BANK
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# Page 1401
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MASK HI5
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AD SKEEP3
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TC SUPDACAL # SUPER DATA CALL
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TC ADSUM
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AD SBIT11 # 02000
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TC ADRSCHK
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FXFX CS A
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TS SKEEP7
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EXTEND
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BZF +3
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CA SBIT12 # 04000, STARTING ADDRESS OF BANK 02
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TC +2
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CA SBNK03 # 06000, STARTING ADDRESS OF BANK 03
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TS SKEEP3
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CA S+ZERO
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TS SKEEP1
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CA S+1
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TS SKEEP5 # COUNTS DOWN 2 TC SELF WORDS
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FXADRS INDEX SKEEP3
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CA 0000
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TC ADSUM
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TC ADRSCHK
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ADSUM TS SKEEP2
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AD SKEEP1
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TS SKEEP1
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CAF S+ZERO
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AD SKEEP1
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TS SKEEP1
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CS SKEEP2
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AD SKEEP3
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TC Q
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ADRSCHK LXCH A
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CA SKEEP3
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MASK LOW10 # RELATIVE ADDRESS
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AD -MAXADRS # SUBTRACT MAX RELATIVE ADDRESS = 1777.
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EXTEND
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BZF SOPTION # CHECKSUM FINISHED IF LAST ADDRESS.
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CCS SKEEP5 # IS CHECKSUM FINISHED
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TC +3 # NO
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TC +2 # NO
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TC SOPTION # GO TO ROPECHK SHOWSUM OPTION
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CCS L # -0 MEANS A TC SELF WORD.
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TC CONTINU
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TC CONTINU
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TC CONTINU
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CCS SKEEP5
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TC CONTINU +1
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# Page 1402
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CA S-1
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TC CONTINU +1 # AD IN THE BUGGER WORD
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CONTINU CA S+1 # MAKE SURE TWO CONSECUTIVE TC SELF WORDS
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TS SKEEP5
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CCS SKEEP6 # *
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CCS NEWJOB # * +1, SHOWSUM
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TC CHANG1 # *
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TC +2 # *
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TC CHECKNJ # -0 IN SKEEP6 FOR ROPECHK
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ADRS+1 INCR SKEEP3
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CCS SKEEP7
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TC COMADRS
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TC COMADRS
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TC FXADRS
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TC FXADRS
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NXTBNK CS SKEEP4
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AD LSTBNKCH # LAST BANK TO BE CHECKED
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EXTEND
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BZF ENDSUMS # END OF SUMMING OF BANKS.
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CA SKEEP4
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AD SBIT11
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TS SKEEP4 # 37 TO 40 INCRMTS SKEEP4 BY END RND CARRY
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|
TC CHKSUPR
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|
17TO20 CA SBIT15
|
|
ADS SKEEP4 # SET FOR BANK 20
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|
TC GONXTBNK
|
|
CHKSUPR MASK HI5
|
|
EXTEND
|
|
BZF NXTSUPR # INCREMENT SUPER BANK
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|
27TO30 AD S13BITS
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|
EXTEND
|
|
BZF +2 # BANK SET FOR 30
|
|
TC GONXTBNK
|
|
CA SIXTY # FIRST SUPER BANK
|
|
ADS SKEEP4
|
|
TC GONXTBNK
|
|
NXTSUPR AD SUPRCON # SET BNK 30 + INCR SUPR BNK AND CANCEL
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|
ADS SKEEP4 # ERC BIT OF THE 37 TO 40 ADVANCE.
|
|
GONXTBNK CCS SKEEP7
|
|
TC COMMFX
|
|
CA S+1
|
|
TC FXFX
|
|
CA SBIT7 # HAS TO BE LARGER THAN NO OF FXSW BANKS.
|
|
TC COMMFX
|
|
|
|
SOPTION CA SKEEP4
|
|
MASK HI5 # = BANK BITS
|
|
TC LEFT5
|
|
# Page 1403
|
|
TS L # BANK NUMBER BEFORE SUPER BANK
|
|
CA SKEEP4
|
|
MASK S8BITS # = SUPER BANK BITS
|
|
EXTEND
|
|
BZF SOPT # BEFORE SUPER BANK
|
|
TS SR # SUPER BANK NECESSARY
|
|
CA L
|
|
MASK SEVEN
|
|
AD SR
|
|
TS L # BANK NUMBER WITH SUPER BANK
|
|
SOPT CA SKEEP6 # *
|
|
EXTEND # *
|
|
BZF +2 # * ON -0 CONTINUE WITH ROPE CHECK.
|
|
TC SDISPLAY # * ON +1 GO TO DISPLAY OF SUM.
|
|
CCS SKEEP1 # FORCE SUM TO ABSOLUTE VALUE.
|
|
TC +2
|
|
TC +2
|
|
AD S+1
|
|
TS SKEEP1
|
|
BNKCHK CS L # = - BANK NUMBER
|
|
AD SKEEP1
|
|
AD S-1
|
|
TC -1CHK # CHECK SUM
|
|
TC NXTBNK
|
|
|
|
EBANK= NEWJOB
|
|
LSTBNKCH BBCON* # * CONSTANT, LAST BANK.
|
|
SBANK= LOWSUPER
|
|
|
|
|