Assembly listing generated by yaYUL

Source Code

These source code files are a reconstruction of Sundance, the Apollo 9 LM (Lunar Module) AGC (Apollo Guidance Computer) flight software, created from binary dumps of original core rope program modules, as follows:

B1 — Revision 292
B2 — Revision 302
B3 — Revision 302
B4 — Revision 302
B5 — Revision 292
B6 — Revision 306

This means that source code does not represent a specific historical revision of Sundance, but rather a mixture of the three released versions. Nonetheless, it is capable of flying the whole Apollo 9 mission. This source code matches the binary dumps, as closely as feasible, but 100% match is not possible, due mostly to changes in memory addresses at which code and variables were allocated in different revisions of Sundance. Refer to this list of explanations for each binary mismatch.

Since only binary dumps (rather than listings) of Sundance are available as source material, all comments and labels are approximate. They have been taken from other AGC programs where possible, or, in some places, written from scratch to match what we believe would have been in the original listing.

050991,000002: 050992,000003: 050993,000004: 050994,000005: 050995,000006: 050996,000007: 050997,000008: 050998,000009: 050999,000010: 051000,000011: 051001,000012: 051002,000013: 051003,000014: 051004,000015: 051005,000016: 051006,000017: 01,3314 051007,000018: 01,2000 051008,000019: 01,2000 051009,000020: 051010,000021: 01,3314 E3,1436 051011,000022: 051012,000023: 01,3314 < ## Copyright: Public domain. ## Filename: RESTARTS_ROUTINE.agc ## Purpose: A section of a reconstructed, mixed version of Sundance ## It is part of the reconstructed source code for the Lunar ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 9. ## No original listings of this program are available; ## instead, this file was created via disassembly of dumps ## of various revisions of Sundance core rope modules. ## Assembler: yaYUL ## Contact: Ron Burkey <info@sandroid.org>. ## Website: www.ibiblio.org/apollo/index.html ## Mod history: 2020-06-17 MAS Created from Luminary 69. ## Sundance 292 BANK 01 SETLOC RESTART BANK EBANK= PHSNAME1 # GOPROG MUST SWITCH TO THIS EBANK COUNT* $$/RSROU 453">051013,000024: 01,3314 30161 RESTARTS CA MPAC +5 # GET GROUP NUMBER -1 60000 DOUBLE # SAVE FOR INDEXING 54155 TS TEMP2G 33556 CA PHS2CADR # SET UP EXIT IN CASE IT IS AN EVEN 54157 TS TEMPSWCH # TABLE PHASE 33353 CA RTRNCADR # TO SAVE TIME ASSUME IT WILL GET NEXT 54707 TS GOLOC +2 # GROUP AFTER THIS 30154 CA TEMPPHS 75057 MASK OCT1400 10000 CCS A # IS IT A VARIABLE OR TABLE RESTART 13337 TCF ITSAVAR # IT:S A VARIABLE RESTART 432">051028,000039: 01,3327 10154 GETPART2 CCS TEMPPHS # IS IT AN X.1 RESTART 10000 CCS A 13437 TCF ITSATBL # NO, ITS A TABLE RESTART 35074 CA PRIO14 # IT IS AN X.1 RESTART, THEREFORE START 05155 TC FINDVAC # THE DISPLAY RESTART JOB EBANK= LST1 02735 20103 2CADR INITDSP 03353 TC RTRNCADR # FINISHED WITH THIS GROUP, GET NEXT ONE 2">051039,000050: 01,3337 75057 ITSAVAR MASK OCT1400 # IS IT TYPE B ? 10000 CCS A 13410 TCF ITSLIKEB # YES, IT IS TYPE B 00006 EXTEND # STORE THE JOB (OR TASK) 2CADR FOR EXIT 50155 NDX TEMP2G 31437 DCA PHSNAME1 52706 DXCH GOLOC 30154 CA TEMPPHS # SEE IF THIS IS A JOB, TASK, OR A LONGCAL 75032 MASK OCT7 67720 AD MINUS2 10000 CCS A 13522 TCF ITSLNGCL # ITS A LONGCALL 452">051054,000065: 01,3353 04670 RTRNCADR TC SWRETURN # CANT GET HERE 13356 TCF ITSAWAIT 13423 TCF ITSAJOB # ITS A JOB 954">051059,000070: 01,3356 33562 ITSAWAIT CA WTLTCADR # SET UP WAITLIST CALL 54704 TS GOLOC -1 50155 NDX TEMP2G # DIRECTLY STORED 31055 CA PHSPRDT1 354">051064,000075: 01,3362 10000 TIMETEST CCS A # IS IT AN IMMEDIATE RESTART 24000 INCR A # NO, 13367 TCF FINDTIME # FIND OUT WHEN IT SHOULD BEGIN 15525 TCF ITSINDIR # STORED INDIRECTLY 13406 TCF IMEDIATE # IT WANTS AN IMMEDIATE RESTART # ***** THIS MUST BE IN FIXED FIXED ***** BLOCK 02 SETLOC FFTAG2 BANK COUNT* $$/RSROU 952">051079,000090: 5525 22706 ITSINDIR LXCH GOLOC +1 # GET THE CORRECT E BANK IN CASE THIS IS 22006 LXCH BB # SWITCHED ERRASIBLE 50000 NDX A # GET THE TIME INDIRECTLY 30001 CA 1 22006 LXCH BB # RESTORE THE BB AND GOLOC 22706 LXCH GOLOC +1 13367 TCF FINDTIME # FIND OUT WHEN IT SHOULD BEGIN # ***** YOU MAY RETURN TO SWITCHED FIXED ***** BANK 01 SETLOC RESTART BANK COUNT* $$/RSROU D45">051097,000108: 01,3367 40000 FINDTIME COM # MAKE NEGITIVE SINCE IT WILL BE SUBTRACTD 54001 TS L # AND SAVE 50155 NDX TEMP2G 41054 CS TBASE1 00006 EXTEND 60025 SU TIME1 10000 CCS A 40000 COM 67703 AD OCT37776 65026 AD ONE 60001 AD L 10000 CCS A 35030 CA ZERO 13406 TCF +2 13406 TCF +1 445">051112,000123: 01,3406 65026 IMEDIATE AD ONE 00704 TC GOLOC -1 542">051114,000125: 01,3410 33353 ITSLIKEB CA RTRNCADR # TYPE B, SO STORE RETURN IN 54157 TS TEMPSWCH # TEMPSWCH IN CASE OF AN EVEN PHASE 33557 CA PRT2CADR # SET UP EXIT TO GET TABLE PART OF THIS 54707 TS GOLOC +2 # VARIABLE TYPE OF PHASE 30154 CA TEMPPHS # MAKE THE PHASE LOOK RIGHT FOR THE TABLE 76050 MASK OCT177 # PART OF THIS VARIABLE PHASE 54154 TS TEMPPHS 00006 EXTEND 50155 NDX TEMP2G # OBTAIN THE JOB:S 2CADR 31437 DCA PHSNAME1 52706 DXCH GOLOC 2">051129,000140: 01,3423 50155 ITSAJOB NDX TEMP2G # NOW ADD THE PRIORITY AND LET:S GO 31055 CA PHSPRDT1 143">051131,000142: 01,3425 54704 CHKNOVAC TS GOLOC -1 # SAVE PRIO UNTIL WE SEE IF ITS 00006 EXTEND # A FINDVAC OR A NOVAC 63433 BZMF ITSNOVAC 33561 CAF FVACCADR # POSITIVE, SET UP FINDVAC CALL. 56704 XCH GOLOC -1 # PICK UP PRIO, 00704 TC GOLOC -1 # AND GO 143">051139,000150: 01,3433 33563 ITSNOVAC CAF NOVACADR # NEGATIVE, 56704 XCH GOLOC -1 # SET UP NOVAC CALL, 40000 COM # CORRECT PRIO, 00704 TC GOLOC -1 # AND GO C">051144,000155: 01,3437 54020 ITSATBL TS CYR # FIND OUT IF THE PHASE IS ODD OR EVEN 10020 CCS CYR 13442 TCF +1 # IT:S EVEN 13540 TCF ITSEVEN 33353 CA RTRNCADR # IN CASE THIS IS THE SECOND PART OF A 54707 TS GOLOC +2 # TYPE B RESTART, WE NEED PROPER EXIT 30154 CA TEMPPHS # SET UP POINTER FOR FINDING OUR PLACE IN 54021 TS SR # THE RESTART TABLES 60021 AD SR 50155 NDX TEMP2G 62001 AD SIZETAB +1 54156 TS POINTER 2">051159,000170: 01,3453 00006 CONTBL2 EXTEND # FIND OUT WHAT:S IN THE TABLE 50156 NDX POINTER 32002 DCA CADRTAB # GET THE 2CADR 22706 LXCH GOLOC +1 # STORE THE BB INFORMATION 10000 CCS A # IS IT A JOB OR IS IT TIMED 24000 INCR A # POSITIVE, MUST BE A JOB 13534 TCF ITSAJOB2 24000 INCR A # MUST BE EITHER A WAITLIST OR LONGCALL 54705 TS GOLOC # LET-S STORE THE CORRECT CADR 33562 CA WTLTCADR # SET UP OUR EXIT TO WAITLIST 54704 TS GOLOC -1 30706 CA GOLOC +1 # NOW FIND OUT IF IT IS A WAITLIST CALL 75015 MASK BIT10 # THIS SHOULD BE ONE IF WE HAVE -BB 10000 CCS A # FOR THAT MATTER SO SHOULD BE BITS 9,8,7, # 6,5, AND LAST BUT NOT LEAST (PERHAPS NOT # IN IMPORTANCE ANYWAY. BIT 4 13527 TCF ITSWTLST # IT IS A WAITLIST CALL 50156 NDX POINTER # OBTAIN THE ORIGINAL DELTA T 32000 CA PRDTTAB # ADDRESS FOR THIS LONGCALL 15534 TCF ITSLGCL1 # NOW GO GET THE DELTA TIME # ***** THIS MUST BE IN FIXED FIXED ***** BLOCK 02 SETLOC FFTAG2 BANK COUNT* $$/RSROU C31">051194,000205: 5534 22706 ITSLGCL1 LXCH GOLOC +1 # OBTAIN THE CORRECT E BANK 22006 LXCH BB 22706 LXCH GOLOC +1 # AND PRESERVE OUR E AND F BANKS 00006 EXTEND # GET THE DELTA TIME 50000 NDX A 30001 DCA 0 22706 LXCH GOLOC +1 # RESTORE OUR E AND F BANK 22006 LXCH BB # RESTORE THE TASKS E AND F BANKS 22706 LXCH GOLOC +1 # AND PRESERVE OUR L 13475 TCF ITSLGCL2 # NOW LET:S PROCESS THIS LONGCALL # ***** YOU MAY RETURN TO SWITCHED FIXED ***** BANK 01 SETLOC RESTART BANK COUNT* $$/RSROU C32">051214,000225: 01,3475 53165 ITSLGCL2 DXCH LONGTIME 00006 EXTEND # CALCULATE TIME LEFT 40025 DCS TIME2 21165 DAS LONGTIME 00006 EXTEND 31163 DCA LONGBASE 21165 DAS LONGTIME 11164 CCS LONGTIME # FIND OUT HOW THIS SHOULD BE RESTARTED 13515 TCF LONGCLCL 13510 TCF +2 13403 TCF IMEDIATE -3 11165 CCS LONGTIME +1 13515 TCF LONGCLCL 13513 NOOP # CAN:T GET HERE ********* 13403 TCF IMEDIATE -3 13406 TCF IMEDIATE 34C">051233,000244: 01,3515 33560 LONGCLCL CA LGCLCADR # WE WILL GO TO LONGCALL 54704 TS GOLOC -1 00006 EXTEND # PREPARE OUR ENTRY TO LONGCALL 31165 DCA LONGTIME 00704 TC GOLOC -1 34C">051240,000251: 01,3522 33562 ITSLNGCL CA WTLTCADR # ASSUME IT WILL GO TO WAITLIST 54704 TS GOLOC -1 50155 NDX TEMP2G 41055 CS PHSPRDT1 # GET THE DELTA T ADDRESS 15534 TCF ITSLGCL1 # NOW GET THE DELTA TIME 354">051248,000259: 01,3527 40706 ITSWTLST CS GOLOC +1 # CORRECT THE BBCON INFORMATION 54706 TS GOLOC +1 50156 NDX POINTER # GET THE DT AND FIND OUT IF IT WAS STORED 32000 CA PRDTTAB # DIRECTLY OR INDIRECTLY 13362 TCF TIMETEST # FIND OUT HOW THE TIME IS STORED 232">051256,000267: 01,3534 56705 ITSAJOB2 XCH GOLOC # STORE THE CADR 50156 NDX POINTER # ADD THE PRIORITY AND LET:S GO 32000 CA PRDTTAB 13425 TCF CHKNOVAC E">051263,000274: 01,3540 30157 ITSEVEN CA TEMPSWCH # SET UP FOR EITHER THE SECOND PART OF THE 54707 TS GOLOC +2 # TABLE, OR A RETURN FOR THE NEXT GROUP 50155 NDX TEMP2G # SET UP POINTER FOR OUR LOCATION WITHIN 32000 CA SIZETAB # THE TABLE 60154 AD TEMPPHS # THIS MAY LOOK BAD BUT LET:S SEE YOU DO 60154 AD TEMPPHS # BETTER IN TIME OR NUMBERR OF LOCATIONS 60154 AD TEMPPHS 54156 TS POINTER 13453 TCF CONTBL2 # NOW PROCESS WHAT IS IN THE TABLE 432">051275,000286: 01,3551 36221 PHSPART2 CA THREE # SET THE POINTER FOR THE SECOND HALF OF 26156 ADS POINTER # THE TABLE 33353 CA RTRNCADR # THIS WILL BE OUR LAST TIME THROUGH THE 54707 TS GOLOC +2 # EVEN TABLE, SO AFTER IT GET THE NEXT # GROUP 13453 TCF CONTBL2 # SO LET:S GET THE SECOND ENTRY IN THE TBL 3">051283,000294: 01,3556 0154 TEMPPHS EQUALS MPAC >051284,000295: 01,3556 0155 TEMP2G EQUALS MPAC +1 2">051285,000296: 01,3556 0156 POINTER EQUALS MPAC +2 348">051286,000297: 01,3556 0157 TEMPSWCH EQUALS MPAC +3 /a>051287,000298: 01,3556 0705 GOLOC EQUALS VAC5 +20D >051288,000299: 01,3556 7720 MINUS2 EQUALS NEG2 >051289,000300: 01,3556 6050 OCT177 EQUALS LOW7 452">051291,000302: 01,3556 03551 PHS2CADR GENADR PHSPART2 452">051292,000303: 01,3557 03327 PRT2CADR GENADR GETPART2 452">051293,000304: 01,3560 05337 LGCLCADR GENADR LONGCALL 452">051294,000305: 01,3561 05155 FVACCADR GENADR FINDVAC 452">051295,000306: 01,3562 05252 WTLTCADR GENADR WAITLIST 452">051296,000307: 01,3563 05142 NOVACADR GENADR NOVAC RESTARTS_ROUTINE.agc. Parent file is MAIN.agc