Source Code
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These source-code files are part of a reconstructed copy of LM131 revision 1,
the final release of the Apollo 13 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The source reconstruction began with source code of Luminary 131 previously
transcribed from a digitized copy of that program. A dump of the flight spare
core rope memory module B5, part number 2010802-171, serial number RAY 411,
was obtained. This module is the only module different between Luminary 131
and LM131 revision 1. The dump was disassembled and all changes were incorporated
into these source files. Note that page numbers in the reconstructed code match
those on the Luminary 131 printout, although the changed code would likely have
changed page numbers for a real LM131 revision 1 listing.
Comments from the original source code are prefixed with a single '#' symbol,
whereas comments added later are prefixed by "##" or "###". Report any errors
noted by creating an
issue report at the Virtual AGC
project's GitHub repository.
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015333,000002: ## Copyright: Public domain.
015334,000003: ## Filename: SYSTEM_TEST_STANDARD_LEAD_INS.agc
015335,000004: ## Purpose: A section of LM131 revision 1.
015336,000005: ## It is part of the reconstructed source code for the final
015337,000006: ## release of the flight software for the Lunar Module's (LM)
015338,000007: ## Apollo Guidance Computer (AGC) for Apollo 13. The code has
015339,000008: ## been reconstructed from a listing of Luminary 131 and a dump
015340,000009: ## of a core rope memory module B5, part number 2010802-171,
015341,000010: ## which is the only module different between LM131 revision 1
015342,000011: ## and Luminary 131. The executable generated from this source
015343,000012: ## has been verified against the module dump, so while the names,
015344,000013: ## comments, and ordering may not be exactly correct, the
015345,000014: ## resulting binary is.
015346,000015: ## Reference: pp. 372-374
015347,000016: ## Assembler: yaYUL
015348,000017: ## Contact: Ron Burkey <info@sandroid.org>.
015349,000018: ## Website: www.ibiblio.org/apollo/index.html
015350,000019: ## Mod history: 2022-10-28 MAS Created from Luminary 131.
015351,000020:
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Page 372
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015353,000022: 22,3242 E5,1642 EBANK= XSM
015354,000023:
015355,000024: 33,2045 BANK 33
015356,000025: 04,2000 SETLOC E/PROG
015357,000026: 04,2000 BANK
015358,000027:
015359,000028: 04,2562 COUNT* $$/P07
015360,000029:
015361,000030: # SPECIAL PROGRAMS TO EASE THE PANGS OF ERASABLE MEMORY PROGRAMS.
015362,000031:
015363,000032: # E/BKCALL FOR DOING BANKCALLS FROM AND RETURNING TO ERASABLE.
015364,000033:
015365,000034: # THIS ROUTINE IS CALLABLE FROM ERASABLE OR FIXED. LIKE BANKCALL, HOWEVER, SWITCHING BETWEEN S3 AND S4
015366,000035: # IS NOT POSSIBLE.
015367,000036:
015368,000037: # THE CALLING SEQUENCE IS:
015369,000038:
015370,000039: # TC BANKCALL
015371,000040: # CADR E/BKCALL
015372,000041: # CADR ROUTINE WHERE YOU WANT TO GO IN FIXED.
015373,000042: # RETURN HERE FROM DISPLAY TERMINATE, BAD STALL OR TC Q.
015374,000043: # RETURN HERE FROM DISPLAY PROCEED OR GOOD RETURN FROM STALL.
015375,000044: # RETURN HERE FROM DISPLAY ENTER OR RECYCLE.
015376,000045:
015377,000046: # THIS ROUTINE REQUIRES TWO ERASABLES (EBUF2, +1) IN UNSWITCHED WHICH ARE UNSHARED BY INTERRUPTS AND
015378,000047: # OTHER EMEMORY PROGRAMS.
015379,000048:
015380,000049: # A + L ARE PRESERVED THROUGH BANKCALL AND E/BKCALL.
015381,000050:
015382,000051: 04,2562 52134 E/BKCALL DXCH BUF2 # SAVE A,L AND GET DP RETURN.
015383,000052: 04,2563 53167 DXCH EBUF2 # SAVE DP RETURN.
015384,000053: 04,2564 25166 INCR EBUF2 # RETURN +1 BECAUSE DOUBLE CADR.
015385,000054: 04,2565 30006 CA BBANK
015386,000055: 04,2566 75012 MASK LOW10 # GET CURRENT EBANK. (SBANK SOMEDAY)
015387,000056: 04,2567 27167 ADS EBUF2 +1 # FORM BBCON. (WAS FBANK)
015388,000057: 04,2570 51166 NDX EBUF2
015389,000058: 04,2571 27777 CA 0 -1 # GET CADR OF ROUTINE.
015390,000059: 04,2572 04622 TC SWCALL # GO TO ROUTINE, SETTING Q TO SWRETURN
015391,000060: # AND RESTORING A + L.
015392,000061: 04,2573 02577 TC +4 # TX Q, V34, OR BAD STALL RETURN.
015393,000062: 04,2574 02576 TC +2 # PROCEED OR GOOD STALL RETURN.
015394,000063: 04,2575 25166 INCR EBUF2 # ENTER OR RECYCLE RETURN.
015395,000064: 04,2576 25166 INCR EBUF2
015396,000065: 04,2577 53167 E/SWITCH DXCH EBUF2
015397,000066: 04,2600 52006 DTCB
015398,000067:
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Page 373
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015400,000069: # E/CALL FOR CALLING A FIXED MEMORY INTERPRETIVE SUBROUTINE FROM ERASABLE AND RETURNING TO ERASABLE.
015401,000070:
015402,000071: # THE CALLING SEQUENCE IS...
015403,000072:
015404,000073: # RTB
015405,000074: # E/CALL
015406,000075: # CADR ROUTINE THE INTERPRETIVE SUBROUTINE YOU WANT.
015407,000076: # RETURNS HERE IN INTERPRETIVE.
015408,000077:
015409,000078: 04,2601 22164 E/CALL LXCH LOC # ADRES -1 OF CADR.
015410,000079: 04,2602 50001 INDEX L
015411,000080: 04,2603 30001 CA L # CADR IN A.
015412,000081: 04,2604 24001 INCR L
015413,000082: 04,2605 24001 INCR L # RETURN ADRES IN L.
015414,000083: 04,2606 53167 DXCH EBUF2 # STORE CADR AND RETURN.
015415,000084: 04,2607 06042 TC INTPRET
015416,000085: 04,2610 77624 CALL
015417,000086: 04,2611 01166 EBUF2 # INDIRECTLY EXECUTE ROUTINE. IT MUST
015418,000087: 04,2612 77776 EXIT # LEAVE VIA RVQ OR EQUIVALENT.
015419,000088: 04,2613 23167 LXCH EBUF2 +1 # PICK UP RETURN.
015420,000089: 04,2614 16044 TCF INTPRET +2 # SET LOC AND RETURN TO CALLER.
015421,000090:
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Page 374
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015423,000092: # E/JOBWAK FOR WAKING UP ERASABLE MEMORY JOBS.
015424,000093:
015425,000094: # THIS ROUTINE MUST BE CALLED IN INTERRUPT OR WITH INTERRUPTS INHIBITED.
015426,000095:
015427,000096: # THE CALLING SEQUENCE IS:
015428,000097:
015429,000098: # INHINT
015430,000099: # .
015431,000100: # .
015432,000101: # CA WAKEADR ADDRESS OF SLEEPING JOB
015433,000102: # TC IBNKCALL
015434,000103: # CADR E/JOBWAK
015435,000104: # . RETURNS HERE
015436,000105: # .
015437,000106: # .
015438,000107: # RELINT IF YOU DID AN INHINT.
015439,000108:
015440,000109: 33,2045 BANK 33
015441,000110: 04,2000 SETLOC E/PROG
015442,000111: 04,2000 BANK
015443,000112:
015444,000113: 04,2615 COUNT* $$/P07
015445,000114:
015446,000115: 04,2615 05137 E/JOBWAK TC JOBWAKE # ARRIVE IWTH ADRES IN A.
015447,000116: 04,2616 44741 CS BIT11
015448,000117: 04,2617 50064 NDX LOCCTR
015449,000118: 04,2620 26164 ADS LOC # KNOCK FIXED MEMORY BIT OUT OF ADRES.
015450,000119: 04,2621 00072 TC RUPTREG3 # RETURN
015451,000120:
End of include-file SYSTEM_TEST_STANDARD_LEAD_INS.agc. Parent file is MAIN.agc