Source Code
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This is a reconstruction of the AGC program Luminary 99 Rev 0. It was the
second release of the Lunar Module flight software targeted for use in Apollo 11, after Luminary 97.
A bug (which had been around since at least Apollo 10, Luminary 69) was
discovered in Rev 0 shortly before the Apollo 11 flight, resulting in a last minute
revision into Rev 1,
which is what actually flew rather than
the Rev 0 presented here. A hardcopy of Rev 0 is known to
exist — it belonged to AGC developer Allan Klumpp for many years — but
unfortunately the Virtual AGC Project has not had access to that hardcopy. Thus
the code you see here had been reconstructed (we believe accurately) rather than
transcribed. The first step of the reconstruction of the Rev 0 source code was
the transcription of the Rev 1 source code from a hardcopy in the MIT Museum collection.
The process of reverting the active portion of the source code (i.e., other than
program comments) from Rev 1 to Rev 0 was very minor, consisting
only of moving the position of the STARTSB1 label in
FRESH START AND RESTART. Allan had previously given
us the checksums of the memory banks of Rev 0, and we have verified the program presented here has checksums
identical to all banks of Allan's listing of Rev 0. The notations on Allan's Rev 0 program listing read,
in part:GAP: ASSEMBLE REVISION 099 OF AGC PROGRAM LUMINARY BY NASA 2021112-051 A single program comment is known to differ between Rev 0 and Rev 1, but these are harder to reconstruct and verify than changes to the active portion of the code. Thus it is possible that there are additional differences between the program comments in Rev 0 and Rev 1 that are unknown to us, and therefore are not reflected in the code presented here. |
058422,000002: ## Copyright: Public domain.
058423,000003: ## Filename: KEYRUPT,_UPRUPT.agc
058424,000004: ## Purpose: Part of the reconstructed source code for LMY99 Rev 0,
058425,000005: ## otherwise known as Luminary Rev 99, the second release
058426,000006: ## of the Apollo Guidance Computer (AGC) software for Apollo 11.
058427,000007: ## It differs from LMY99 Rev 1 (the flown version) only in the
058428,000008: ## placement of a single label. The corrections shown here have
058429,000009: ## been verified to have the same bank checksums as AGC developer
058430,000010: ## Allan Klumpp's copy of Luminary Rev 99, and so are believed
058431,000011: ## to be accurate. This file is intended to be a faithful
058432,000012: ## recreation, except that the code format has been changed to
058433,000013: ## conform to the requirements of the yaYUL assembler rather than
058434,000014: ## the original YUL assembler.
058435,000015: ##
058436,000016: ## Assembler: yaYUL
058437,000017: ## Contact: Ron Burkey <info@sandroid.org>.
058438,000018: ## Website: www.ibiblio.org/apollo.
058439,000019: ## Pages: 1338-1340
058440,000020: ## Mod history: 2009-05-27 RSB Adapted from the corresponding
058441,000021: ## Luminary131 file, using page
058442,000022: ## images from Luminary 1A.
058443,000023: ## 2016-12-18 RSB Proofed text comments with octopus/ProoferComments
058444,000024: ## and corrected the errors found.
058445,000025: ## 2017-08-01 MAS Created from LMY99 Rev 1.
058446,000026:
058447,000027: ## This source code has been transcribed or otherwise adapted from
058448,000028: ## digitized images of a hardcopy from the MIT Museum. The digitization
058449,000029: ## was performed by Paul Fjeld, and arranged for by Deborah Douglas of
058450,000030: ## the Museum. Many thanks to both. The images (with suitable reduction
058451,000031: ## in storage size and consequent reduction in image quality as well) are
058452,000032: ## available online at www.ibiblio.org/apollo. If for some reason you
058453,000033: ## find that the images are illegible, contact me at info@sandroid.org
058454,000034: ## about getting access to the (much) higher-quality images which Paul
058455,000035: ## actually created.
058456,000036: ##
058457,000037: ## The code has been modified to match LMY99 Revision 0, otherwise
058458,000038: ## known as Luminary Revision 99, the Apollo 11 software release preceeding
058459,000039: ## the listing from which it was transcribed. It has been verified to
058460,000040: ## contain the same bank checksums as AGC developer Allan Klumpp's listing
058461,000041: ## of Luminary Revision 99 (for which we do not have scans).
058462,000042: ##
058463,000043: ## Notations on Allan Klumpp's listing read, in part:
058464,000044: ##
058465,000045: ## ASSEMBLE REVISION 099 OF AGC PROGRAM LUMINARY BY NASA 2021112-51
058466,000046:
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Page 1338 |
058468,000048: 14,3774 BANK 14
058469,000049: 04,2000 SETLOC KEYRUPT
058470,000050: 04,2000 BANK
058471,000051: 04,3274 COUNT* $$/KEYUP
058472,000052:
058473,000053: 04,3274 54016 KEYRUPT1 TS BANKRUPT
058474,000054: 04,3275 56002 XCH Q
058475,000055: 04,3276 54012 TS QRUPT
058476,000056: 04,3277 04400 TC LODSAMPT # TIME IS SNATCHED IN RUPT FOR NOUN 65.
058477,000057: 04,3300 34346 CAF LOW5
058478,000058: 04,3301 00006 EXTEND
058479,000059: 04,3302 02015 RAND MNKEYIN # CHECK IF KEYS 5M-1M ON
058480,000060: 04,3303 54073 KEYCOM TS RUPTREG4
058481,000061: 04,3304 40101 CS FLAGWRD5
058482,000062: 04,3305 74735 MASK DSKYFBIT
058483,000063: 04,3306 26101 ADS FLAGWRD5
058484,000064:
058485,000065: 04,3307 34355 ACCEPTUP CAF CHRPRIO # (NOTE: RUPTREG4 = KEYTEMP1)
058486,000066: 04,3310 05072 TC NOVAC
058487,000067: 04,3311 0777 EBANK= DSPCOUNT
058488,000068: 04,3311 02077 60101 2CADR CHARIN
058489,000069:
058490,000070: 04,3313 30073 CA RUPTREG4
058491,000071: 04,3314 50064 INDEX LOCCTR
058492,000072: 04,3315 54154 TS MPAC # LEAVE 5 BIT KEY CDE IN MPAC FOR CHARIN
058493,000073: 04,3316 05270 TC RESUME
058494,000074:
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Page 1339 |
058496,000076: # UPRUPT PROGRAM
058497,000077:
058498,000078: 04,3317 54016 UPRUPT TS BANKRUPT
058499,000079: 04,3320 56002 XCH Q
058500,000080: 04,3321 54012 TS QRUPT
058501,000081: 04,3322 04400 TC LODSAMPT # TIME IS SNATCHED IN RUPT FOR NOUN 65.
058502,000082: 04,3323 34755 CAF ZERO
058503,000083: 04,3324 56045 XCH INLINK
058504,000084: 04,3325 54073 TS KEYTEMP1
058505,000085: 04,3326 34751 CAF BIT3 # TURN ON UPACT LIGHT
058506,000086: 04,3327 00006 EXTEND # (BIT 3 OF CHANNEL 11)
058507,000087: 04,3330 05011 WOR DSALMOUT
058508,000088: 04,3331 34346 UPRPT1 CAF LOW5 # TEST FOR TRIPLE CHAR REDUNDANCY
058509,000089: 04,3332 70073 MASK KEYTEMP1 # LOW5 OF WORD
058510,000090: 04,3333 56073 XCH KEYTEMP1 # LOW5 INTO KEYTEMP1
058511,000091: 04,3334 00006 EXTEND
058512,000092: 04,3335 74742 MP BIT10 # SHIFT RIGHT 5
058513,000093: 04,3336 54734 TS KEYTEMP2
058514,000094: 04,3337 74346 MASK LOW5 # MID 5
058515,000095: 04,3340 63374 AD HI10
058516,000096: 04,3341 03371 TC UPTEST
058517,000097: 04,3342 34742 CAF BIT10
058518,000098: 04,3343 00006 EXTEND
058519,000099: 04,3344 70734 MP KEYTEMP2 # SHIFT RIGHT 5
058520,000100: 04,3345 74346 MASK LOW5 # HIGH 5
058521,000101: 04,3346 40000 COM
058522,000102: 04,3347 03371 TC UPTEST
058523,000103:
058524,000104: 04,3350 43377 UPCK CS ELRCODE # CODE IS GOOD. IF CODE = 'ERROR RESET',
058525,000105: 04,3351 60073 AD KEYTEMP1 # CLEAR UPLOCKFL (SET BIT4 OF FLAGWRD7 = 0)
058526,000106: 04,3352 00006 EXTEND # IF CODE DOES NOT = 'ERROR RESET', ACCEPT
058527,000107: 04,3353 13361 BZF CLUPLOCK # CODE ONLY IF UPLOCKFL IS CLEAR (=0).
058528,000108:
058529,000109: 04,3354 34750 CAF UPLOCBIT # TEST UPLOCKFL FOR 0 OR 1
058530,000110: 04,3355 70103 MASK FLAGWRD7
058531,000111: 04,3356 10000 CCS A
058532,000112: 04,3357 05270 TC RESUME # UPLOCKFL = 1
058533,000113: 04,3360 03307 TC ACCEPTUP # UPLOCKFL = 0
058534,000114:
058535,000115: 04,3361 44750 CLUPLOCK CS UPLOCBIT # CLEAR UPLOCKFL (I.E., SET BIT 4 OF )
058536,000116: 04,3362 70103 MASK FLAGWRD7 # FLAGWRD7 = 0)
058537,000117: 04,3363 54103 TS FLAGWRD7
058538,000118: 04,3364 03307 TC ACCEPTUP
058539,000119:
058540,000120: # CODE IS BAD
058541,000121: 04,3365 40103 TMFAIL2 CS FLAGWRD7 # LOCK OUT FURTHER UPLINK ACTIVITY
058542,000122: 04,3366 74750 MASK UPLOCBIT # (BY SETTING UPLOCKFL = 1) UNTIL
058543,000123: 04,3367 26103 ADS FLAGWRD7 # 'ERROR RESET' IS SENT VIA UPLINK.
058544,000124: 04,3370 05270 TC RESUME
058545,000125: 04,3371 60073 UPTEST AD KEYTEMP1
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Page 1340 |
058547,000127: 04,3372 10000 CCS A
058548,000128: 04,3373 03365 TC TMFAIL2
058549,000129: 04,3374 77740 HI10 OCT 77740
058550,000130: 04,3375 03365 TC TMFAIL2
058551,000131: 04,3376 00002 TC Q
058552,000132:
058553,000133: 04,3377 00022 ELRCODE OCT 22
058554,000134:
058555,000135: # 'UPLINK ACTIVITY LIGHT' IS TURNED OFF BY .....
058556,000136: # 1. VBRELDSP
058557,000137: # 2. ERROR RESET
058558,000138: # 3. UPDATE PROGRAM (P27) ENTERED BY V70,V71,V72, AND V73.
058559,000139: # -
058560,000140: # THE RECEPTION OF A BAD CODE (I.E CCC FAILURE) LOCKS OUT FURTHER UPLINK ACTIVITY BY SETTING BIT4 OF FLAGWRD7 = 1.
058561,000141: # THIS INDICATION WILL BE TRANSFERRED TO THE GROUND BY THE DOWNLINK WHICH DOWNLINKS ALL FLAGWORDS.
058562,000142: # WHEN UPLINK ACTIVITY IS LOCKED OUT, IT CAN BE ALLOWED WHEN THE GROUND UPLINKS AND 'ERROR RESET' CODE.
058563,000143: # (IT IS RECOMMENDED THAT THE 'ERROR LIGHT RESET' CODE IS PRECEEDED BY 16 BITS THE FIRST OF WHICH IS 1 FOLLOWED
058564,000144: # BY 15 ZEROES. THIS WILL ELIMINATE EXTRANEOUS BITS FROM INLINK WHICH MAY HAVE BEEN LEFT OVER FROM THE ORIGINAL
058565,000145: # FAILURE)
058566,000146:
058567,000147: # UPLINK ACTIVITY IS ALSO ALLOWED (UNLOCKED) DURING FRESH START WHEN FRESH START SETS BIT4 OF FLAGWRD7 = 0.
058568,000148:
058569,000149: 04,3400 44753 CS XDSPBIT
058570,000150:
End of include-file KEYRUPT,_UPRUPT.agc. Parent file is MAIN.agc