GAP: ASSEMBLE REVISION 001 OF AGC PROGRAM LMY99 BY NASA 2021112-061 16:27 JULY 14,1969Note that the date is the date of the printout, not the date of the program revision.
Source Code
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These source-code files were from the printout at the MIT Museum, with many thanks
to Deborah Douglas, the Museum's Curator of Science and Technology, for releasing
it to us. The printout was digitally photographed by Paul Fjeld. A team of
volunteers transcribed the source code manually from these images or, where
appropriate, modified already-transcribed but similar source Luminary 131 (Apollo 13)
source code to agree with the images from the printout. Note that the page images
presented online are of reduced quality, and that higher-quality images
are available. Report any conversion errors or legibility
problems in page images to info@sandroid.org.
Notations on the program listing read, in part:GAP: ASSEMBLE REVISION 001 OF AGC PROGRAM LMY99 BY NASA 2021112-061 16:27 JULY 14,1969Note that the date is the date of the printout, not the date of the program revision. |
043543,000002: ## Copyright: Public domain.
043544,000003: ## Filename: INTER-BANK_COMMUNICATION.agc
043545,000004: ## Purpose: Part of the source code for Luminary 1A build 099.
043546,000005: ## It is part of the source code for the Lunar Module's (LM)
043547,000006: ## Apollo Guidance Computer (AGC), for Apollo 11.
043548,000007: ## Assembler: yaYUL
043549,000008: ## Contact: Ron Burkey <info@sandroid.org>.
043550,000009: ## Website: www.ibiblio.org/apollo.
043551,000010: ## Pages: 998-1001
043552,000011: ## Mod history: 2009-05-24 RSB Adapted from the corresponding
043553,000012: ## Luminary131 file, using page
043554,000013: ## images from Luminary 1A.
043555,000014: ## 2011-05-08 JL Removed workaround.
043556,000015: ## 2016-12-17 RSB Proofed text comments with octopus/ProoferComments
043557,000016: ## and corrected the errors found.
043558,000017: ## 2017-03-13 RSB Comment-text fixes noted in proofing Luminary 116.
043559,000018: ## 2017-03-17 RSB Comment-text fixes identified in diff'ing
043560,000019: ## Luminary 99 vs Comanche 55.
043561,000020: ## 2021-05-30 ABS ISWCALLL -> ISWCALL
043562,000021:
043563,000022: ## This source code has been transcribed or otherwise adapted from
043564,000023: ## digitized images of a hardcopy from the MIT Museum. The digitization
043565,000024: ## was performed by Paul Fjeld, and arranged for by Deborah Douglas of
043566,000025: ## the Museum. Many thanks to both. The images (with suitable reduction
043567,000026: ## in storage size and consequent reduction in image quality as well) are
043568,000027: ## available online at www.ibiblio.org/apollo. If for some reason you
043569,000028: ## find that the images are illegible, contact me at info@sandroid.org
043570,000029: ## about getting access to the (much) higher-quality images which Paul
043571,000030: ## actually created.
043572,000031: ##
043573,000032: ## Notations on the hardcopy document read, in part:
043574,000033: ##
043575,000034: ## Assemble revision 001 of AGC program LMY99 by NASA 2021112-61
043576,000035: ## 16:27 JULY 14, 1969
043577,000036:
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Page 998 |
043579,000038: # THE FOLLOWING ROUTINE CAN BE USED TO CALL A SUBROUTINE IN ANOTHER BANK. IN THE BANKCALL VERSION, THE
043580,000039: # CADR OF THE SUBROUTINE IMMEDIATELY FOLLOWS THE TC BANKCALL INSTRUCTION, WITH C(A) AND C(L) PRESERVED.
043581,000040:
043582,000041: 4616 BLOCK 02
043583,000042: 4616 COUNT* $$/BANK
043584,000043: 4616 52134 BANKCALL DXCH BUF2 # SAVE INCOMING A,L.
043585,000044: 4617 50002 INDEX Q # PICK UP CADR.
043586,000045: 4620 30000 CA 0
043587,000046: 4621 24002 INCR Q # SO WE RETURN TO THE LOC. AFTER THE CADR.
043588,000047:
043589,000048: # SWCALL IS IDENTICAL TO BANKCALL, EXCEPT THAT THE CADR ARRIVES IN A.
043590,000049:
043591,000050: 4622 54001 SWCALL TS L
043592,000051: 4623 22004 LXCH FBANK # SWITCH BANKS, SAVING RETURN.
043593,000052: 4624 75012 MASK LOW10 # GET SUB-ADDRESS OF CADR.
043594,000053: 4625 56002 XCH Q # A,L NOW CONTAINS DP RETURN.
043595,000054: 4626 52134 DXCH BUF2 # RESTORING INPUTS IF THIS IS A BANKCALL.
043596,000055: 4627 50002 INDEX Q
043597,000056: 4630 02000 TC 10000 # SETTING Q TO SWRETURN.
043598,000057:
043599,000058: 4631 56134 SWRETURN XCH BUF2 +1 # COMES HERE TO RETURN TO CALLER. C(A,L)
043600,000059: 4632 56004 XCH FBANK # ARE PRESERVED FOR RETURN.
043601,000060: 4633 56134 XCH BUF2 +1
043602,000061: 4634 00133 TC BUF2
043603,000062:
043604,000063: # THE FOLLOWING ROUTINE CAN BE USED AS A UNILATERAL JUMP WITH C(A,L) PRESERVED AND THE CADR IMMEDIATELY
043605,000064: # FOLLOWING THE TC POSTJUMP INSTRUCTION.
043606,000065:
043607,000066: 4635 56002 POSTJUMP XCH Q # SAVE INCOMING C(A).
043608,000067: 4636 50000 INDEX A # GET CADR.
043609,000068: 4637 30000 CA 0
043610,000069:
043611,000070: # BANKJUMP IS THE SAME AS POSTJUMP, EXCEPT THAT THE CADR ARRIVES IN A.
043612,000071:
043613,000072: 4640 54004 BANKJUMP TS FBANK
043614,000073: 4641 75012 MASK LOW10
043615,000074: 4642 56002 XCH Q # RESTORING INPUT C(A) IF THIS WAS A
043616,000075: 4643 50002 Q+10000 INDEX Q # POSTJUMP.
043617,000076: 4644 12000 PRIO12 TCF 10000 # PRIO12 = TCF 10000 = 12000
043618,000077:
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Page 999 |
043620,000079: # THE FOLLOWING ROUTINE GETS THE RETURN CADR SAVED BY SWCALL OR BANKCALL AND LEAVES IT IN A.
043621,000080:
043622,000081: 4645 35012 MAKECADR CAF LOW10
043623,000082: 4646 70133 MASK BUF2
043624,000083: 4647 60134 AD BUF2 +1
043625,000084: 4650 00002 TC Q
043626,000085:
043627,000086: 4651 54135 SUPDACAL TS MPTEMP
043628,000087: 4652 56004 XCH FBANK # SET FBANK FOR DATA.
043629,000088: 4653 00006 EXTEND
043630,000089: 4654 04007 ROR SUPERBNK # SAVE FBANK IN BITS 15-11, AND
043631,000090: 4655 56135 XCH MPTEMP # SUPERBANK IN BITS 7-5.
043632,000091: 4656 75012 MASK LOW10
043633,000092: 4657 56001 XCH L # SAVE REL. ADR. IN BANK, FETCH SUPERBITS.
043634,000093: 4660 00004 INHINT # BECAUSE RUPT DOES NOT SAVE SUPERBANK.
043635,000094: 4661 00006 EXTEND
043636,000095: 4662 01007 WRITE SUPERBNK # SET SUPERBANK FOR DATA.
043637,000096: 4663 50001 INDEX L
043638,000097: 4664 32000 CA 10000 # PINBALL (FIX MEM DISP) PREVENTS DCA HERE
043639,000098: 4665 56135 XCH MPTEMP # SAVE 1ST WD, FETCH OLD FBANK AND SBANK.
043640,000099: 4666 00006 EXTEND
043641,000100: 4667 01007 WRITE SUPERBNK # RESTORE SUPERBANK.
043642,000101: 4670 00003 RELINT
043643,000102: 4671 54004 TS FBANK # RESTORE FBANK.
043644,000103: 4672 30135 CA MPTEMP # RECOVER FIRST WORD OF DATA.
043645,000104: 4673 00002 RETURN # 24 WDS. DATACALL 516 MU, SUPDACAL 432 MU
043646,000105:
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Page 1000 |
043648,000107: # THE FOLLOWING ROUTINES ARE IDENTICAL TO BANKCALL AND SWCALL EXCEPT THAT THEY ARE USED IN INTERRUPT.
043649,000108:
043650,000109: 4674 52073 IBNKCALL DXCH RUPTREG3 # USES RUPTREG3,4 FOR DP RETURN ADDRESS.
043651,000110: 4675 50002 INDEX Q
043652,000111: 4676 30000 CAF 0
043653,000112: 4677 24002 INCR Q
043654,000113:
043655,000114: 4700 54001 ISWCALL TS L
043656,000115: 4701 22004 LXCH FBANK
043657,000116: 4702 75012 MASK LOW10
043658,000117: 4703 56002 XCH Q
043659,000118: 4704 52073 DXCH RUPTREG3
043660,000119: 4705 50002 INDEX Q
043661,000120: 4706 02000 TC 10000
043662,000121:
043663,000122: 4707 56073 ISWRETRN XCH RUPTREG4
043664,000123: 4710 56004 XCH FBANK
043665,000124: 4711 56073 XCH RUPTREG4
043666,000125: 4712 00072 TC RUPTREG3
043667,000126:
043668,000127: # 2. USPRCADR ACCESSES INTERPRETIVE CODING IN OTHER THAN THE USER'S FBANK. THE CALLING SEQUENCE IS AS FOLLOWS:
043669,000128: # L TC USPRCADR
043670,000129: # L+1 CADR INTPRETX INTPRETX IS THE INTERPRETIVE CODING
043671,000130: # RETURN IS TO L+2
043672,000131:
043673,000132: 4713 54164 USPRCADR TS LOC # SAVE A
043674,000133: 4714 34744 CA BIT8
043675,000134: 4715 54023 TS EDOP # EXIT INSTRUCTION TO EDOP
043676,000135: 4716 30006 CA BBANK
043677,000136: 4717 54165 TS BANKSET # USER'S BBANK TO BANKSET
043678,000137: 4720 50002 INDEX Q
043679,000138: 4721 30000 CA 0
043680,000139: 4722 54004 TS FBANK # INTERPRETIVE BANK TO FBANK
043681,000140: 4723 75012 MASK LOW10 # YIELDS INTERPRETIVE RELATIVE ADDRESS
043682,000141: 4724 56002 XCH Q # INTERPRETIVE ADDRESS TO Q, FETCHING L+1
043683,000142: 4725 56164 XCH LOC # L+1 TO LOC, RETRIEVING ORIGINAL A
043684,000143: 4726 14643 TCF Q+10000
043685,000144:
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Page 1001 |
043687,000146: # THERE ARE FOUR POSSIBLE SETTINGS FOR CHANNEL 07. (CHANNEL 07 CONTAINS THE SUPERBANK SETTING.)
043688,000147:
043689,000148: # PSEUDO-FIXED OCTAL PSEUDO
043690,000149: # SUPERBANK SETTING S-REG. VALUE BANK NUMBERS ADDRESSES
043691,000150: # ---------- ------- ------------ ------------ ------------
043692,000151: # SUPERBANK 3 0XX 2000 - 3777 30 - 37 70000 - 107777 (WHERE XX CAN BE ANYTHING AND
043693,000152: # WILL USUALLY BE SEEN AS 11)
043694,000153: # SUPERBANK 4 100 2000 - 3777 40 - 47 110000 - 127777 (AS FAR AS IT CAN BE SEEN,
043695,000154: # ONLY BANKS 40-43 WILL EVER BE
043696,000155: # AND ARE PRESENTLY AVAILABLE)
043697,000156: # SUPERBANK 5 101 2000 - 3777 50 - 57 130000 - 147777 (PRESENTLY NOT AVAILABLE TO
043698,000157: # THE USER)
043699,000158: # SUPERBANK 6 110 2000 - 3777 60 - 67 150000 - 167777 (PRESENTLY NOT AVAILABLE TO
043700,000159: # THE USER)
043701,000160: # *** THIS ROUTINE MAY BE CALLED BY ANY PROGRAM LOCATED IN BANKS 00 - 27. I.E., NO PROGRAM LIVING IN ANY
043702,000161: # SUPERBANK SHOULD USE SUPERSW. ***
043703,000162:
043704,000163: # SUPERSW MAY BE CALLED IN THIS FASHION:
043705,000164: # CAF ABBCON WHERE -- ABBCON BBCON SOMETHIN --
043706,000165: # TCR SUPERSW (THE SUPERBNK BITS ARE IN THE BBCON)
043707,000166: # ... ...
043708,000167: # . .
043709,000168: # . .
043710,000169: # OR IN THIS FASHION:
043711,000170: # CAF SUPERSET WHERE SUPERSET IS ONE OF THE FOUR AVAILABLE
043712,000171: # TCR SUPERSW SUPERBANK BIT CONSTANTS:
043713,000172: # ... ... SUPER011 OCTAL 60
043714,000173: # . . SUPER100 OCTAL 100
043715,000174: # . . SUPER101 OCTAL 120
043716,000175: # SUPER110 OCTAL 140
043717,000176:
043718,000177: 4727 00006 SUPERSW EXTEND
043719,000178: 4730 01007 WRITE SUPERBNK # WRITE BITS 7-6-5 OF THE ACCUMULATOR INTO
043720,000179: # CHANNEL 07
043721,000180: 4731 00002 TC Q # TC TO INSTRUCTION FOLLOWING
043722,000181: # TC SUPERSW
043723,000182:
End of include-file INTER-BANK_COMMUNICATION.agc. Parent file is MAIN.agc