Source Code
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This is an attempt to recreate Luminary 99 Rev 2, otherwise known as LUM99R2, from Luminary 99 Rev 1 and ephemeris data from Luminary 116. The differences are confined to the last 10-12 lines of the CONTROLLED CONSTANTS. Luminary 99 Rev 1 source-code was transcribed from a printout in the MIT Museum, while Luminary 116 source code was transcribed from a printout belonging to Don Eyles. AGC developer James Kernan, the "rope mother" for the Apollo 11 Lunar Module's AGC, explains as follows: "At the last minute, Dan Lickly, our chief engineer, appeared with ephemerides updates and it took two tries to get it right. The result was that we created Lum99 Revision 1 and Lum99 Revision 2." It is suspected that the former is what's in the MIT Museum, and the latter is what we are trying to recreate here. As for which revision actually flew in Apollo 11, all of the other available surviving evidence points to Rev 1 rather than to Rev 2, so we're just not sure! |
042740,000002: ## Copyright: Public domain.
042741,000003: ## Filename: INTER-BANK_COMMUNICATION.agc
042742,000004: ## Purpose: Part of the source code for Luminary 1A build 099.
042743,000005: ## It is part of the source code for the Lunar Module's (LM)
042744,000006: ## Apollo Guidance Computer (AGC), for Apollo 11.
042745,000007: ## Assembler: yaYUL
042746,000008: ## Contact: Ron Burkey <info@sandroid.org>.
042747,000009: ## Website: www.ibiblio.org/apollo.
042748,000010: ## Pages: 998-1001
042749,000011: ## Mod history: 2009-05-24 RSB Adapted from the corresponding
042750,000012: ## Luminary131 file, using page
042751,000013: ## images from Luminary 1A.
042752,000014: ## 2011-05-08 JL Removed workaround.
042753,000015: ## 2016-12-17 RSB Proofed text comments with octopus/ProoferComments
042754,000016: ## and corrected the errors found.
042755,000017: ## 2017-03-03 RSB Snapshot of Luminary 99 Rev 1.
042756,000018: ## 2017-03-13 RSB Comment-text fixes noted in proofing Luminary 116.
042757,000019: ## 2017-03-17 RSB Comment-text fixes identified in diff'ing
042758,000020: ## Luminary 99 vs Comanche 55.
042759,000021:
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Page 998 |
042761,000023: # THE FOLLOWING ROUTINE CAN BE USED TO CALL A SUBROUTINE IN ANOTHER BANK. IN THE BANKCALL VERSION, THE
042762,000024: # CADR OF THE SUBROUTINE IMMEDIATELY FOLLOWS THE TC BANKCALL INSTRUCTION, WITH C(A) AND C(L) PRESERVED.
042763,000025:
042764,000026: 4616 BLOCK 02
042765,000027: 4616 COUNT* $$/BANK
042766,000028: 4616 52134 BANKCALL DXCH BUF2 # SAVE INCOMING A,L.
042767,000029: 4617 50002 INDEX Q # PICK UP CADR.
042768,000030: 4620 30000 CA 0
042769,000031: 4621 24002 INCR Q # SO WE RETURN TO THE LOC. AFTER THE CADR.
042770,000032:
042771,000033: # SWCALL IS IDENTICAL TO BANKCALL, EXCEPT THAT THE CADR ARRIVES IN A.
042772,000034:
042773,000035: 4622 54001 SWCALL TS L
042774,000036: 4623 22004 LXCH FBANK # SWITCH BANKS, SAVING RETURN.
042775,000037: 4624 75012 MASK LOW10 # GET SUB-ADDRESS OF CADR.
042776,000038: 4625 56002 XCH Q # A,L NOW CONTAINS DP RETURN.
042777,000039: 4626 52134 DXCH BUF2 # RESTORING INPUTS IF THIS IS A BANKCALL.
042778,000040: 4627 50002 INDEX Q
042779,000041: 4630 02000 TC 10000 # SETTING Q TO SWRETURN.
042780,000042:
042781,000043: 4631 56134 SWRETURN XCH BUF2 +1 # COMES HERE TO RETURN TO CALLER. C(A,L)
042782,000044: 4632 56004 XCH FBANK # ARE PRESERVED FOR RETURN.
042783,000045: 4633 56134 XCH BUF2 +1
042784,000046: 4634 00133 TC BUF2
042785,000047:
042786,000048: # THE FOLLOWING ROUTINE CAN BE USED AS A UNILATERAL JUMP WITH C(A,L) PRESERVED AND THE CADR IMMEDIATELY
042787,000049: # FOLLOWING THE TC POSTJUMP INSTRUCTION.
042788,000050:
042789,000051: 4635 56002 POSTJUMP XCH Q # SAVE INCOMING C(A).
042790,000052: 4636 50000 INDEX A # GET CADR.
042791,000053: 4637 30000 CA 0
042792,000054:
042793,000055: # BANKJUMP IS THE SAME AS POSTJUMP, EXCEPT THAT THE CADR ARRIVES IN A.
042794,000056:
042795,000057: 4640 54004 BANKJUMP TS FBANK
042796,000058: 4641 75012 MASK LOW10
042797,000059: 4642 56002 XCH Q # RESTORING INPUT C(A) IF THIS WAS A
042798,000060: 4643 50002 Q+10000 INDEX Q # POSTJUMP.
042799,000061: 4644 12000 PRIO12 TCF 10000 # PRIO12 = TCF 10000 = 12000
042800,000062:
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Page 999 |
042802,000064: # THE FOLLOWING ROUTINE GETS THE RETURN CADR SAVED BY SWCALL OR BANKCALL AND LEAVES IT IN A.
042803,000065:
042804,000066: 4645 35012 MAKECADR CAF LOW10
042805,000067: 4646 70133 MASK BUF2
042806,000068: 4647 60134 AD BUF2 +1
042807,000069: 4650 00002 TC Q
042808,000070:
042809,000071: 4651 54135 SUPDACAL TS MPTEMP
042810,000072: 4652 56004 XCH FBANK # SET FBANK FOR DATA.
042811,000073: 4653 00006 EXTEND
042812,000074: 4654 04007 ROR SUPERBNK # SAVE FBANK IN BITS 15-11, AND
042813,000075: 4655 56135 XCH MPTEMP # SUPERBANK IN BITS 7-5.
042814,000076: 4656 75012 MASK LOW10
042815,000077: 4657 56001 XCH L # SAVE REL. ADR. IN BANK, FETCH SUPERBITS.
042816,000078: 4660 00004 INHINT # BECAUSE RUPT DOES NOT SAVE SUPERBANK.
042817,000079: 4661 00006 EXTEND
042818,000080: 4662 01007 WRITE SUPERBNK # SET SUPERBANK FOR DATA.
042819,000081: 4663 50001 INDEX L
042820,000082: 4664 32000 CA 10000 # PINBALL (FIX MEM DISP) PREVENTS DCA HERE
042821,000083: 4665 56135 XCH MPTEMP # SAVE 1ST WD, FETCH OLD FBANK AND SBANK.
042822,000084: 4666 00006 EXTEND
042823,000085: 4667 01007 WRITE SUPERBNK # RESTORE SUPERBANK.
042824,000086: 4670 00003 RELINT
042825,000087: 4671 54004 TS FBANK # RESTORE FBANK.
042826,000088: 4672 30135 CA MPTEMP # RECOVER FIRST WORD OF DATA.
042827,000089: 4673 00002 RETURN # 24 WDS. DATACALL 516 MU, SUPDACAL 432 MU
042828,000090:
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Page 1000 |
042830,000092: # THE FOLLOWING ROUTINES ARE IDENTICAL TO BANKCALL AND SWCALL EXCEPT THAT THEY ARE USED IN INTERRUPT.
042831,000093:
042832,000094: 4674 52073 IBNKCALL DXCH RUPTREG3 # USES RUPTREG3,4 FOR DP RETURN ADDRESS.
042833,000095: 4675 50002 INDEX Q
042834,000096: 4676 30000 CAF 0
042835,000097: 4677 24002 INCR Q
042836,000098:
042837,000099: 4700 54001 ISWCALLL TS L
042838,000100: 4701 22004 LXCH FBANK
042839,000101: 4702 75012 MASK LOW10
042840,000102: 4703 56002 XCH Q
042841,000103: 4704 52073 DXCH RUPTREG3
042842,000104: 4705 50002 INDEX Q
042843,000105: 4706 02000 TC 10000
042844,000106:
042845,000107: 4707 56073 ISWRETRN XCH RUPTREG4
042846,000108: 4710 56004 XCH FBANK
042847,000109: 4711 56073 XCH RUPTREG4
042848,000110: 4712 00072 TC RUPTREG3
042849,000111:
042850,000112: # 2. USPRCADR ACCESSES INTERPRETIVE CODING IN OTHER THAN THE USER'S FBANK. THE CALLING SEQUENCE IS AS FOLLOWS:
042851,000113: # L TC USPRCADR
042852,000114: # L+1 CADR INTPRETX INTPRETX IS THE INTERPRETIVE CODING
042853,000115: # RETURN IS TO L+2
042854,000116:
042855,000117: 4713 54164 USPRCADR TS LOC # SAVE A
042856,000118: 4714 34744 CA BIT8
042857,000119: 4715 54023 TS EDOP # EXIT INSTRUCTION TO EDOP
042858,000120: 4716 30006 CA BBANK
042859,000121: 4717 54165 TS BANKSET # USER'S BBANK TO BANKSET
042860,000122: 4720 50002 INDEX Q
042861,000123: 4721 30000 CA 0
042862,000124: 4722 54004 TS FBANK # INTERPRETIVE BANK TO FBANK
042863,000125: 4723 75012 MASK LOW10 # YIELDS INTERPRETIVE RELATIVE ADDRESS
042864,000126: 4724 56002 XCH Q # INTERPRETIVE ADDRESS TO Q, FETCHING L+1
042865,000127: 4725 56164 XCH LOC # L+1 TO LOC, RETRIEVING ORIGINAL A
042866,000128: 4726 14643 TCF Q+10000
042867,000129:
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Page 1001 |
042869,000131: # THERE ARE FOUR POSSIBLE SETTINGS FOR CHANNEL 07. (CHANNEL 07 CONTAINS THE SUPERBANK SETTING.)
042870,000132:
042871,000133: # PSEUDO-FIXED OCTAL PSEUDO
042872,000134: # SUPERBANK SETTING S-REG. VALUE BANK NUMBERS ADDRESSES
042873,000135: # ---------- ------- ------------ ------------ ------------
042874,000136: # SUPERBANK 3 0XX 2000 - 3777 30 - 37 70000 - 107777 (WHERE XX CAN BE ANYTHING AND
042875,000137: # WILL USUALLY BE SEEN AS 11)
042876,000138: # SUPERBANK 4 100 2000 - 3777 40 - 47 110000 - 127777 (AS FAR AS IT CAN BE SEEN,
042877,000139: # ONLY BANKS 40-43 WILL EVER BE
042878,000140: # AND ARE PRESENTLY AVAILABLE)
042879,000141: # SUPERBANK 5 101 2000 - 3777 50 - 57 130000 - 147777 (PRESENTLY NOT AVAILABLE TO
042880,000142: # THE USER)
042881,000143: # SUPERBANK 6 110 2000 - 3777 60 - 67 150000 - 167777 (PRESENTLY NOT AVAILABLE TO
042882,000144: # THE USER)
042883,000145: # *** THIS ROUTINE MAY BE CALLED BY ANY PROGRAM LOCATED IN BANKS 00 - 27. I.E., NO PROGRAM LIVING IN ANY
042884,000146: # SUPERBANK SHOULD USE SUPERSW. ***
042885,000147:
042886,000148: # SUPERSW MAY BE CALLED IN THIS FASHION:
042887,000149: # CAF ABBCON WHERE -- ABBCON BBCON SOMETHIN --
042888,000150: # TCR SUPERSW (THE SUPERBNK BITS ARE IN THE BBCON)
042889,000151: # ... ...
042890,000152: # . .
042891,000153: # . .
042892,000154: # OR IN THIS FASHION:
042893,000155: # CAF SUPERSET WHERE SUPERSET IS ONE OF THE FOUR AVAILABLE
042894,000156: # TCR SUPERSW SUPERBANK BIT CONSTANTS:
042895,000157: # ... ... SUPER011 OCTAL 60
042896,000158: # . . SUPER100 OCTAL 100
042897,000159: # . . SUPER101 OCTAL 120
042898,000160: # SUPER110 OCTAL 140
042899,000161:
042900,000162: 4727 00006 SUPERSW EXTEND
042901,000163: 4730 01007 WRITE SUPERBNK # WRITE BITS 7-6-5 OF THE ACCUMULATOR INTO
042902,000164: # CHANNEL 07
042903,000165: 4731 00002 TC Q # TC TO INSTRUCTION FOLLOWING
042904,000166: # TC SUPERSW
042905,000167:
End of include-file INTER-BANK_COMMUNICATION.agc. Parent file is MAIN.agc