93 lines
2.4 KiB
ArmAsm
93 lines
2.4 KiB
ArmAsm
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# Copyright: Public domain.
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# Filename: MYSUBS.agc
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# Purpose: Part of the source code for Colossus 2A, AKA Comanche 055.
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# It is part of the source code for the Command Module's (CM)
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# Apollo Guidance Computer (AGC), for Apollo 11.
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# Assembler: yaYUL
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# Contact: Ron Burkey <info@sandroid.org>.
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# Website: www.ibiblio.org/apollo.
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# Pages: 999-1001
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# Mod history: 2009-05-13 RSB Adapted from the Colossus249/ file of the
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# same name, using Comanche055 page images.
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# 2009-05-20 RSB Corrections: EBANK= changed from MPAC to KMPAC.
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#
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# This source code has been transcribed or otherwise adapted from digitized
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# images of a hardcopy from the MIT Museum. The digitization was performed
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# by Paul Fjeld, and arranged for by Deborah Douglas of the Museum. Many
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# thanks to both. The images (with suitable reduction in storage size and
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# consequent reduction in image quality as well) are available online at
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# www.ibiblio.org/apollo. If for some reason you find that the images are
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# illegible, contact me at info@sandroid.org about getting access to the
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# (much) higher-quality images which Paul actually created.
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#
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# Notations on the hardcopy document read, in part:
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#
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# Assemble revision 055 of AGC program Comanche by NASA
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# 2021113-051. 10:28 APR. 1, 1969
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#
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# This AGC program shall also be referred to as
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# Colossus 2A
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# Page 999
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BANK 20
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SETLOC MYSUBS
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BANK
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EBANK= KMPAC
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SPCOS1 EQUALS SPCOS
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SPSIN1 EQUALS SPSIN
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SPCOS2 EQUALS SPCOS
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SPSIN2 EQUALS SPSIN
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COUNT 21/DAPMS
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# ONE AND ONE HALF PRECISION MULTIPLICATION ROUTINE
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SMALLMP TS KMPTEMP # A(X+Y)
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EXTEND
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MP KMPAC +1
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TS KMPAC +1 # AY
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CAF ZERO
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XCH KMPAC
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EXTEND
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MP KMPTEMP # AX
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DAS KMPAC # AX+AY
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TC Q
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# SUBROUTINE FOR DOUBLE PRECISION ADDITIONS OF ANGLES
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# A AND L CONTAIN A DP(1S) ANGLE SCALED BY 180 DEGS TO BE ADDED TO KMPAC.
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# RESULT IS PLACED IN KMPAC. TIMING = 6 MCT (22 MCT ON OVERFLOW)
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DPADD DAS KMPAC
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EXTEND
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BZF TSK +1 # NO OVERFLOW
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CCS KMPAC
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TCF DPADD+ # + OVERFLOW
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TCF +2
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TCF DPADD- # - OVERFLOW
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CCS KMPAC +1
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TCF DPADD2+ # UPPER = 0, LOWER +
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TCF +2
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COM # UPPER = 0, LOWER -
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AD POSMAX # LOWER = 0, A = 0
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TS KMPAC +1 # CAN NOT OVERFLOW
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CA POSMAX # UPPER WAS = 0
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TSK TS KMPAC
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TC Q
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DPADD+ AD NEGMAX # KMPAC GREATER THAN 0
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TCF TSK
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# Page 1000
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DPADD- COM
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AD POSMAX # KMPAC LESS THAN 0
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TCF TSK
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DPADD2+ AD NEGMAX # CAN NOT OVERFLOW
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TS KMPAC +1
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CA NEGMAX # UPPER WAS = 0
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TCF TSK
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# Page 1001 (empty page)
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