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RCS-CSM_DAP_EXECUTIVE_PROGRAMS.s
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RCS-CSM_DAP_EXECUTIVE_PROGRAMS.s
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# Copyright: Public domain.
# Filename: RCS-CSM_DAP_EXECUTIVE_PROGRAMS.agc
# Purpose: Part of the source code for Colossus 2A, AKA Comanche 055.
# It is part of the source code for the Command Module's (CM)
# Apollo Guidance Computer (AGC), for Apollo 11.
# Assembler: yaYUL
# Contact: Ron Burkey <info@sandroid.org>.
# Website: www.ibiblio.org/apollo.
# Pages: 1037-1038
# Mod history: 2009-05-13 RSB Adapted from the Colossus249/ file of the
# same name, using Comanche055 page images.
# 2009-05-20 RSB A "Page N" comment was corrected.
#
# This source code has been transcribed or otherwise adapted from digitized
# images of a hardcopy from the MIT Museum. The digitization was performed
# by Paul Fjeld, and arranged for by Deborah Douglas of the Museum. Many
# thanks to both. The images (with suitable reduction in storage size and
# consequent reduction in image quality as well) are available online at
# www.ibiblio.org/apollo. If for some reason you find that the images are
# illegible, contact me at info@sandroid.org about getting access to the
# (much) higher-quality images which Paul actually created.
#
# Notations on the hardcopy document read, in part:
#
# Assemble revision 055 of AGC program Comanche by NASA
# 2021113-051. 10:28 APR. 1, 1969
#
# This AGC program shall also be referred to as
# Colossus 2A
# Page 1037
# CALCULATION OF AMGB, AMBG ONCE EVERY SECOND
#
# AMGB = 1 SIN(PSI) 0
# 0 COS(PSI)COS(PHI) SIN(PHI)
# 0 -COS(PSI)SIN(PHI) COS(PHI)
#
# AMBG = 1 -TAN(PSI)COS(PHI) TAN(PSI)SIN(PHI)
# 0 COS(PHI)/COS(PSI) -SIN(PHI)/COS(PSI)
# 0 SIN(PHI) COS(PHI)
#
# WHERE PHI AND PSI ARE CDU ANGLES
BANK 20
SETLOC DAPS8
BANK
COUNT* $$/DAPEX
EBANK= KMPAC
AMBGUPDT CA FLAGWRD6 # CHECK FOR RCS AUTOPILOT
EXTEND
BZMF ENDOFJOB # BIT15 = 0, BIT14 = 1
MASK BIT14 # IF NOT RCS, EXIT
EXTEND
BZF ENDOFJOB # TO PROTECT TVC DAP ON SWITCHOVER
CA CDUZ
TC SPSIN2
TS AMGB1 # CALCULATE AMGB
CA CDUZ
TC SPCOS2
TS CAPSI # MUST CHECK FOR GIMBAL LOCK
CAF QUADANGL # = 7.25 DEGREES JET QUAD ANGULAR OFFSET
EXTEND
MSU CDUX
COM # CDUX - 7.25 DEG
TC SPCOS1
TS AMGB8
EXTEND
MP CAPSI
TS AMGB4
CAF QUADANGL
EXTEND
MSU CDUX
COM # CDUX - 7.25 DEG
TC SPSIN1
TS AMGB5
EXTEND
MP CAPSI
COM
# Page 1038
TS AMGB7
TCF ENDOFJOB
QUADANGL DEC 660 # = 7.25 DEGREES