Apollo-11/Luminary099/KALCMANU_STEERING.agc

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# Copyright: Public domain.
# Filename: KALCMANU_STEERING.agc
# Purpose: Part of the source code for Luminary 1A build 099.
# It is part of the source code for the Lunar Module's (LM)
# Apollo Guidance Computer (AGC), for Apollo 11.
# Assembler: yaYUL
# Contact: Ron Burkey <info@sandroid.org>.
# Website: www.ibiblio.org/apollo.
# Pages: 365-369
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# Mod history: 2009-05-17 RSB Adapted from the corresponding
# Luminary131 file, using page
# images from Luminary 1A.
# 2011-01-06 JL Added missing comment characters.
#
# 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 001 of AGC program LMY99 by NASA 2021112-061
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# 16:27 JULY 14, 1969
# Page 365
# GENERATION OF STEERING COMMANDS FOR DIGITAL AUTOPILOT FREE FALL MANEUVERS
#
# NEW COMMANDS WILL BE GENERATED EVERY ONE SECOND DURING THE MANEUVER
EBANK= TTEMP
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NEWDELHI TC BANKCALL # CHECK FOR AUTO STABILIZATION
CADR ISITAUTO # ONLY
CCS A
TCF NOGO -2
NEWANGL TC INTPRET
AXC,1 AXC,2
MIS # COMPUTE THE NEW MATRIX FROM S/C TO
KEL # STABLE MEMBER AXES
CALL
MXM3
VLOAD STADR
STOVL MIS +12D # CALCULATE NEW DESIRED CDU ANGLES
STADR
STOVL MIS +6D
STADR
STORE MIS
AXC,1 CALL
MIS
DCMTOCDU # PICK UP THE NEW CDU ANGLES FROM MATRIX
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RTB
V1STO2S
STORE NCDU # NEW CDU ANGLES
BONCLR EXIT
CALCMAN2
MANUSTAT # TO START MANEUVER
CAF TWO # +0 OTHERWISE
INCRDCDU TS SPNDX
INDEX SPNDX
CA BCDU # INITIAL CDU ANGLES
EXTEND # OR PREVIOUS DESIRED CDU ANGLES
INDEX SPNDX
MSU NCDU
EXTEND
SETLOC KALCMON1
BANK
MP DT/TAU
CCS A # CONVERT TO 2S COMPLEMENT
AD ONE
TCF +2
COM
INDEX SPNDX
TS DELDCDU # ANGLE INCREMENTS TO BE ADDED TO
INDEX SPNDX # CDUXD, CDUYD, CDUZD EVERY TENTH SECOND
# Page 366
CA NCDU # BY LEM DAP
INDEX SPNDX
XCH BCDU
INDEX SPNDX
TS CDUXD
CCS SPNDX
TCF INCRDCDU # LOOP FOR THREE AXES
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RELINT
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# COMPARE PRESENT TIME WITH TIME TO TERMINATE MANEUVER
TMANUCHK TC TIMECHK
TCF CONTMANU
CAF ONE
MANUSTAL INHINT # END MAJOR PART OF MANEUVER WITHIN 1 SEC
TC WAITLIST # UNDER WAITLIST CALL TO MANUSTOP
EBANK= TTEMP
2CADR MANUSTOP
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RELINT
TCF ENDOFJOB
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TIMECHK EXTEND
DCS TIME2
DXCH TTEMP
EXTEND
DCA TM
DAS TTEMP
CCS TTEMP
TC Q
TCF +2
TCF 2NDRETRN
CCS TTEMP +1
TC Q
TCF MANUOFF
COM
MANUOFF AD ONESEK +1
EXTEND
BZMF 2NDRETRN
INCR Q
2NDRETRN INCR Q
TC Q
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DT/TAU DEC .1
MANUSTAT EXIT # INITIALIZATION ROUTINE
EXTEND # FOR AUTOMATIC MANEUVERS
DCA TIME2
# Page 367
DAS TM # TM+TO MANEUVER COMPLETION TIME
EXTEND
DCS ONESEK
DAS TM # (TM+TO)-1
INHINT
CAF TWO
RATEBIAS TS KSPNDX
DOUBLE
TS KDPNDX
INDEX A
CA BRATE
INDEX KSPNDX # STORE MANEUVER RATE IN
TS OMEGAPD # OMEGAPD, OMEGAQD, OMEGARD
EXTEND
BZMF +2 # COMPUTE ATTITUDE ERROR
COM # OFFSET = (WX)ABS(WX)/2AJX
EXTEND # WHERE AJX= 2-JET ACCELERATION
MP BIASCALE # = -1/16
EXTEND
INDEX KDPNDX
MP BRATE
EXTEND
INDEX KSPNDX
DV 1JACC # =AJX $ 90 DEG/SEC-SEC
INDEX KSPNDX
TS DELPEROR # $ 180 DEG
CCS KSPNDX
TCF RATEBIAS
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CA TIME1
AD ONESEK +1
XCH NEXTIME
TCF INCRDCDU -1
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ONESEK DEC 0
DEC 100
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BIASCALE OCT 75777 # = -1/16
CONTMANU CS TIME1 # RESET FOR NEXT DCDU UPDATE
AD NEXTIME
CCS A
AD ONE
TCF MANUCALL
AD NEGMAX
COM
MANUCALL INHINT # CALL FOR NEXT UPDATE VIA WAITLIST
TC WAITLIST
EBANK= TTEMP
2CADR UPDTCALL
# Page 368
CAF ONESEK +1 # INCREMENT TIME FOR NEXT UPDATE
ADS NEXTIME
TCF ENDOFJOB
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UPDTCALL CAF PRIO26 # SATELLITE PROGRAM TO CALL FOR UPDATE
TC FINDVAC # OF STEERING COMMANDS
EBANK= TTEMP
2CADR NEWDELHI
TC TASKOVER
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# Page 369
# ROUTINE FOR TERMINATING AUTOMATIC MANEUVERS
MANUSTOP CAF ZERO # ZERO MANEUVER RATES
TS DELDCDU2
TS OMEGARD
TS DELREROR
TS DELDCDU1
TS OMEGAQD
TS DELQEROR
CA CPSI # SET DESIRED GIMBAL ANGLES TO
TS CDUZD # DESIRED FINAL GIMBAL ANGLES
CA CTHETA
TS CDUYD
ENDROLL CA CPHI # NO FINAL YAW
TS CDUXD
CAF ZERO
TS OMEGAPD # I.E. MANEUVER DID NOT GO THRU
TS DELDCDU # GIMBAL LOCK ORIGINALLY
TS DELPEROR
GOODMANU CA ATTPRIO # RESTORE USERS PRIO
TS NEWPRIO
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CA ZERO # ZERO ATTCADR
DXCH ATTCADR
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TC SPVAC # RETURN TO USER
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TC TASKOVER