https://github.com/virtualagc/virtualagc
Tip revision: 4e5d304eb7cd5589b924ffb8b423b6f15511b35d authored by Ron Burkey on 20 October 2018, 17:47:00 UTC
The sample Block I AGC program TRIVIUM, found at the very end of one of
The sample Block I AGC program TRIVIUM, found at the very end of one of
Tip revision: 4e5d304
P12.agc
### FILE="Main.annotation"
## Copyright: Public domain.
## Filename: P12.agc
## Purpose: A section of Luminary revision 116.
## It is part of the source code for the Lunar Module's (LM)
## Apollo Guidance Computer (AGC) for Apollo 12.
## This file is intended to be a faithful transcription, except
## that the code format has been changed to conform to the
## requirements of the yaYUL assembler rather than the
## original YUL assembler.
## Reference: pp. 831-835
## Assembler: yaYUL
## Contact: Ron Burkey <info@sandroid.org>.
## Website: www.ibiblio.org/apollo/index.html
## Mod history: 2017-01-22 MAS Created from Luminary 99.
## 2017-01-28 RSB Proofed comment text using octopus/prooferComments
## and fixed errors found.
## 2017-03-09 HG Transcribed
## 2017-03-13 RSB Proofed comment text via 3-way diff vs
## Luminary 99 and 131.
## 2017-08-26 MAS Fixed a comment-text error found while transcribing
## Zerlina 56.
## Page 831
BANK 24
SETLOC P12
BANK
EBANK= DVCNTR
COUNT* $$/P12
P12LM TC PHASCHNG
OCT 04024
TC BANKCALL
CADR R02BOTH # CHECK THE STATUS OF THE IMU.
TC CLRADMOD # INITIALIZE RADMODES FOR R29.
CAF THRESH2 # INITIALIZE DVMON
TS DVTHRUSH
CAF FOUR
TS DVCNTR
CA ZERO
TS TRKMKCNT # SHOW THAT R29 DOWNLINK DATA IS NOT READY
CAF V06N33A
TC BANKCALL # FLASH TIG
CADR GOFLASH
TCF GOTOPOOH
TCF +2 # PROCEED
TCF -5 # ENTER
TC PHASCHNG
OCT 04024
TC INTPRET
SET SET
MUNFLAG
ACC4-2FL
SET CLEAR
R10FLAG
RNDVZFLG
SET SET
FLPI
FLVR
CALL # INITIALIZE WM AND /LAND/
GUIDINIT
CALL
P12INIT
P12LMB DLOAD
(TGO)A # SET TGO TO AN INITIAL NOMINAL VALUE.
STODL TGO
## Page 832
TIG
STCALL TDEC1
LEMPREC # ROTATE THE STATE VECTORS TO THE
VLOAD MXV # IGNITION TIME.
VATT
REFSMMAT
VSL1
STOVL V1S # COMPUTE V1S = VEL(TIG)*2(-7) M/CS.
RATT
MXV VSL6
REFSMMAT
STCALL R # COMPUTE R = POS(TIG)*2(-24)M.
MUNGRAV # COMPUTE GDT1/2(TIG)*2(-7)M/CS.
VLOAD UNIT
R
STCALL UNIT/R/ # COMPUTE UNIT/R/ FOR YCOMP.
YCOMP
SR DCOMP
5D
STODL XRANGE # INITIALIZE XRANGE FOR NOUN 76.
VINJNOM
STODL ZDOTD
RDOTDNOM
STORE RDOTD
EXIT
TC PHASCHNG
OCT 04024
NEWLOAD CAF V06N76 # FLASH CROSS-RANGE AND APOLUNE VALUES.
TC BANKCALL
CADR GOFLASH
TCF GOTOPOOH
TCF +2 # PROCEED
TCF NEWLOAD # ENTER NEW DATA.
CAF P12ADRES
TS WHICH
TC PHASCHNG
OCT 04024
TC INTPRET
DLOAD SL
XRANGE
5D
DAD
Y
STOVL YCO
UNIT/R/
## Page 833
VXSC VAD
49FPS
V1S
STORE V # V(TIPOVER) = V(IGN) + 57FPS (UNIT/R/)
DOT SL1
UNIT/R/
STOVL RDOT # RDOT * 2(-7)
UNIT/R/
VXV UNIT
QAXIS
STCALL ZAXIS1
ASCENT
P12RET DLOAD
ATP # ATP(2)*2(18)
DSQ PDDL
ATY # ATY(2)*2(18)
DSQ DAD
BZE SQRT
YAWDUN
SL1 BDDV
ATY
ARCSIN
YAWDUN STOVL YAW
UNFC/2
UNIT DOT
UNIT/R/
SL1 ARCCOS
DCOMP
STORE PITCH
EXIT
TC PHASCHNG
OCT 04024
INHINT
TC IBNKCALL
CADR PFLITEDB
TC DOWNFLAG
ADRES FLPI
TC POSTJUMP
CADR BURNBABY
P12INIT DLOAD # INITIALIZE ENGINE DATA. USED FOR P12 AND
(1/DV)A # P71.
STORE 1/DV3
STORE 1/DV2
STODL 1/DV1
(AT)A
STODL AT
(TBUP)A
## Page 834
STODL TBUP
ATDECAY
DCOMP SL
11D
STORE TTO
SLOAD DCOMP
APSVEX
SR2
STORE VE
BOFF RVQ
FLAP
COMMINIT
COMMINIT DLOAD DAD # INITIALIZE TARGET DATA. USED BY P12, P70
HINJECT # AND P71 IF IT DOES NOT FOLLOW P70.
/LAND/
STODL RCO
HI6ZEROS
STORE TXO
STORE YCO
STOVL YDOTD
VRECTCSM
VXV MXV
RRECTCSM
REFSMMAT
UNIT
STORE QAXIS
RVQ
P12ADRES REMADR P12TABLE
SETLOC ASENT8
BANK
COUNT* $$/P12
GUIDINIT STQ SETPD
TEMPR60
0D
VLOAD PUSH
UNITZ
RTB PUSH
LOADTIME
CALL
RP-TO-R
MXV VXSC
REFSMMAT
MOONRATE
STOVL WM
RLS
ABVAL SL3
STCALL /LAND/
## Page 835
TEMPR60
49FPS 2DEC .149352 B-6 # EXPECTED RDOT AT TIPOVER
VINJNOM 2DEC 16.7924 B-7 # 5509.5 FPS(APO=30NM WITH RDOT=19.5FPS)
RDOTDNOM 2DEC .059436 B-7 # 19.5 FPS
