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
P70-P71.agc
### FILE="Main.annotation"
## Copyright: Public domain.
## Filename: P70-P71.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. 823-830
## 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.
## 2017-03-10 HG Transcribed
## 2017-03-14 RSB Proofed comment text via 3-way diff vs
## Luminary 99 and 131.
## 2017-03-19 HG Fix operand ROO --> RCO
## Page 823
BANK 21
SETLOC R11
BANK
EBANK= DVCNTR
COUNT* $$/R11
R10,R11 CS FLAGWRD7 # IS SERVICER STILL RUNNING?
MASK AVEGFBIT
CCS A
TCF TASKOVER # LET AVGEND TAKE CARE OF GROUP 2.
CCS PIPCTR
TCF +2
TCF LRHTASK # LAST PASS. CALL LRHTASK.
## Note: The operand "LRHTASK" above is circled with a red pen.
+2 TS PIPCTR1
PIPCTR1 = LADQSAVE
PIPCTR = PHSPRDT2
CAF OCT31
TC TWIDDLE
ADRES R10,R11
R10,R11A CAF HFLSHBIT
FLASHH? MASK FLGWRD11
EXTEND
BZF FLASHV? # H FLASH OFF, SO LEAVE ALONE
CA HLITE
TS L
TC FLIP # FLIP H LITE
FLASHV? CA VFLSHBIT # VFLASHBIT MUST BE BIT 2.
MASK FLGWRD11
EXTEND
BZF 10,11 # V FLASH OFF
CA VLITE
TS L
TC FLIP # FLIP V LITE
10,11 CA FLAGWRD9 # IS THE LETABORT FLAG SET ?
MASK LETABBIT
EXTEND
BZF LANDISP # NO. PROCEED TO R10.
P71NOW? CS MODREG # YES. ARE WE IN P71 NOW?
AD 1DEC71
EXTEND
BZF LANDISP # YES. PROCEED TO R10.
## Page 824
EXTEND # NO. IS AN ABORT STAGE COMMANDED?
READ CHAN30
COM
TS L
MASK BIT4
CCS A
TCF P71A # YES.
P70NOW? CS MODREG # NO. ARE WE IN P70 NOW?
AD 1DEC70
EXTEND
BZF LANDISP # YES. PROCEED TO R10.
CA L # NO. IS AN ABORT COMMANDED?
MASK BIT1
CCS A
TCF P70A # YES.
TCF LANDISP # NO. PROCEED TO R10.
COUNT* $$/P70
P70 TC LEGAL?
P70A CS ZERO
TCF +3
P71 TC LEGAL?
P71A CAF TWO
+3 TS Q
INHINT
EXTEND
DCA CNTABTAD
DTCB
EBANK= DVCNTR
CNTABTAD 2CADR CONTABRT
1DEC70 DEC 70
1DEC71 DEC 71
BANK 05
SETLOC ABORTS1
BANK
COUNT* $$/P70
CONTABRT CAF ABRTJADR
TS BRUPT
RESUME
ABRTJADR TCF ABRTJASK
ABRTJASK CAF OCTAL27
## Page 825
AD Q
TS L
COM
DXCH -PHASE4
INDEX Q
CAF MODE70
TS MODREG
TS DISPDEX # INSURE DISPDEX IS POSITIVE.
CCS Q # SET APSFLAG IF P71.
CS FLGWRD10 # SET APSFLAG PRIOR TO THE ENEMA.
MASK APSFLBIT
ADS FLGWRD10
CS DAPBITS # DAPBITS = OCT 40640 = BITS 6,8,9,15
MASK DAPBOOLS # RESET ULLAGE,DRIFT,XOVRIINH,AND PULSES
TS DAPBOOLS
CAF 1DEGDB # INSURE DAP DEADBAND IS SET TO 1 DEGREE
TS DB
CS FLAGWRD5 # SET ENGONFLG.
MASK ENGONBIT
ADS FLAGWRD5
CS PRIO30 # INSURE THAT THE ENGINE IS ON, IF ARMED.
EXTEND
RAND DSALMOUT
AD BIT13
EXTEND
WRITE DSALMOUT
CAF LRBYBIT # TERMINATE R12.
TS FLGWRD11
CS FLAGWRD0 # SET R10FLAG TO SUPPRESS OUTPUTS TO THE
MASK R10FLBIT # CROSS-POINTER DISPLAY.
ADS FLAGWRD0 # THE FOLLOWING ENEMA WILL REMOVE THE
# DISPLAY INERTIAL DATA OUTBIT.
EXTEND # LOAD TEVENT FOR THE DOWNLINK.
DCA TIME2
DXCH TEVENT
EXTEND
DCA SVEXITAD
DXCH AVGEXIT
TC ABTKLEAN # KILL GROUPS 1,3, AND 6.
## Page 826
CAF THREE # SET UP 4.3SPOT FOR GOABORT
TS L
COM
DXCH -PHASE4
TC POSTJUMP
CADR ENEMA
EBANK= DVCNTR
SVEXITAD 2CADR SERVEXIT
MODE70 DEC 70
OCTAL27 OCT 27
MODE71 DEC 71
DAPBITS OCT 40640
1DEGDB OCT 00554
BANK 32
SETLOC ABORTS
BANK
COUNT* $$/P70
GOABORT CAF FOUR
TS DVCNTR
CAF WHICHADR
TS WHICH
TC INTPRET
CLEAR CLEAR
FLRCS
FLUNDISP
CLEAR SET
IDLEFLAG
ACC4-2FL
SET CALL
P7071FLG
INITCDUW
## Note: Above interpretive operand "INITCDUW" is circled with a black pen.
EXIT
TC CHECKMM
70DEC DEC 70
TCF P71RET
P70INIT TC INTPRET
CALL
TGOCOMP
DLOAD SL
## Page 827
MDOTDPS
4D
BDDV
MASS
STODL TBUP
MASS
DDV SR1
K(1/DV)
STORE 1/DV1
STORE 1/DV2
STORE 1/DV3
BDDV
K(AT)
STODL AT
100PCTTO
STORE TTO
SLOAD DCOMP
DPSVEX
SR2
STCALL VE
COMMINIT
INJTARG DLOAD
ABTRDOT
STCALL RDOTD # INITIALIZE RDOTD.
YCOMP # COMPUTE Y
ABS DSU
YLIM # /Y/-DYMAX
BMN SIGN # IF <0, XR<.5DEG, LEAVE YCO AT 0
YOK # IF >0, FIX SIGN OF DEFICIT, THIS IS YCO.
Y
STORE YCO
YOK DLOAD DSU
YCO
Y
SR
5D
STORE XRANGE
SET CALL
FLVR
THETCOMP
DSU BPL
THETCRIT
+4
VLOAD GOTO
J1PARM
+3
+4 VLOAD
J2PARM
+3 STODL JPARM
RCO
## Page 828
STORE RP
SET EXIT
ROTFLAG
UPTHROT TC THROTUP
TC PHASCHNG
OCT 04024
TC UPFLAG
ADRES FLAP
UPTHROT1 TC BANKCALL # VERIFY THAT THE PANEL SWITCHES
CADR P40AUTO # ARE PROPERLY SET.
TC THROTUP
CAF PRIO17 # LET SERVICER FINISH BEFORE CONNECTING
TC PRIOCHNG # ASCENT GUIDANCE EQUATIONS.
EXTEND
DCA ATMAGAD
DXCH AVGEXIT
GRP4OFF TC PHASCHNG # TERMINATE USE OF GROUP 4.
OCT 00004
TCF ENDOFJOB
P71RET TC DOWNFLAG
ADRES LETABORT
CAF THRESH2 # SET DVMON THRESHOLD TO THE ASCENT VALUE.
TS DVTHRUSH
TC INTPRET
CALL
P12INIT
BON CALL
FLAP
OLDTIME
TGOCOMP # IF FLAP=0, TGO=T-TIG
GOTO
INJTARG
OLDTIME DLOAD SL1 # IF FLAP=1,TGO=2 TGO
TGO
STORE TGO1
EXIT
TC PHASCHNG
## Page 829
OCT 04024
EXTEND
DCA TGO1
DXCH TGO
TCF UPTHROT1
TGO1 = VGBODY
# ************************************************************************
BANK 21
SETLOC R11
BANK
COUNT* $$/P70
LEGAL? CS MMNUMBER # IS THE DESIRED PGM ALREADY IN PROGRESS?
AD MODREG
EXTEND
BZF ABORTALM
CS FLAGWRD9 # ARE THE ABORTS ENABLED?
MASK LETABBIT
CCS A
TCF ABORTALM
CA FLAGWRD7 # IS SERVICER ON THE AIR?
MASK AVEGFBIT
CCS A
TC Q # YES. ALL IS WELL.
ABORTALM TC FALTON
TC RELDSP
TC POSTJUMP
CADR PINBRNCH
BANK 32
SETLOC ABORTS
BANK
COUNT* $$/P70
# ************************************************************************
TGOCOMP RTB DSU
LOADTIME
TIG
SL
11D
STORE TGO
RVQ
## Page 830
# ************************************************************************
THROTUP CAF BIT13
TS THRUST
CAF BIT4
EXTEND
WOR CHAN14
TC Q
# ************************************************************************
10SECS 2DEC 1000
HINJECT 2DEC 18288 B-24 # 60,000 FEET EXPRESSED IN METERS.
(TGO)A 2DEC 37000 B-17
K(AT) 2DEC .02 # SCALING CONSTANT
WHICHADR REMADR ABRTABLE
# ************************************************************************
EBANK= DVCNTR
ATMAGAD 2CADR ATMAG
