415 lines
10 KiB
Plaintext
415 lines
10 KiB
Plaintext
# Copyright: Public domain.
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# Filename: TVCINITIALIZE.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: Jim Lawton <jim.lawton@gmail.com>.
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# Website: www.ibiblio.org/apollo.
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# Pages: 936-944
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# Mod history: 2009-05-11 JVL Adapted from the Colossus249/ file
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# of the same name, using Comanche055 page
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# images.
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# 2009-05-20 RSB Corrections: +80 -> +8D, added 4 missing
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# lines in TVCINIT1, changed the capitalization
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# of a couple of the "Page N" comments,
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# corrected a couple of lines in LOADCOEFF.
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# 2009-05-22 RSB In LOADCOEF, DXCH N10 +14D corrected to
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# TS N10 +14D. Also, various comment-marks
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# were added to comments following this
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# change.
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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 937
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# NAME TVCDAPON (TVC DAP INITIALIZATION AND STARTUP CALL)
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# LOG SECTION...TVCINITIALIZE SUBROUTINE...DAPCSM
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# MODIFIED BY SCHLUNDT 21 OCTOBER 1968
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# FUNCTIONAL DESCRIPTION
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# PERFORMS TVCDAP INITIALIZATION (GAINS, TIMING PARAMETERS, FILTER VARIABLES, ETC.)
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# COMPUTES STEERING (S40.8) GAIN KPRIMEDT, AND ZEROES PASTDELV,+1 VARIABLE
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# MAKES INITIALIZATION CALL TO "NEEDLER" FOR TVC DAP NEEDLES-SETUP
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# PERFORMS INITIALIZATION FOR ROLL DAP
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# CALLS TVCEXECUTIVE AT TVCEXEC, VIA WAITLIST
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# CALLS TVCDAP CDU-RATE INITIALIZATION PKG AT DAPINIT VIA T5
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# PROVIDES FOR LOADING OF LOW-BANDWIDTH COEFFS AND GAINS AT SWICHOVR
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# CALLING SEQUENCE - T5LOC=2CADR(TVCDAPON,EBANK=BZERO), T5=.6SECT5
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# IN PARTICULAR, CALLED BY "DOTVCON" IN P40
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# MRCLEAN AND TVCINIT4 ARE POSSIBLE TVC-RESTART ENTRY POINTS
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# NORMAL EXIT MODE
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# TCF RESUME
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# SUBROUTINES CALLED
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# NEEDLER, MASSPROP
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# ALARM OR ABORT EXIT MODES
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# NONE
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# ERASABLE INITIALIZATION REQUIRED
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# CSMMASS, LEMMASS, DAPDATR1 (FOR MASSPROP SUBROUTINE)
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# TVC PAD LOADS (SEE EBANK6 IN ERASABLE ASSIGNMENTS)
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# PACTOFF, YACTOFF, CDUX
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# TVCPHASE AND THE T5 BITS OF FLAGWRD6 (SET AT DOTVCON IN P40)
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# OUTPUT
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# ALL TVC AND ROLL DAP ERASABLES, FLAGWRD6 (BITS 13,14), T5, WAITLIST
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# DEBRIS
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# NONE
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COUNT* $$/INIT
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BANK 17
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SETLOC DAPS7
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BANK
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EBANK= BZERO
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TVCDAPON LXCH BANKRUPT # T5 RUPT ARRIVAL (CALL BY DOTVCON - P40)
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EXTEND # SAVE Q REQUIRED IN RESTART (MRCLEAN AND
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QXCH QRUPT # TVCINIT4 ARE ENTRIES)
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MRCLEAN CAF NZERO # NUMBER TO ZERO, LESS ONE (MUST BE ODD)
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# TVC RESTARTS ENTER HERE (NEW BANK)
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+1 CCS A
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TS CNTR
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CAF ZERO
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TS L
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INDEX CNTR
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DXCH OMEGAYC # FIRST (LAST) TWO LOCATIONS
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CCS CNTR
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TCF MRCLEAN +1
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# Page 938
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EXTEND # SET UP ANOTHER T5 RUPT TO CONTINUE
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DCA INITLOC2 # INITIALIZATION AT TVCINIT1
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DXCH T5LOC # THE PHSCHK2 ENTRY (REDOTVC) AT TVCDAPON
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CAF POSMAX # +3 IS IN ANOTHER BANK. MUST RESET
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TS TIME5 # BBCON TOO (FULL 2CADR), FOR THAT
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ENDMRC TCF RESUME # ENTRY.
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TVCINIT1 LXCH BANKRUPT
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EXTEND
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QXCH QRUPT
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TC IBNKCALL # UPDATE IXX, IAVG/TLX FOR DAP GAINS (R03
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CADR MASSPROP # OR NOUNS 46 AND 47 MUST BE CORRECT)
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CAE EMDOT # SPS FLOW RATE, SCALED B+3 KG/CS
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EXTEND
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MP ONETHOU
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TS TENMDOT # 10-SEC MASS LOSS B+16 KG
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COM
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AD CSMMASS
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TS MASSTMP # DECREMENT FOR FIRST 10 SEC OF BURN
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CAE DAPDATR1 # CHECK LEM-ON/OFF
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MASK BIT14
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CCS A
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CAF BIT1 # LEM-ON (BIT1)
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TS CNTR # LEM-OFF (ZERO)
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INDEX CNTR # LOAD THE FILTER COEFFICIENTS
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CAF CSMCFADR
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TS COEFFADR
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TC LOADCOEF
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INDEX CNTR # PICK UP LM-OFF,-ON KTLX/I
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CAE EKTLX/I # SCALED AT 1/(8 ASCREV) OF ACTUAL VALUE
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TS KTLX/I
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TCR S40.15 # COMPUTE 1/CONACC, VARK
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TVCINIT2 CS CNTR # PICK LM-OFF,-ON VALUE FOR FILTER PERIOD
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INDEX A # DETERMINATION:
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CAF BIT2 # BIT2 FOR CSM ONLY 40MS FILTER
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TS KPRIMEDT # BIT3 FOR CSM/LM 80MS FILTER
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COM # PREPARE T5TVCDT
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AD POSMAX
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AD BIT1
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TS T5TVCDT
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CS BIT15 # RESET SWTOVER FLAG
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# Page 939
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MASK FLAGWRD9
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TS FLAGWRD9
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INDEX CNTR # PICK UP LEM-OFF,-ON KPRIME
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CAE EKPRIME # SCALED (100 PI)/16
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EXTEND
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MP KPRIMEDT # (TVCDT/2, SC.AT B+14 CS)
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LXCH A # SC.AT PI/8 (DIMENSIONLESS)
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DXCH KPRIMEDT
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INDEX CNTR # PICK UP LEM-OFF,-ON REPFRAC
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CAE EREPFRAC
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TS REPFRAC
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INDEX CNTR # PICK UP ONE-SHOT CORRECTION TIME
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CAF TCORR
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TS CNTR
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CAF NEGONE # PREVENT STROKE TEST UNTIL CALLED
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TS STRKTIME
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CAF NINETEEN # SET VCNTR FOR VARIABLE-GAIN UPDATES IN
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TS VCNTR # 10 SECONDS (TVCEXEC 1/2 SEC RATE)
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TS V97VCNTR # FOR ENGFAIL (R41) LOGIC
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TVCINIT3 CAE PACTOFF # TRIM VALUES TO TRIM-TRACKERS, OUTPUT
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TS PDELOFF # TRACKERS, OFFSET-UPDATES, AND
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TS PCMD # OFFSET-TRACKER FILTERS
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TS DELPBAR # NOTE, LO-ORDER DELOFF,DELBAR ZEROED
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CAE YACTOFF
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TS YDELOFF
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TS YCMD
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TS DELYBAR
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ATTINIT CAE DAPDATR1 # ATTITUDE-ERROR INITIALIZATION LOGIC
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MASK BIT13 # TEST FOR CSM OR CSM/LM
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EXTEND
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BZF NEEDLEIN # BYPASS INITIALIZATION FOR CSM/LM
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CAF BIT1 # SET UP TEMPORARY COUNTER
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+5 TS TTMP1
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INDEX TTMP1
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CA ERRBTMP # ERRBTMP CONTAINS RCS ATTITUDE ERRORS
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EXTEND # ERRORY & ERRORZ (P40 AT DOTVCON)
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MP 1/ATTLIM # .007325(ERROR) = 0 IF ERROR < 1.5 DEG
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EXTEND
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BZF +8D # |ERROR| LESS THAN 1.5 DEG
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EXTEND
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# Page 940
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BZMF +3 # |ERROR| > 1.5 DEG, AND NEG
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CA ATTLIM # |ERROR| > 1.5 DEG, AND POS
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TCF +2
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+3 CS ATTLIM
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+2 INDEX TTMP1
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TS ERRBTMP
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+8 CCS TTMP1 # TEST TEMPORARY COUNTER
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TCF ATTINIT +5 # BACK TO REPEAT FOR PITCH ERROR
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CA ERRBTMP # ERRORS ESTABLISHED AND LIMITED
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TS PERRB
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CA ERRBTMP +1
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TS YERRB
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NEEDLEIN CS RCSFLAGS # SET BIT 3 FOR INITIALIZATION PASS AND GO
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MASK BIT3 # TO NEEDLER. WILL CLEAR FOR TVC DAP
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ADS RCSFLAGS # (RETURNS AFTER CADR)
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TC IBNKCALL
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CADR NEEDLER
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TVCINIT4 CAF ZERO # SET TVCPHASE TO INDICATE TVCDAPON-THRU-
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TS TVCPHASE # NEEDLEIN INITIALIZATION FINISHED.
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# (POSSIBLE TVC-RESTART ENTRY)
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CAE CDUX # PREPARE ROLL DAP
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TS OGANOW
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CAF BIT13 # IF ENGINE IS ALREADY OFF, ENGINOFF HAS
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EXTEND # ALREADY ESTABLISHED THE POST-BURN
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RAND DSALMOUT # CSMMASS (MASSBACK DOES IT). DON'T
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EXTEND # TOUCH CSMMASS. IF ENGINE IS ON,
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BZF +3 # THEN IT'S OK TO DO THE COPYCYCLE
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# EVEN BURNS LESS THAN 0.4 SEC ARE AOK
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CAE MASSTMP # COPYCYCLE
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TS CSMMASS
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+3 CAF .5SEC # CALL TVCEXECUTIVE (ROLLDAP CALL, ETC)
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TC WAITLIST
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EBANK= BZERO
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2CADR TVCEXEC
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EXTEND # CALL FOR DAPINIT
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DCA DAPINIT5
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DXCH T5LOC
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CAE T5TVCDT # (ALLOW TIME FOR RESTART COMPUTATIONS)
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TS TIME5
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# Page 941
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ENDTVCIN TCF RESUME
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PRESWTCH TCR SWICHOVR # ENTRY FROM V46
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TC POSTJUMP # THIS PROVIDES AN EXIT FROM SWITCH-OVER
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CADR PINBRNCH # (PINBRNCH DOES A RELINT)
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SWICHOVR INHINT
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CA TVCPHASE # SAVE TVCPHASE
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TS PHASETMP
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CS BIT2 # SET TVCPHASE = -2 (INDICATES SWITCH-OVER
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TS TVCPHASE # TO RESTART LOGIC)
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+5 EXTEND # SAVE Q FOR RETURN (RESTART ENTRY POINT,
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QXCH RTRNLOC # TVCPHASE AND PHASETMP ALREADY SET)
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CAF NZEROJR # ZEROING LOOP FOR FILTER STORAGE LOCS
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+8 TS CNTRTMP
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MCLEANJR CA ZERO
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TS L
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INDEX CNTRTMP
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DXCH PTMP1 -1
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CCS CNTRTMP
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CCS A
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TCF SWICHOVR +8D
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CS FLAGWRD9 # SET SWITCHOVER FLAG FOR DOWNLINK
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MASK BIT15
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ADS FLAGWRD9
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CAE EKTLX/I +2 # LOW BANDWIDTH GAINS - DAP
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TS KTLX/I
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TCR S40.15 +7
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CAF FKPRIMDT # - STEERING
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TS KPRIMEDT
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CAF FREPFRAC # - TMC LOOP
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TS REPFRAC
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EXTEND # UPDATE TRIM ESTIMATES
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DCA DELPBAR
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DXCH PDELOFF
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EXTEND
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DCA DELYBAR
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DXCH YDELOFF
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CA LBCFADR
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# Page 942
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TS COEFFADR
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TC LOADCOEF
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CAE PHASETMP # RESTORE TVCPHASE
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TS TVCPHASE
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TC RTRNLOC # BACK TO PRESWTCH OR TVCRESTARTS
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LOADCOEF EXTEND # LOAD DAP FILTER COEFFICIENTS
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INDEX COEFFADR # FROM: ERASABLE FOR CSM/LM HB
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DCA 0 # FIXED FOR CSM/LM LB
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DXCH N10 # FIXED FOR CSM
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EXTEND # NOTE: FOR CSM/LM, NORMAL COEFFICIENT
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INDEX COEFFADR # LOAD WILL BE HIGH BANDWIDTH PAD LOAD
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DCA 2 # ERASABLES. DURING CSM/LM SWITCHOVER,
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DXCH N10 +2 # THIS LOGIC IS USED TO LOAD LOW BANDWIDTH
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# COEFFICIENTS FROM FIXED MEMORY.
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EXTEND
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INDEX COEFFADR
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DCA 4
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DXCH N10 +4
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EXTEND
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INDEX COEFFADR
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DCA 6
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DXCH N10 +6
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EXTEND
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INDEX COEFFADR
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DCA 8D
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DXCH N10 +8D
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EXTEND
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INDEX COEFFADR
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DCA 10D
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DXCH N10 +10D
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EXTEND
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INDEX COEFFADR
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DCA 12D
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DXCH N10 +12D
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INDEX COEFFADR
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CA 14D
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TS N10 +14D
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TC Q
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# Page 943
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S40.15 CAE IXX # GAIN COMPUTATIONS (1/CONACC, VARK)
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EXTEND # ENTERED FROM TVCINITIALIZE AND TVCEXEC
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MP 2PI/M # 2PI/M SCALED 1/(B+8 N M)
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DDOUBL # IXX SCALED B+20 KG-MSQ
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DDOUBL
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DDOUBL
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TS 1/CONACC # SCALED B+9 SEC-SQ/REV
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+7 CAE KTLX/I # ENTRY FROM CSM/LM V46 SWITCH-OVER
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EXTEND # SCALED (B+3 ASCREV) 1/SECSQ
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MP IAVG/TLX # SCALED B+2 SECSQ
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DDOUBL
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DDOUBL
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TS VARK # SCALED (B+3 ASCREV)
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TC Q
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CSMN10 DEC .99999 # N10 CSM ONLY FILTER COEFFICIENTS
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DEC -.2549 # N11/2
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DEC .0588 # N12
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DEC -.7620 # D11/2
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DEC .7450 # D12
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DEC .99999 # N20
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DEC -.4852 # N21/2
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DEC 0 # N22
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DEC -.2692 # D22/2
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DEC 0 # D22
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LBN10 DEC +.99999 # N10 LOW BANDWIDTH FILTER COEFFICIENTS
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DEC -.3285 # N11/2
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DEC -.3301 #N12
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DEC -.9101 #D11/2
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DEC +.8460 #D12
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DEC +.03125 #N20
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DEC 0 #N21/2
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DEC 0 #N22
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DEC -.9101 #D21/2
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DEC +.8460 #D22
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DEC +.50000 #N30
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DEC -.47115 #N31/2
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DEC +.4749 #N32
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DEC -.9558 #D31/2
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DEC +.9372 #D32
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CSMCFADR GENADR CSMN10 # CSM ONLY COEFFICIENTS ADDRESS
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HBCFADR GENADR HBN10 # HIGH BANDWIDTH COEFFICIENTS ADDRESS
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# Page 944
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LBCFADR GENADR LBN10 # LOW BANDWIDTH COEFFICIENTS ADDRESS
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NZERO DEC 51 # MUST BE ODD FOR MRCLEAN
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NZEROJR DEC 23 # MUST BE ODD FOR MCLEANJR
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ATTLIM DEC 0.00833 # INITIAL ATTITUDE EROR LIMIT (1.5 DEG)
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1/ATTLIM DEC 0.007325 # .007325(ERROR) = 0 IF ERROR < 1.5 DEG
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TCORR OCT 00005 # CSM
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+1 OCT 00000 # CSM/LM (HB,LB)
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FKPRIMDT DEC .0102 # CSM/LM (LB), (.05 X .08) SCALED AT PI/8
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FREPFRAC DEC .0375 B-2 # CSM/LM (LB), 0.0375 SCALED AT B+2
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NINETEEN = VD1
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2PI/M DEC .00331017 B+8 # 2PI/M, SCALED AT 1/(B+8 N-M)
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ONETHOU DEC 1000 B-13 # KG/CS B3 TO KG/10SEC B16 CONVERSION
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EBANK= BZERO
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DAPINIT5 2CADR DAPINIT
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EBANK= BZERO
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INITLOC2 2CADR TVCINIT1
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