268 lines
4.9 KiB
Plaintext
268 lines
4.9 KiB
Plaintext
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# Copyright: Public domain.
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# Filename: R31.agc
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# Purpose: Part of the source code for Luminary 1A build 099.
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# It is part of the source code for the Lunar Module's (LM)
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# Apollo Guidance Computer (AGC), for Apollo 11.
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# Assembler: yaYUL
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# Contact: Ron Burkey <info@sandroid.org>.
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# Website: www.ibiblio.org/apollo.
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# Pages: 703-708
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# Mod history: 2009-05-19 RSB Adapted from the corresponding
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# Luminary131 file, using page
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# images from Luminary 1A.
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#
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# This source code has been transcribed or otherwise adapted from
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# digitized images of a hardcopy from the MIT Museum. The digitization
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# was performed by Paul Fjeld, and arranged for by Deborah Douglas of
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# the Museum. Many thanks to both. The images (with suitable reduction
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# in storage size and consequent reduction in image quality as well) are
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# available online at www.ibiblio.org/apollo. If for some reason you
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# find that the images are illegible, contact me at info@sandroid.org
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# about getting access to the (much) higher-quality images which Paul
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# 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 001 of AGC program LMY99 by NASA 2021112-61
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# 16:27 JULY 14, 1969
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# Page 703
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BANK 40
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SETLOC R31LOC
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BANK
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COUNT* $$/R31
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R31CALL CAF PRIO3
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TC FINDVAC
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EBANK= SUBEXIT
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2CADR V83CALL
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DSPDELAY TC FIXDELAY
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DEC 100
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CA EXTVBACT
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MASK BIT12
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EXTEND
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BZF DSPDELAY
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CAF PRIO5
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TC NOVAC
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EBANK= TSTRT
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2CADR DISPN5X
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TCF TASKOVER
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BANK 37
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SETLOC R31
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BANK
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COUNT* $$/R31
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DISPN5X CAF V16N54
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TC BANKCALL
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CADR GOMARKF
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TC B5OFF
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TC B5OFF
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TCF DISPN5X
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V83CALL CS FLAGWRD7 # TEST AVERAGE G FLAG
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MASK AVEGFBIT
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EXTEND
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BZF MUNG? # ON. TEST MUNFLAG
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CS FLAGWRD8
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MASK SURFFBIT
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EXTEND
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BZF ONEBASE # ON SURFACE -- BYPASS LEMPREC
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TC INTPRET # EXTRAPOLATE BOTH STATE VECTORS
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RTB
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# Page 704
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LOADTIME
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STCALL TDEC1
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LEMPREC # PRECISION BASE VECTOR FOR LM
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VLOAD
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RATT1
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STOVL BASETHP
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VATT1
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STODL BASETHV
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TAT
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DOCMBASE STORE BASETIME # PRECISION BASE VECTOR FOR CM
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STCALL TDEC1
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CSMPREC
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VLOAD
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RATT1
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STOVL BASEOTP
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VATT1
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STORE BASEOTV
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EXIT
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REV83 CS FLAGWRD7
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MASK AVEGFBIT
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EXTEND
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BZF GETRVN # IF AVEGFLAG SET, USE RN,VN
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CS FLAGWRD8
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MASK SURFFBIT
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EXTEND
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BZF R31SURF # IF ON SURFACE, USE LEMAREC
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TC INTPRET # DO CONIC EXTRAPOLATION FOR BOTH VEHICLES
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RTB
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LOADTIME
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STCALL TDEC1
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INTSTALL
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VLOAD CLEAR
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BASETHP
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MOONFLAG
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STOVL RCV
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BASETHV
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STODL VCV
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BASETIME
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BOF SET # GET APPROPRIATE MOONFLAG SETTING
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MOONTHIS
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+2
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MOONFLAG
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SET
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INTYPFLG # CONIC EXTRAP.
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STCALL TET
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INTEGRVS # INTEGRATION --- AT LAST ---
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OTHCONIC VLOAD
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# Page 705
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RATT
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STOVL RONE
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VATT
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STCALL VONE # GET SET FOR CONIC EXTRAP., OTHER.
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INTSTALL
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SET DLOAD
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INTYPFLG
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TAT
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OTHINT STORE TDEC1
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VLOAD CLEAR
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BASEOTP
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MOONFLAG
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STOVL RCV
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BASEOTV
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STODL VCV
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BASETIME
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BOF SET
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MOONTHIS
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+2
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MOONFLAG
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STCALL TET
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INTEGRVS
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COMPDISP VLOAD VSU
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RATT
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RONE
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RTB PDDL
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NORMUNX1 # UNIT(RANGE) TO PD 0-5
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36D
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SL* # RESCALE AFTER NORMUNIT
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0,1
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STOVL RANGE # SCALED 2(29)M
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VATT
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VSU DOT # (VCM-VLM).UNIT(LOS), PD=0
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VONE
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SL1 # SCALED 2(7)M/CS
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STOVL RRATE
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RONE
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UNIT PDVL # UNIT(R) TO PD 0-5
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UNITZ
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CALL
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CDU*NBSM
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VXM PUSH # UNIT(Z)/4 TO PD 6-11
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REFSMMAT
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VPROJ VSL2 # UNIT(P)=UNIT(UZ-(UZ)PROJ(UR))
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0D
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BVSU UNIT
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6D
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PDVL VXV # UNIT(P) TO PD 12-17
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0D # UNIT(RL)
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VONE
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# Page 706
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VXV DOT # (UR * VL) * UR . U(P)
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0D
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12D
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PDVL # SIGN TO 12-13, LOAD U(P)
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DOT SIGN
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6D
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12D
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SL2 ACOS # ARCCOS(UP.UZ(SIGN))
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STOVL RTHETA
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0D
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DOT BPL # IF UR.UZ NEG,
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6D # RTHETA = 1 - RTHETA
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+5
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DLOAD DSU
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DPPOSMAX
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RTHETA
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STORE RTHETA
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EXIT
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CA BIT5
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MASK EXTVBACT
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EXTEND # IF ANSWERED,
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BZF ENDEXT # TERMINATE
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CS EXTVBACT
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MASK BIT12
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ADS EXTVBACT # SET BIT 12
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TCF REV83 # AND START AGAIN.
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GETRVN CA PRIO22 # INHIBIT SERVICER
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TC PRIOCHNG
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TC INTPRET
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VLOAD SETPD
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RN # LM STATE VECTOR IN RN,VN.
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0
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STOVL RONE
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VN
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STOVL VONE # LOAD R(CSM),V(CSM) IN CASE MUNFLAG SET
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V(CSM) # (TO INSURE TIME COMPATIBILITY)
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PDVL PDDL
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R(CSM)
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PIPTIME
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EXIT
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CA PRIO3
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TC PRIOCHNG
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TC INTPRET
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BOFF VLOAD
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MUNFLAG
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GETRVN2 # IF MUNFLAG RESET, DO CM DELTA PRECISION
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# Page 707
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VXM VSR4 # CHANGE TO REFERENCE SYSTEM AND RESCALE
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REFSMMAT
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PDVL # R TO PD 0-5
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VXM VSL1
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REFSMMAT
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PUSH SETPD # V TO PD 5-11
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0
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GOTO
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COMPDISP
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GETRVN2 CALL
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INTSTALL
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CLEAR GOTO
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INTYPFLG # PREC EXTRAP FOR OTHER
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OTHINT
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R31SURF TC INTPRET
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RTB # LM IS ON SURFACE, SO PRECISION
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LOADTIME # INTEGRATION USED PLANETARY INERTIAL
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STCALL TDEC1 # ORIENTATION SUBROUTINE
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LEMPREC
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GOTO # DO CSM CONIC
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OTHCONIC
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MUNG? CS FLAGWRD6
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MASK MUNFLBIT
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EXTEND
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BZF GETRVN # IF MUNFLAG SET, CSM BASE NOT NEEDED
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ONEBASE TC INTPRET # GET CSM BASE VECTOR
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RTB GOTO
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LOADTIME
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DOCMBASE
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V16N54 VN 1654
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# Page 708 (empty page)
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