2016-07-07 08:47:26 +00:00
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# Copyright: Public domain.
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# Filename: GROUND_TRACKING_DETERMINATION_PROGRAM.agc
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# Purpose: Part of the source code for Comanche, build 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), Apollo 11.
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# Assembler: yaYUL
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# Reference: pp. 456-459
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# Contact: Onno Hommes <ohommes@cmu.edu>.
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# Website: www.ibiblio.org/apollo.
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# Mod history: 2009-05-07 OH Transcription Batch 1 Assignment
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# 2009-05-20 RSB Corrected a couple of DIMOFLAG to DIM0FLAG.
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#
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# The contents of the "Comanche055" files, in general, are transcribed
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# from scanned documents.
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#
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# Assemble revision 055 of AGC program Comanche by NASA
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# 2021113-051. April 1, 1969.
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#
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# This AGC program shall also be referred to as Colossus 2A
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#
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# Prepared by
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2016-07-11 19:55:52 +00:00
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# Massachusetts Institute of Technology
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2016-07-07 08:47:26 +00:00
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# 75 Cambridge Parkway
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# Cambridge, Massachusetts
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#
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# under NASA contract NAS 9-4065.
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#
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# Refer directly to the online document mentioned above for further information.
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# Please report any errors to info@sandroid.org.
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# Page 456
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# GROUND TRACKING DETERMINATION PROGRAM -- P21
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#
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# PROGRAM DESCRIPTION
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# MOD NO -- 1
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# MOD BY -- N. M. NEVILLE
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#
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# FUNCTIONAL DESCRIPTION --
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# TO PROVIDE THE ASTRONAUT DETAILS OF THE LM OR CSM GROUND TRACK WITHOUT
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# THE NEED FOR GROUND COMMUNICATION (REQUESTED BY DSKY).
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#
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# CALLING SEQUENCE --
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# ASTRONAUT REQUEST THROUGH DSKY V37E21E
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#
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# SUBROUTINES CALLED --
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# GOPERF4
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# GOFLASH
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# THISPREC
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# OTHPREC
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# LAT-LONG
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#
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# NORMAL EXIT MODES --
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# ASTRONAUT REQUEST THROUGH DSKY TO TERMINATE PROGRAM V34E
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#
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# ALARM OR ABORT EXIT MODES --
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# NONE
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#
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# OUTPUT --
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# OCTAL DISPLAY OF OPTION CODE AND VEHICLE WHOSE GROUND TRACK IS TO BE
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# COMPUTED
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# OPTION CODE 00002
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# THIS 00001
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# OTHER 00002
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# DECIMAL DISPLAY OF TIME TO BE INTEGRATED TO HOURS , MINUTES , SECONDS
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# DECIMAL DISPLAY OF LAT,LONG,ALT
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#
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# ERASABLE INITIALIZATION REQUIRED
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# AX0 2DEC 4.652459653 E-5 RADIANS "68-69 CONSTANTS"
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# -AY0 2DEC 2.147535898 E-5 RADIANS
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# AZ0 2DEC .7753206164 REVOLUTIONS
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# FOR LUNAR ORBITS 504LM VECTOR IS NEEDED
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# 504LM 2DEC -2.700340600 E-5 RADIANS
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# 504LM _2 2DEC -7.514128400 E-4 RADIANS
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# 504LM _4 2DEC _2.553198641 E-4 RADIANS
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#
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# NONE
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#
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# DEBRIS
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# Page 457
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# CENTRALS -- A,Q,L
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# OTHER -- THOSE USED BY THE ABOVE LISTED SUBROUTINES
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# SEE LEMPREC, LAT-LONG
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SBANK= LOWSUPER # FOR LOW 2CADR'S.
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BANK 33
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SETLOC P20S
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BANK
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EBANK= P21TIME
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COUNT 24/P21
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PROG21 CAF ONE
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TS OPTION2 # ASSUMED VEHICLE IS LM, R2 = 00001
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CAF BIT2 # OPTION 2
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TC BANKCALL
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CADR GOPERF4
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TC GOTOP00H # TERMINATE
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TC +2 # PROCEED VALUE OF ASSUMED VEHICLE OK
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TC -5 # R2 LOADED THROUGH DSKY
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P21PROG1 CAF V6N34 # LOAD DESIRED TIME OF LAT-LONG.
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TC BANKCALL
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CADR GOFLASH
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TC GOTOP00H # TERM
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TC +2 # PROCEED VALUES OK
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TC -5 # TIME LOADED THROUGH DSKY
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TC INTPRET
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DLOAD
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DSPTEM1
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STCALL TDEC1 # INTEG TO TIME SPECIFIED IN TDEC
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INTSTALL
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BON SET
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P21FLAG
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P21CONT # ON...RECYCLE USING BASE VECTOR
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VINTFLAG # OFF..1ST PASS CALC BASE VECTOR
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SLOAD SR1
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OPTION2
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BHIZ CLEAR
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+2 # ZERO..THIS VEHICLE (CM)
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VINTFLAG # ONE...OTHER VEHICLE(LM)
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CLEAR CLEAR
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DIM0FLAG
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INTYPFLG # PRECISION
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CALL
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INTEGRV # CALCULATE
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GOTO # .AND
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P21VSAVE # ..SAVE BASE VECTOR
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P21CONT VLOAD # RECYCLE..INTEG FROM BASE VECTOR
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P21BASER
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# Page 458
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STOVL RCV # ..POS
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P21BASEV
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STODL VCV # ..VEL
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P21TIME
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STORE TET # ..TIME
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CLEAR CLEAR
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DIM0FLAG
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MOONFLAG
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SLOAD BZE
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P21ORIG
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+3 # ZERO = EARTH
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SET # ...2 = MOON
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MOONFLAG
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CALL
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INTEGRVS
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P21VSAVE DLOAD # SAVE CURRENT BASE VECTOR
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TAT
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STOVL P21TIME # ..TIME
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RATT1
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STOVL P21BASER # ..POS B-29 OR B-27
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VATT1
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STORE P21BASEV # ..VEL B-7 OR B-5
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ABVAL SL*
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0,2
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STOVL P21VEL # /VEL/ FOR N73 DSP
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RATT
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UNIT DOT
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VATT # U(R).(V)
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DDV ASIN # U(R).U(V)
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P21VEL
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STORE P21GAM # SIN-1 U(R).U(V), -90 TO +90
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SXA,2 SET
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P21ORIG # 0 = EARTH 2 = MOON
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P21FLAG
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P21DSP CLEAR SLOAD # GENERATE DISPLAY DATA
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LUNAFLAG
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X2
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BZE SET
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+2 # 0 = EARTH
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LUNAFLAG
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VLOAD
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RATT
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STODL ALPHAV
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TAT
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CLEAR CALL
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ERADFLAG
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LAT-LONG
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DMP # MPAC = ALT, METERS B-29
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K.01
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STORE P21ALT # ALT/100 FOR N73 DSP
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# Page 459
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EXIT
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CAF V06N43 # DISPLAY LAT,LONG,ALT
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TC BANKCALL # LAT,LONG = REVS B0 BOTH EARTH/MOON
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CADR GOFLASH # ALT = METERS B-29 BOTH EARTH/MOON
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TC GOTOP00H # TERM
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TC GOTOP00H
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TC INTPRET # V32E RECYCLE
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DLOAD DAD
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P21TIME
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600SEC # 600 SECONDS OR 10 MIN
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STORE DSPTEM1
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RTB
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P21PROG1
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600SEC 2DEC 60000 # 10 MIN
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P21ONENN OCT 00001 # NEEDED TO DETERMINE VEHICLE
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OCT 00000 # TO BE INTEGRATED
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V06N43 VN 00643
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V6N34 VN 00634
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K.01 2DEC .01
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