206 lines
4.7 KiB
Plaintext
206 lines
4.7 KiB
Plaintext
# Copyright: Public domain.
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# Filename: GROUND_TRACKING_DETERMINATION_PROGRAM.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: 654-657
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# Mod history: 2009-05-18 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 654
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# GROUND TRACKING DETERMINATION PROGRAM -- P21
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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 2.137535898 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 655
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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* $$/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 GOTOPOOH # 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 GOTOPOOH # 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 CLEAR
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P21FLAG
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P21CONT # ON -- RECYCLE USING BASE VECTOR
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VINTFLAG # OFF -- 1ST PASS CALL BASE VECTOR
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SLOAD SR1
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OPTION2
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BHIZ SET
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+2 # ZERO -- THIS VEHICLE (LM)
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VINTFLAG # ONE -- OTHER VEHICLE (CM)
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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
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P21BASER # RECYCLE -- INTEG FROM BASE VECTOR
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STOVL RCV # --POS
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# Page 656
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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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+3 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-07 OR B-05
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ABVAL SL*
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0,2
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STOVL P21VEL # VEL/ FOR N91 DISP
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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 SLOAD
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P21ORIG # 0 = EARTH
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OPTION2
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SR1 BHIZ
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+3
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GOTO
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+4
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+3 BON
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SURFFLAG
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P21DSP
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+4 SET
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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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# Page 657
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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 N91 DISP
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EXIT
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CAF V06N43 # DISPLAY LAT, LONG, ALT
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TC BANKCALL # LAT, LONG = 1/2 REVS B0
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CADR GOFLASH # ALT = KM B14
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TC GOTOPOOH # TERM
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TC GOTOPOOH
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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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V06N43 VN 00643
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V6N34 VN 00634
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K.01 2DEC .01
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