466 lines
14 KiB
Plaintext
466 lines
14 KiB
Plaintext
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# Copyright: Public domain.
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# Filename: R30.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: 712-722
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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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# 2009-06-07 RSB Removed a space between two components of
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# a 2OCT that isn't legal in yaYUL.
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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 712
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# SUBROUTINE NAME: V82CALL
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# MOD NO: 0 DATE: 16 FEB 67
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# MOD BY: R. R. BAIRNSFATHER LOG SECTION: R30
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# MOD NO: 1 MOD BY: R. R. BAIRNSFATHER DATE: 11 APR 67 SR30.1 CHANGED TO ALLOW MONITOR OPERN
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# MOD NO: 2 MOD BY: ALONSO DATE: 11 DEC 67 VB82 PROGRAM REWRITTEN
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# MOD NO: 3 MOD BY: ALONSO DATE: 26 MAR 68 PROG MOD TO HANDLE DIF EARTH/MOON SCALE
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#
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# NEW FUNCTIONAL DESCRIPTION: CALLED BY VERB 82 ENTER. PRIORITY 10.
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# USED THROUGHOUT. CALCULATE AND DISPLAY ORBITAL PARAMETERS
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#
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# 1. IF AVERAGE G IS OFF:
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# FLASH DISPLAY V04N06. R2 INDICATES WHICH SHIP'S STATE VECTOR IS
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# TO BE UPDATED. INITIAL CHOICE IS THIS SHIP (R2=1). ASTRONAUT
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# CAN CHANGE TO OTHER SHIP BY V22E XE. WHERE X IS NOT EQ 1.
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# SELECTED STATE VECTOR UPDATED BY THISPREC (OTHPREC).
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# CALLS SR30.1 (WHICH CALLS TFFCONMU + TFFRP/RA) TO CALCULATE
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# RPER (PERIGEE RADIUS), RAPO (APOGEE RADIUS), HPER (PERIGEE
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# HEIGHT ABOVE LAUNCH PAD OR LUNAR LANDING SITE), HARD (APOGEE
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# HEIGHT AS ABOVE), TPER (TIME TO PERIGEE), TFF (TIME TO
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# INTERSECT 300 KFT ABOVE PAD OR 35KFT ABOVE LANDING SITE).
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# FLASH MONITOR V16N44 (HAPO, HPER, TFF). TFF IS -59M59S IF IT WAS
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# NOT COMPUTABLE, OTHERWISE IT INCREMENTS ONCE PER SECOND.
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# ASTRONAUT HAS OPTION TO MONITOR TPER BY KEYING IN N 32 E.
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# DISPLAY IS IN HMS, IS NEGATIVE (AS WAS TFF), AND INCREMENTS
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# ONCE PER SECOND ONLY IF TFF DISPLAY WAS -59M59S.
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# 2. IF AVERAGE G IS ON:
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# CALLS SR30.1 APPROX EVERY TWO SECS. STATE VECTOR IS ALWAYS
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# FOR THIS VEHICLE. V82 DOES NOT DISTURB STATE VECTOR. RESULTS
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# OF SR30.1 ARE RAPO, RPER, HAPO, HPER, TPER, TFF.
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# FLASH MONITOR V16N44 (HAPO, HPER, TFF).
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# ADDENDUM: HAPO AND HPER SHOULD BE CHANGED TO READ HAPOX AND HPERX IN THE
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# ABOVE REMARKS.
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#
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# CALLING SEQUENCE: VERB 82 ENTER.
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#
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# SUBROUTINES CALLED: SR30.1, GOXDSPF
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# MAYBE -- THISPREC, OTHPREC, LOADTIME, DELRSPL
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#
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# NORMAL EXIT MODES: TC ENDEXT
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#
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# ALARMS: NONE
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#
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# OUTPUT: HAPOX (-29) M
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# HPERX (-29) M
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# RAPO (-29) M EARTH
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# (-27) M MOON
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# RPER (-29) M EARTH
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# (-27) M MOON
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# TFF (-28) CS CONTAINS NEGATIVE QUANTITY
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# -TPER (-28) CS CONTAINS NEGATIVE QUANTITY
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#
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# Page 713
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# ERASABLE INITIALIZATION REQUIRED: STATE VECTOR.
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#
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# DEBRIS: QPRET, RONE, VONE, TFF/RTMU, HPERMIN, RPADTEM, V82EMFLG.
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# MAYBE: TSTART82, V82FLAGS, TDEC1.
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EBANK= HAPOX
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BANK 31
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SETLOC R30LOC
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BANK
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COUNT* $$/R30
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V82CALL TC INTPRET
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BON GOTO
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AVEGFLAG
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V82GON # IF AVERAGE G ON
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V82GOFF # IF AVERAGE G OFF
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V82GOFF EXIT # ALLOW ASTRONAUT TO SELECT VEHICLE
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CAF TWO # DESIRED FOR ORBITAL PARAMETERS
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TS OPTIONX # CALCULATION AND DISPLAY.
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CAF ONE
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TS OPTIONX +1
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CAF OPTIONVN # V 04 N 06
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TC BANKCALL
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CADR GOXDSPF
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TC ENDEXT # TERMINATE
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TC +2 # PROCEED
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TC -5 # DATA IN. OPTION1+1 = 1 FOR THIS VEHICLE
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# UNEQ 1 FOR OTHER VEHICLE
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CAF BIT4 # 80 MS
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TC WAITLIST
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EBANK= TFF
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2CADR TICKTEST
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RELINT
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V82GOFLP CAF TFFBANK # MAJOR RECYCLE LOOP ENTRY
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TS EBANK
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CAF ZERO
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TS V82FLAGS # ZERO FLAGS FOR TICKTEST, INHIBITS
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# DECREMENTING OF TFF AND -TPER.
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CAF PRIO7
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TC FINDVAC # V82GOFF1 WILL EXECUTE STATE VECTOR
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EBANK= TFF # UPDATE AND ORBIT CALCULATIONS FOR
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2CADR V82GOFF1 # SELECTED VEHICLE ABOUT PROPER BODY.
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RELINT
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V82STALL CAF THREE # STALL IN THIS LOOP AND WITHOLD V 16 N 44
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# Page 714
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MASK V82FLAGS # UNTIL STATE VECTOR UPDATE SETS ONE OF
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CCS A # OUR FLAG BITS.
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TC FLAGGON # EXIT FROM STALL LOOP.
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CAF 1SEC
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TC BANKCALL
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CADR DELAYJOB
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TC V82STALL
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FLAGGON CAF V16N44 # MONITOR HAPO,HPER,TFF.
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TC BANKCALL
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CADR GOXDSPF
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TC B5OFF # TERM. THIS TELLS TICKTEST TO KILL ITSELF
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TC B5OFF # PROCEED. DITTO
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TC V82GOFLP # RECYCLE. RECOMPUTE STATE VECT + DISPLAY
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OPTIONVN VN 412
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V16N44 VN 1644
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TFFBANK ECADR TFF
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V82GOFF1 TC INTPRET
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RTB
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LOADTIME
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STORE TDEC1 # TIME FOR STATE VECTOR UPDATE.
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STORE TSTART82 # TIME FOR INTERNAL USE.
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EXIT
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CS OPTIONX +1 # 1 FOR THIS VEHICLE, NOT 1 FOR OTHER.
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AD ONE
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EXTEND
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BZF THISSHIP
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OTHSHIP TC INTPRET
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CALL # CALL STATE VECTOR UPDATE FOR OTHER SHIP.
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OTHPREC
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BOTHSHIP VLOAD # MOVE RESULTS INTO TFFCONIC STORAGE AREAS
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RATT # TO BE CALLED BY SR30.1.
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STOVL RONE # RATT AT (-29)M FOR EARTH OR MOON.
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VATT
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STORE VONE # VATT AT (-7)M/CS FOR EARTH OR MOON
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DLOAD*
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1/RTMUE,2 # X2 IS 0 FOR EARTH CENTERED STATE VEC
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STORE TFF/RTMU # X2 IS 2 FOR MOON
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DLOAD* # AS LEFT BY THISPREC OR OTHPREC.
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MINPERE,2
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STORE HPERMIN # TFFRTMU, HPERMIN, AND RPADTEM ARE ALL
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SLOAD BHIZ # EARTH/MOON PARAMETERS AS SET HERE.
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X2
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EARTHPAD
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GOTO
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MOONPAD
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# Page 715
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THISSHIP TC INTPRET
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CALL # CALL STATE VECTOR UPDATE FOR THIS SHIP.
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THISPREC
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GOTO
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BOTHSHIP
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# THE FOLLOWING CONSTANTS ARE PAIRWISE INDEXED. DO NOT SEPARATE PAIRS.
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MINPERM 2DEC 10668 B-27 # 35 KFT MIN PERIGEE HEIGHT FOR MOON(-27)M
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MINPERE 2DEC 91440 B-29 # 300 KFT (-29)M FOR EARTH
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EARTHPAD DLOAD CLRGO # PAD 37-B RADIUS. SCALED AT (-29)M
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RPAD
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V82EMFLG # INDICATE EARTH SCALING FOR SR30.1
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BOTHPAD
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MOONPAD VLOAD ABVAL # COMPUTE MOON PAD RADIUS FROM RLS VECTOR.
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RLS # SCALED AT (-27)M
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SET
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V82EMFLG # INDICATE MOON SCALILNG FOR SR30.1
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BOTHPAD STCALL RPADTEM
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SR30.1 # CALCULATE ORBITAL PARAMETERS
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RTB DSU
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LOADTIME
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TSTART82 # PRESENT TIME -- TIME V82GOFF1 BEGAN
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STORE TSTART82 # SAVE IT
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DLOAD BZE # SR30.1 SETS -TPER=0 IF HPER L/
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-TPER # HPERMIN (300 OR 35) KFT.
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TICKTIFF # (-TPER = 0)
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TICKTPER DLOAD DAD # (-TPER NON ZERO) TFF WAS NOT COMPUTED.
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-TPER # BUT WAS SET TO 59M59S. DON'T DICK TFF, DO
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TSTART82 # TICK -TPER. DISPLAY BOTH.
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STORE -TPER # -TPER CORRECTED FOR TIME SINCE V82GOFF1
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EXIT # BEGAN
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CAF BIT1
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TS V82FLAGS # INFORMS TICKTEST TO INCREMENT ONLY -TPER
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TC ENDOFJOB
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TICKTIFF DLOAD DAD # (-TPER=0) TFF WAS COMPUTED. TICK TFF.
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TFF # DO NOT TICK -TPER. DISPLAY TFF, BUT NOT
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TSTART82 # -TPER.
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STORE TFF # TFF CORRECTED FOR TIME SINCE V82GOFF1
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EXIT # BEGAN.
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CAF BIT2
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TS V82FLAGS # INFORMS TICKTEST TO INCREMENT ONLY TFF.
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TC ENDOFJOB
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# Page 716
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TICKTEST CAF BIT5 # THIS WAITLIST PROGRAM PERPETUATES ITSELF
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MASK EXTVBACT # ONCE A SEC UNTIL BIT 5 OF EXTVBACT =0.
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CCS A
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TC DOTICK
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CAF PRIO25
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TC NOVAC # TERMINATE V 82. CAN'T CALL ENDEXT IN RUPT.
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EBANK= EXTVBACT
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2CADR ENDEXT
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TC TASKOVER
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DOTICK CAF 1SEC # RE-REQUEST TICKTEST.
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TC WAITLIST
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EBANK= TFF
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2CADR TICKTEST
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CAF THREE
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MASK V82FLAGS
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INDEX A
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TC +1
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TC TASKOVER # IF NO FLAGBITS SET DONT' CHANGE TFF OR
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# -TPER, BUT CONTINUE LOOP.
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TC TPERTICK # ONLY BIT 1 SET. INCR -TPER BY 1 SEC.
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TFFTICK CAF 1SEC # ONLY BIT 2 SET. INCR TFF BY 1 SEC.
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TS L
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CAF ZERO
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DAS TFF
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TC TASKOVER
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TPERTICK CAF 1SEC
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TS L
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CAF ZERO
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DAS -TPER
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TC TASKOVER
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# Page 717
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V82GON EXIT # AVERAGE G ON. USE CURRENT STATE VECTOR
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# FOR ORBITAL PARAMETER CALCULATIONS.
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CAF PRIO7 # LESS THAN LAMBERT
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TC FINDVAC # V82GON1 WILL PERFORM ORBIT CALCULATIONS
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EBANK= TFF # ABOUT PROPER BODY APPROX ONCE PER SEC.
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2CADR V82GON1
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RELINT
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CCS NEWJOB # WITHOLD V16 N44 UNTIL FIRST ORBIT CALC
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TC CHANG1 # IS DONE. NOTE: V82GON1 (PRIO7, FINDVAC
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# JOB) IS COMPLETED BEFORE V82GON (PRIO7,
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# NOVAC JOB).
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V82REDSP CAF V16N44 # MONITOR HAPO, HPER, TFF
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TC BANKCALL
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CADR GOXDSPF
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TC B5OFF # TERM THIS TELLS V82GON1 TO KILL ITSELF.
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TC B5OFF # PROC DITTO.
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TC V82REDSP # RECYCLE
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V82GON1 TC INTPRET # THIS EXEC PROGRAM PERPETUATES ITSELF
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# ONCE A SEC UNTIL BIT 5 OF EXTVBACT =0.
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VLOAD GOTO # HOLDS OFF CCS NEWJOB BETWEEN RN AND
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RN # VN FETCH SO RN, VN ARE FROM SAME
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NEXTLINE # STATE VECTOR UPDATE.
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NEXTLINE STOVL RONE # RN AT (-29)M FOR EARTH OR MOON
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VN
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STORE VONE # VN AT (-7)M/CS FOR EARTH OR MOON
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BON GOTO
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MOONTHIS # FLAG INDICATES BODY ABOUT WHICH ORBITAL
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MOONGON # CALCULATIONS ARE TO BE PERFORMED.
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EARTHGON # IF SET -- MOON, IF RESET --EARTH.
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MOONGON SET DLOAD
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V82EMFLG # FLAG MOON SCALING FOR SR30.1
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1/RTMUM # LUNAR PARAMETERS LOADED HERE FOR SR30.1
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STODL TFF/RTMU
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MINPERM
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STOVL HPERMIN
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RLS # SCALED AT (-27)M
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ABVAL GOTO
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V82GON2
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EARTHGON CLEAR DLOAD
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V82EMFLG # INDICATE EARTH SCALING FOR SR30.1
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1/RTMUE # EARTH PARAMETERS LOADED HERE FOR SR30.1
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STODL TFF/RTMU
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MINPERE
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STODL HPERMIN
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RPAD
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V82GON2 STCALL RPADTEM # COMMON CODE FOR EARTH & MOON.
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SR30.1
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# Page 718
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EXIT
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V82GON3 CAF BIT5
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MASK EXTVBACT # SEE IF ASTRONAUT HAS SIGNALLED TERMINATE
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EXTEND
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BZF ENDEXT # YES, TERMINATE VB 82 LOOP
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CAF 1SEC
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TC BANKCALL # WAIT ONE SECOND BEFORE REPEATING
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CADR DELAYJOB # ORBITAL PARAMETER COMPUTATION.
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TC V82GON1
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SPLRET = V82GON3
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# Page 719
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# SUBROUTINE NAME: SR30.1
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# MOD NO: 0 DATE: 16 FEB 67
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# MOD BY: R. R. BAIRNSFATHER LOG SECTION: R32
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# MOD NO: 1 MOD BY: R. R. BAIRNSFATHER DATE: 11 APR 67 SR30.1 CHANGED TO ALLOW MONITOR OPERN
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# MOD NO: 2 MOD BY: R. R. BAIRNSFATHER DATE: 14 APR 67 ADD OVFL CK FOR RAPO
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# MOD NO: 3 MOD BY ALONSO DATE: 11 DEC 67 SUBROUTINE REWRITTEN
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# MOD NO: 4 MOD BY ALONSO DATE: 26 MAR 68 PROG MOD TO HANDLE DIF EARTH/MOON SCALE
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# MOD NO: 5 MOD BY: R. R. BAIRNSFATHER DATE: 6 AUG 68 OVFL CK FOR HAPO & HPER. VOIDS MOD #2.
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#
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# NEW FUNCTIONAL DESCRIPTION: ORBITAL PARAMETERS DISPLAY FOR NOUNS 32 AND 44.
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# SR30.1 CALLS TFFCONMU AND TFFRP/RA TO CALCULATE RPER (PERIGEE RADIUS),
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# RAPO (APOGEE RADIUS), HPER (PERIGEE HEIGHT ABOVE LAUNCH PAD OR LUNAR
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# LANDING SITE), HAPO (APOGEE HEIGHT AS ABOVE), TPER (TIME TO PERIGEE),
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# TFF (TIME TO INTERSECT 300 KFT ABOVE PAD OR 35KFT ABOVE LANDING SITE).
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# IF HPER IS GREATER THAN OR EQUAL TO HPERMIN, CALCULATES TPER AND STORES
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# NEGATIVE IN -TPER. OTHERWISE STORES +0 IN -TPER. WHENEVER TPER IS
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# CALCULATED, TFF IS NOT COMPUTABLE AND DEFAULTS TO -59MIN 59SEC. IF HAPO
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# WOULD EXCEED 9999.9 NM, IT IS LIMITED TO THAT VALUE FOR DISPLAY.
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#
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# ADDENDUM: HAPO AND HPER SHOULD BE CHANGED TO READ HAPOX AND HPERX IN THE
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# ABOVE REMARKS.
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#
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# CALLING SEQUENCE: CALL
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# SR30.1
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#
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# SUBROUTINES CALLED: TFFCONMU, TFFRP/RA, CALCTPER, CALCTFF
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#
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# NORMAL EXIT MODE: CALLING LINE +1 (STILL IN INTERPRETIVE MODE)
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#
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# ALARMS: NONE
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#
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# OUTPUT: RAPO (-29) M EARTH APOGEE RADIUS EARTH CENTERED COORD.
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# (-27) M MOON MOON CENTERED COORD.
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# RPER (-29) M EARTH PERIGEE RADIUS EARTH CENTERED COORD.
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# (-27) M MOON MOON CENTERED COORD.
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# HAPOX (-29) M APOGEE ALTITUDE ABOVE PAD OR LAND. SITE MAX VALUE LIMITED TO 9999.9 NM.
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# HPERX (-29) M PERIGEE ALT. ABOVE PAD OR LAND. SITE MAX VALUE LIMITED TO 9999.9 NM.
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# TFF (-28) CS TIME TO 300KFT OR 35KFT ALTITUDE
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# -TPER (-28) CS TIME TO PERIGEE
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#
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# ERASABLE INITIALIZATION REQUIRED --
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# TFF/RTMU (+17) EARTH RECIPROCAL OF PROPER GRAV CONSTANT FOR
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# (+14) MOON EARTH OR MOON = 1/SQRT(MU).
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# RONE (-29) M STATE VECTOR
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# VONE (-7) M/CS STATE VECTOR
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# RPADTEM (-29) M EARTH RADIUS OF LAUNCH PAD OR LUNAR LANDING
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# (-27) M MOON SITE.
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# HPERMIN (-29) M EARTH (300 OR 35) KFT MINIMUM PERIGEE ALTITUDE
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# (-27) M MOON ABOVE LAUNCH PAD OR LUNAR LANDING SITE.
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# V82EMFLG (INT SW BIT) RESET FOR EARTH, SET FOR MOON.
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#
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# DEBRIS: QPREG, PDL, S2
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# Page 720
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COUNT* $$/SR30S
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SR30.1 SETPD STQ # INITIALIZE PUSHDOWN LIST.
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0
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S2
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# SR30.1 INPUT: RONE AT (-29)M EARTH/MOON
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# VONE AT (-7)M/CS
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# TFFCONMU, TFFRP/RA, CALCTPER, AND CALCTFF
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# CALLS REQUIRE:
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# EARTH CENTERED (NO RESCALING REQUIRED)
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# RONE SCALED TO B-29 M
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# VONE SCALED TO B-7 M/CS
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# MOON CENTERED (RESCALING REQUIRED)
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# RONE SCALED TO B-27 M
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# VONE SCALED TO B-5 M/CS
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BOFF VLOAD
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V82EMFLG # OFF FOR EARTH, ON FOR MOON.
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TFFCALLS
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RONE
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VSL2
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STOVL RONE
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VONE
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VSL2
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STORE VONE
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TFFCALLS CALL
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TFFCONMU
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CALL # TFFRP/RA COMPUTES RAPO,RPER.
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TFFRP/RA
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# RETURNS WITH RAPO IN D(MPAC).
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DSU
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RPADTEM
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BOFF SR2R # NEED HAPO AT (-29)M FOR DISPLAY.
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# IF MOON CENTERED, RESCALE FROM (-27)M.
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# IF EARTH CENTERED ALREADY AT (-29)M.
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V82EMFLG # OFF FOR EARTH, ON FOR MOON.
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+1
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CALL # IF RAPO > MAXNM, SET RAPO =9999.9 NM.
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MAXCHK # OTHERWISE STORE (RAPO-RPADTEM) IN HAPO.
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STORHAPO STODL HAPOX
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RPER
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DSU
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RPADTEM # GIVES HPER AT (-29)M EARTH, (-27)M MOON.
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STORE MPAC +4 # SAVE THIS FOR COMPARISON TO HPERMIN.
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BOFF SR2R # NEED HPER AT (-29)M FOR DISPLAY.
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# IF MOON CENTERED, RESCALE FROM (-27)M.
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# IF EARTH CENTERED ALREADY AT (-29)M.
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V82EMFLG # OFF FOR EARTH, ON FOR MOON.
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+1
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CALL # IF HPER > MAXNM, SET HPER = 9999.9 NM.
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MAXCHK
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# Page 721
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STORHPER STODL HPERX # STORE (RPER - RPADTEM) INTO HPERX.
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MPAC +4
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DSU BPL # HPERMIN AT (-29)M FOR EARTH, (-27)M MOON
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HPERMIN # IF HPER L/ HPERMIN (300 OR 35) KFT,
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DOTPER # THEN ZERO INTO -TPER.
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DLOAD GOTO # OTHERWISE CALCULATE TPER.
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HI6ZEROS
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SKIPTPER
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DOTPER DLOAD CALL
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RPER
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CALCTPER
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DCOMP # TPER IS PUT NEG INTO -TPER.
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SKIPTPER STODL -TPER
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HPERMIN # HPERMIN AT (-29)M FOR EARTH, (-27)M MOON
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DAD CALL
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RPADTEM # RPADTEM AT (-29)M FOR EARTH, (-27)M MOON
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CALCTFF # GIVES 59M59S FOR TFF IF HPER G/
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DCOMP # HPERMIN + RPADTEM. (TPER WAS NON ZERO)
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STCALL TFF # OTHERWISE COMPUTES TFF. (GOTO)
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S2
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MAXCHK DSU BPL # IF C(MPAC) > 9999.9 NM. MPAC = 9999.9 NM.
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MAXNM
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+3 # OTHERWISE C(MPAC) - B(MPAC).
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DAD RVQ
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MAXNM
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+3 DLOAD RVQ # (USED BY P30 -- P37 ALSO)
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MAXNM
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MAXNM 2OCT 0106505603
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# Page 722 (empty page)
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