Source Code
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These source-code files are part of a reconstructed copy of LUM69 Revision 2, the
flown Apollo 10 Lunar Module (LM) Apollo Guidance Computer (AGC) software.
The reconstruction began with source code of Luminary 69 revision 0 previously
transcribed from a digitized copy of that program. The code was then updated
by back-porting the R-2 lunar potential model from previously-transcribed source
code of Luminary 99. These required changes were described in the original
Luminary memos 75 and 78. The reconstructed code was verified by
matching memory-bank checksums to those listed in drawing 2021152G. Note that
page numbers in the reconstructed code match those on the Luminary 069 printout,
although the added code would likely have changed page numbers for a real LUM69
Revision 2 listing.
Comments from the original source code are prefixed with a single '#' symbol,
whereas comments added later are prefixed by "##" or "###". Report any errors
noted by creating an
issue report at the Virtual AGC
project's GitHub repository.
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031144,000002: ## Copyright: Public domain.
031145,000003: ## Filename: R30.agc
031146,000004: ## Purpose: A section of LUM69 revision 2.
031147,000005: ## It is part of the reconstructed source code for the flown
031148,000006: ## version of the flight software for the Lunar Module's (LM)
031149,000007: ## Apollo Guidance Computer (AGC) for Apollo 10. The code has
031150,000008: ## been recreated from a copy of Luminary revsion 069, using
031151,000009: ## changes present in Luminary 099 which were described in
031152,000010: ## Luminary memos 75 and 78. The code has been adapted such
031153,000011: ## that the resulting bugger words exactly match those specified
031154,000012: ## for LUM69 revision 2 in NASA drawing 2021152B, which gives
031155,000013: ## relatively high confidence that the reconstruction is correct.
031156,000014: ## Reference: pp. 720-730
031157,000015: ## Assembler: yaYUL
031158,000016: ## Contact: Ron Burkey <info@sandroid.org>.
031159,000017: ## Website: www.ibiblio.org/apollo/index.html
031160,000018: ## Mod history: 2019-07-27 MAS Created from Luminary 69.
031161,000019:
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Page 720
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031163,000021: # SUBROUTINE NAME: V82CALL
031164,000022: # MOD NO: 0 DATE: 16 FEB 67
031165,000023: # MOD BY: RR BAIRNSFATHER LOG SECTION: R30
031166,000024: # MOD NO: 1 MOD BY: RR BAIRNSFATHER DATE: 11 APR 67 SR30.1 CHANGED TO ALLOW MONITOR OPERN
031167,000025: # MOD NO: 2 MOD BY ALONSO DATE: 11 DEC 67 VB82 PROGRAM REWRITTEN
031168,000026: # MOD NO: 3 MOD BY ALONSO DATE: 26 MAR 68 PROG MOD TO HANDLE DIF EARTH/MOON SCALE
031169,000027:
031170,000028: # NEW FUNCTIONAL DESCRIPTION: CALLED BY VERB 82 ENTER. PRIORITY 10
031171,000029: # USED THROUGHOUT. CALCULATE AND DISPLAY ORBITAL PARAMETERS
031172,000030:
031173,000031: # 1. IF AVERAGE G IS OFF:
031174,000032: # FLASH DISPLAY V04N06. R2 INDICATES WHICH SHIP'S STATE VECTOR IS
031175,000033: # TO BE UPDATED. INITIAL CHOICE IS THIS SHIP (R2=1). ASTRONAUT
031176,000034: # CAN CHANGE TO OTHER SHIP BY V22EXE, WHERE X NOT EQ 1.
031177,000035: # SELECTED STATE VECTOR UPDATED BY THISPREC (OTHPREC).
031178,000036: # CALLS SR30.1 (WHICH CALLS TFFCONMU + TFFRP/RA) TO CALCULATE
031179,000037: # RPER (PERIGEE RADIUS), RAPO (APOGEE RADIUS), HPER (PERIGEE
031180,000038: # HEIGHT ABOVE LAUNCH PAD OR LUNAR LANDING SITE), HAPO (APOGEE
031181,000039: # HEIGHT AS ABOVE), TPER (TIME TO PERIGEE), TFF (TIME TO
031182,000040: # INTERSECT 300 KFT ABOVE PAD OR 35KFT ABOVE LANDING SITE).
031183,000041: # FLASH MONITOR V16N44 (HAPO, HPER, TFF). TFF IS -59M59S IF IT WAS
031184,000042: # NOT COMPUTABLE, OTHERWISE IT INCREMENTS ONCE PER SECOND.
031185,000043: # ASTRONAUT HAS OPTION TO MONITOR TPER BY KEYING IN N 32 E.
031186,000044: # DISPLAY IS IN HMS, IS NEGATIVE (AS WAS TFF), AND INCREMENTS
031187,000045: # ONCE PER SECOND ONLY IF TFF DISPLAY WAS -59M59S.
031188,000046: # 2. IF AVERAGE G IS ON:
031189,000047: # CALLS SR30.1 APPROX EVERY TWO SECS. STATE VECTOR IS ALWAYS
031190,000048: # FOR THIS VEHICLE. V82 DOES NOT DISTURB STATE VECTOR. RESULTS
031191,000049: # OF SR30.1 ARE RAPO, RPER, HAPO, HPER, TPER, TFF.
031192,000050: # FLASH MONITOR V16N44 (HAPO, HPER, TFF).
031193,000051: # ADDENDUM: HAPO AND HPER SHOULD BE CHANGED TO READ HAPOX AND HPERX IN THE
031194,000052: # ABOVE REMARKS.
031195,000053:
031196,000054: # CALLING SEQUENCE: VERB 82 ENTER.
031197,000055:
031198,000056: # SUBROUTINES CALLED: SR30.1, GOXDSPF
031199,000057: # MAYBE - THISPREC, OTHPREC, LOADTIME, DELRSPL
031200,000058:
031201,000059: # NORMAL EXIT MODES: TC ENDEXT
031202,000060:
031203,000061: # ALARMS: NONE
031204,000062:
031205,000063: # OUTPUT: HAPOX (-29) M
031206,000064: # HPERX (-29) M
031207,000065: # RAPO (-29) M EARTH
031208,000066: # (-27) M MOON
031209,000067: # RPER (-29) M EARTH
031210,000068: # (-27) M MOON
031211,000069: # TFF (-28) CS CONTAINS NEGATIVE QUANTITY
031212,000070: # -TPER (-28) CS CONTAINS NEGATIVE QUANTITY
031213,000071:
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Page 721
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031215,000073: # ERASABLE INITIALIZATION REQUIRED: STATE VECTOR.
031216,000074:
031217,000075: # DEBRIS: QPRET, RONE, VONE, TFF/RTMU, HPERMIN, RPADTEM, V82EMFLG.
031218,000076: # MAYBE: TSTART82, V82FLAGS, TDEC1.
031219,000077:
031220,000078: 13,2351 E4,1517 EBANK= HAPOX
031221,000079: 31,2172 BANK 31
031222,000080: 22,2000 SETLOC R30LOC
031223,000081: 22,2000 BANK
031224,000082: 22,3242 COUNT* $$/R30
031225,000083:
031226,000084: 22,3242 06036 V82CALL TC INTPRET
031227,000085: 22,3243 52014 BON GOTO
031228,000086: 22,3244 03712 AVEGFLAG
031229,000087: 22,3245 45465 V82GON # IF AVERAGE G ON
031230,000088: 22,3246 45247 V82GOFF # IF AVERAGE G OFF
031231,000089:
031232,000090: 22,3247 77776 V82GOFF EXIT # ALLOW ASTRONAUT TO SELECT VEHICLE
031233,000091: 22,3250 34752 CAF TWO # DESIRED FOR ORBITAL PARAMETERS
031234,000092: 22,3251 55051 TS OPTIONX # CALCULATION AND DISPLAY.
031235,000093: 22,3252 34753 CAF ONE
031236,000094: 22,3253 55052 TS OPTIONX +1
031237,000095: 22,3254 33316 CAF OPTIONVN # V 04 N 06
031238,000096: 22,3255 04616 TC BANKCALL
031239,000097: 22,3256 20212 CADR GOXDSPF
031240,000098: 22,3257 05472 TC ENDEXT # TERMINATE
031241,000099: 22,3260 03262 TC +2 # PROCEED
031242,000100: 22,3261 03254 TC -5 # DATA IN. OPTION1+1 = 1 FOR THIS VEHICLE.
031243,000101: # UNEQ 1 FOR OTHER VEHICLE.
031244,000102: 22,3262 34750 CAF BIT4 # 80 MS
031245,000103: 22,3263 05203 TC WAITLIST
031246,000104: 22,3264 E4,1540 EBANK= TFF
031247,000105: 22,3264 03430 44064 2CADR TICKTEST
031248,000106:
031249,000107: 22,3266 00003 RELINT
031250,000108: 22,3267 33320 V82GOFLP CAF TFFBANK # MAJOR RECYCLE LOOP ENTRY
031251,000109: 22,3270 54003 TS EBANK
031252,000110: 22,3271 34755 CAF ZERO
031253,000111: 22,3272 55537 TS V82FLAGS # ZERO FLAGS FOR TICKTEST. INHIBITS
031254,000112: # DECREMENTING OF TFF AND -TPER.
031255,000113: 22,3273 35021 CAF PRIO7
031256,000114: 22,3274 05105 TC FINDVAC # V82GOFF1 WILL EXECUTE STATE VECTOR
031257,000115: 22,3275 E4,1540 EBANK= TFF # UPDATE AND ORBIT CALCULATIONS FOR
031258,000116: 22,3275 03321 44064 2CADR V82GOFF1 # SELECTED VEHICLE ABOUT PROPER BODY.
031259,000117:
031260,000118: 22,3277 00003 RELINT
031261,000119: 22,3300 36244 V82STALL CAF THREE # STALL IN THIS LOOP AND WITHOLD V 16 N 44
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Page 722
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031263,000121: 22,3301 71537 MASK V82FLAGS # UNTIL STATE VECTOR UPDATE SETS ONE OF
031264,000122: 22,3302 10000 CCS A # OUR FLAG BITS.
031265,000123: 22,3303 03310 TC FLAGGON # EXIT FROM STALL LOOP.
031266,000124: 22,3304 34777 CAF 1SEC
031267,000125: 22,3305 04616 TC BANKCALL
031268,000126: 22,3306 01735 CADR DELAYJOB
031269,000127: 22,3307 03300 TC V82STALL
031270,000128:
031271,000129: 22,3310 33317 FLAGGON CAF V16N44 # MONITOR HAPO,HPER,TFF.
031272,000130: 22,3311 04616 TC BANKCALL
031273,000131: 22,3312 20212 CADR GOXDSPF
031274,000132: 22,3313 05563 TC B5OFF # TERM THIS TELLS TICKTEST TO KILL ITSELF
031275,000133: 22,3314 05563 TC B5OFF # PROCEED DITTO
031276,000134: 22,3315 03267 TC V82GOFLP # RECYCLE RECOMPUTE STATE VECT + DISPLAY
031277,000135:
031278,000136: 22,3316 01014 OPTIONVN VN 412
031279,000137: 22,3317 04054 V16N44 VN 1644
031280,000138: 22,3320 02140 TFFBANK ECADR TFF
031281,000139:
031282,000140: 22,3321 06036 V82GOFF1 TC INTPRET
031283,000141: 22,3322 77634 RTB
031284,000142: 22,3323 21462 LOADTIME
031285,000143: 22,3324 00041 STORE TDEC1 # TIME FOR STATE VECTOR UPDATE.
031286,000144: 22,3325 02211 STORE TSTART82 # TIME FOR INTERNAL USE.
031287,000145: 22,3326 77776 EXIT
031288,000146: 22,3327 41052 CS OPTIONX +1 # 1 FOR THIS VEHICLE, NOT 1 FOR OTHER.
031289,000147: 22,3330 64753 AD ONE
031290,000148: 22,3331 00006 EXTEND
031291,000149: 22,3332 13356 BZF THISSHIP
031292,000150: 22,3333 06036 OTHSHIP TC INTPRET
031293,000151: 22,3334 77624 CALL # CALL STATE VECTOR UPDATE FOR OTHER SHIP.
031294,000152: 22,3335 27043 OTHPREC
031295,000153: 22,3336 77775 BOTHSHIP VLOAD # MOVE RESULTS INTO TFFCONIC STORAGE AREAS
031296,000154: 22,3337 00001 RATT # TO BE CALLED BY SR30.1.
031297,000155: 22,3340 26213 STOVL RONE # RATT AT (-29)M FOR EARTH OR MOON
031298,000156: 22,3341 00007 VATT
031299,000157: 22,3342 02221 STORE VONE # VATT AT (-7)M/CS FOR EARTH OR MOON
031300,000158: 22,3343 77743 DLOAD*
031301,000159: 22,3344 73774 1/RTMUE,2 # X2 IS 0 FOR EARTH CENTERED STATE VEC
031302,000160: 22,3345 00037 STORE TFF/RTMU # X2 IS 2 FOR MOON
031303,000161: 22,3346 77743 DLOAD* # AS LEFT BY THISPREC OR OTHPREC.
031304,000162: 22,3347 72411 MINPERE,2
031305,000163: 22,3350 02205 STORE HPERMIN # TFFRTMU, HPERMIN AND RPADTEM ARE ALL
031306,000164: 22,3351 46135 SLOAD BHIZ # EARTH/MOON PARAMETERS AS SET HERE.
031307,000165: 22,3352 00050 X2
031308,000166: 22,3353 45367 EARTHPAD
031309,000167: 22,3354 77650 GOTO
031310,000168: 22,3355 45373 MOONPAD
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Page 723
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031312,000170: 22,3356 06036 THISSHIP TC INTPRET
031313,000171: 22,3357 77624 CALL # CALL STATE VECTOR UPDATE FOR THIS SHIP.
031314,000172: 22,3360 27057 THISPREC
031315,000173: 22,3361 77650 GOTO
031316,000174: 22,3362 45336 BOTHSHIP
031317,000175:
031318,000176: # THE FOLLOWING CONSTANTS ARE PAIRWISE INDEXED. DO NOT SEPARATE PAIRS.
031319,000177:
031320,000178: 22,3363 00001 11530 MINPERM 2DEC 10668 B-27 # 35 KFT MIN PERIGEE HEIGHT FOR MOON(-27)M
031321,000179:
031322,000180: 22,3365 00002 31230 MINPERE 2DEC 91440 B-29 # 300 KFT (-29)M FOR EARTH
031323,000181:
031324,000182: 22,3367 43145 EARTHPAD DLOAD CLRGO # PAD 37-B RADIUS. SCALED AT (-29)M.
031325,000183: 22,3370 06276 RPAD
031326,000184: 22,3371 03635 V82EMFLG # INDICATE EARTH SCALING FOR SR30.1
031327,000185: 22,3372 45377 BOTHPAD
031328,000186:
031329,000187: 22,3373 51575 MOONPAD VLOAD ABVAL # COMPUTE MOON PAD RADIUS FROM RLS VECTOR.
031330,000188: 22,3374 02023 RLS # SCALED AT (-27)M.
031331,000189: 22,3375 77614 SET
031332,000190: 22,3376 03475 V82EMFLG # INDICATE MOON SCALING FOR SR30.1
031333,000191: 22,3377 36207 BOTHPAD STCALL RPADTEM
031334,000192: 22,3400 45551 SR30.1 # CALCULATE ORBITAL PARAMETERS
031335,000193: 22,3401 45234 RTB DSU
031336,000194: 22,3402 21462 LOADTIME
031337,000195: 22,3403 02211 TSTART82 # PRESENT TIME - TIME V82GOFF1 BEGAN
031338,000196: 22,3404 02211 STORE TSTART82 # SAVE IT
031339,000197: 22,3405 53145 DLOAD BZE # SR30.1 SETS -TPER=0 IF HPER L/
031340,000198: 22,3406 02143 -TPER # HPERMIN (300 OR 35) KFT.
031341,000199: 22,3407 45420 TICKTIFF # (-TPER = 0)
031342,000200: 22,3410 43345 TICKTPER DLOAD DAD # (-TPER NON ZERO) TFF WAS NOT COMPUTED,
031343,000201: 22,3411 02143 -TPER # BUT WAS SET TO 59M59S. DONT TICK TFF, DO
031344,000202: 22,3412 02211 TSTART82 # TICK -TPER. DISPLAY BOTH.
031345,000203: 22,3413 02143 STORE -TPER # -TPER CORRECTED FOR TIME SINCE V82GOFF1
031346,000204: 22,3414 77776 EXIT # BEGAN.
031347,000205: 22,3415 34753 CAF BIT1
031348,000206: 22,3416 55537 TS V82FLAGS # INFORMS TICKTEST TO INCREMENT ONLY -TPER
031349,000207: 22,3417 05155 TC ENDOFJOB
031350,000208:
031351,000209: 22,3420 43345 TICKTIFF DLOAD DAD # (-TPER=0) TFF WAS COMPUTED. TICK TFF.
031352,000210: 22,3421 02141 TFF # DO NOT TICK -TPER. DISPLAY TFF, BUT NOT
031353,000211: 22,3422 02211 TSTART82 # -TPER.
031354,000212: 22,3423 02141 STORE TFF # TFF CORRECTED FOR TIME SINCE V82GOFF1
031355,000213: 22,3424 77776 EXIT # BEGAN.
031356,000214: 22,3425 34752 CAF BIT2
031357,000215: 22,3426 55537 TS V82FLAGS # INFORMS TICKTEST TO INCREMENT ONLY TFF.
031358,000216: 22,3427 05155 TC ENDOFJOB
031359,000217:
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Page 724
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031361,000219: 22,3430 34747 TICKTEST CAF BIT5 # THIS WAITLIST PROGRAM PERPETUATES ITSELF
031362,000220: 22,3431 71044 MASK EXTVBACT # ONCE A SEC UNTIL BIT 5 OF EXTVBACT =0.
031363,000221: 22,3432 10000 CCS A
031364,000222: 22,3433 03441 TC DOTICK
031365,000223: 22,3434 37712 CAF PRIO25
031366,000224: 22,3435 05072 TC NOVAC # TERMINATE V 82. CANT CALL ENDEXT IN RUPT.
031367,000225: 22,3436 1044 EBANK= EXTVBACT
031368,000226: 22,3436 05472 04062 2CADR ENDEXT
031369,000227:
031370,000228: 22,3440 05261 TC TASKOVER
031371,000229: 22,3441 34777 DOTICK CAF 1SEC # RE-REQUEST TICKTEST.
031372,000230: 22,3442 05203 TC WAITLIST
031373,000231: 22,3443 E4,1540 EBANK= TFF
031374,000232: 22,3443 03430 44064 2CADR TICKTEST
031375,000233:
031376,000234: 22,3445 36244 CAF THREE
031377,000235: 22,3446 71537 MASK V82FLAGS
031378,000236: 22,3447 50000 INDEX A
031379,000237: 22,3450 03451 TC +1
031380,000238: 22,3451 05261 TC TASKOVER # IF NO FLAGBITS SET DONT CHANGE TFF OR
031381,000239: # -TPER, BUT CONTINUE LOOP.
031382,000240: 22,3452 03460 TC TPERTICK # ONLY BIT 1 SET. INCR -TPER BY 1 SEC.
031383,000241: 22,3453 34777 TFFTICK CAF 1SEC # ONLY BIT 2 SET. INCR TFF BY 1 SEC.
031384,000242: 22,3454 54001 TS L
031385,000243: 22,3455 34755 CAF ZERO
031386,000244: 22,3456 21541 DAS TFF
031387,000245: 22,3457 05261 TC TASKOVER
031388,000246: 22,3460 34777 TPERTICK CAF 1SEC
031389,000247: 22,3461 54001 TS L
031390,000248: 22,3462 34755 CAF ZERO
031391,000249: 22,3463 21543 DAS -TPER
031392,000250: 22,3464 05261 TC TASKOVER
031393,000251:
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Page 725
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031395,000253: 22,3465 77776 V82GON EXIT # AVERAGE G ON. USE CURRENT STATE VECTOR
031396,000254: # FOR ORBITAL PARAMETER CALCULATIONS.
031397,000255: 22,3466 35021 CAF PRIO7 # LESS THAN LAMBERT
031398,000256: 22,3467 05105 TC FINDVAC # V82GON1 WILL PERFORM ORBIT CALCULATIONS
031399,000257: 22,3470 E4,1540 EBANK= TFF # ABOUT PROPER BODY APPROX ONCE PER SEC.
031400,000258: 22,3470 03503 44064 2CADR V82GON1
031401,000259:
031402,000260: 22,3472 00003 RELINT
031403,000261: 22,3473 10067 CCS NEWJOB # WITHOLD V16 N44 UNTIL FIRST ORBIT CALC
031404,000262: 22,3474 05122 TC CHANG1 # IS DONE. NOTE: V82GON1 (PRIO7, FINDVAC
031405,000263: # JOB) IS COMPLETED BEFORE V82GON (PRIO7,
031406,000264: # NOVAC JOB).
031407,000265: 22,3475 33317 V82REDSP CAF V16N44 # MONITOR HAPO, HPER, TFF
031408,000266: 22,3476 04616 TC BANKCALL
031409,000267: 22,3477 20212 CADR GOXDSPF
031410,000268: 22,3500 05563 TC B5OFF # TERM THIS TELLS V82GON1 TO KILL ITSELF.
031411,000269: 22,3501 05563 TC B5OFF # PROC DITTO.
031412,000270: 22,3502 03475 TC V82REDSP # RECYCLE
031413,000271:
031414,000272: 22,3503 06036 V82GON1 TC INTPRET # THIS EXEC PROGRAM PERPETUATES ITSELF
031415,000273: # ONCE A SEC UNTIL BIT 5 OF EXTVBACT =0.
031416,000274: 22,3504 52175 VLOAD GOTO # HOLDS OFF CCS NEWJOB BETWEEN RN AND
031417,000275: 22,3505 01221 RN # VN FETCH SO RN, VN ARE FROM SAME
031418,000276: 22,3506 45507 NEXTLINE # STATE VECTOR UPDATE.
031419,000277: 22,3507 26213 NEXTLINE STOVL RONE # RN AT (-29)M FOR EARTH OR MOON
031420,000278: 22,3510 01227 VN
031421,000279: 22,3511 02221 STORE VONE # VN AT (-7)M/CS FOR EARTH OR MOON
031422,000280: 22,3512 52014 BON GOTO
031423,000281: 22,3513 04304 MOONTHIS # FLAG INDICATES BODY ABOUT WHICH ORBITAL
031424,000282: 22,3514 45516 MOONGON # CALCULATIONS ARE TO BE PERFORMED.
031425,000283: 22,3515 45527 EARTHGON # IF SET - MOON, IF RESET - EARTH.
031426,000284:
031427,000285: 22,3516 71214 MOONGON SET DLOAD
031428,000286: 22,3517 03475 V82EMFLG # INDICATE MOON SCALING FOR SR30.1
031429,000287: 22,3520 04001 1/RTMUM # LUNAR PARAMETERS LOADED HERE FOR SR30.1
031430,000288: 22,3521 14037 STODL TFF/RTMU
031431,000289: 22,3522 05364 MINPERM
031432,000290: 22,3523 26205 STOVL HPERMIN
031433,000291: 22,3524 02023 RLS # SCALED AT (-27)M.
031434,000292: 22,3525 52046 ABVAL GOTO
031435,000293: 22,3526 45536 V82GON2
031436,000294: 22,3527 71214 EARTHGON CLEAR DLOAD
031437,000295: 22,3530 03675 V82EMFLG # INDICATE EARTH SCALING FOR SR30.1
031438,000296: 22,3531 04003 1/RTMUE # EARTH PARAMETERS LOADED HERE FOR SR30.1
031439,000297: 22,3532 14037 STODL TFF/RTMU
031440,000298: 22,3533 05366 MINPERE
031441,000299: 22,3534 16205 STODL HPERMIN
031442,000300: 22,3535 06276 RPAD
031443,000301: 22,3536 36207 V82GON2 STCALL RPADTEM # COMMON CODE FOR EARTH & MOON.
031444,000302: 22,3537 45551 SR30.1
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Page 726
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031446,000304: 22,3540 77776 EXIT
031447,000305: 22,3541 34747 V82GON3 CAF BIT5
031448,000306: 22,3542 71044 MASK EXTVBACT # SEE IF ASTRONAUT HAS SIGNALLED TERMINATE
031449,000307: 22,3543 00006 EXTEND
031450,000308: 22,3544 15472 BZF ENDEXT # YES, TERMINATE VB 82 LOOP
031451,000309: 22,3545 34777 CAF 1SEC
031452,000310: 22,3546 04616 TC BANKCALL # WAIT ONE SECOND BEFORE REPEATING
031453,000311: 22,3547 01735 CADR DELAYJOB # ORBITAL PARAMETER COMPUTATION.
031454,000312: 22,3550 03503 TC V82GON1
031455,000313:
031456,000314: 22,3551 22,3541 SPLRET = V82GON3
031457,000315:
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Page 727
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031459,000317: # SUBROUTINE NAME: SR30.1
031460,000318: # MOD NO: 0 DATE: 16 FEB 67
031461,000319: # MOD BY: RR BAIRNSFATHER LOG SECTION: R32
031462,000320: # MOD NO: 1 MOD BY: RR BAIRNSFATHER DATE: 11 APR 67 SR30.1 CHANGED TO ALLOW MONITOR OPERN
031463,000321: # MOD NO: 2 MOD BY: RR BAIRNSFATHER DATE: 14 APR 67 ADD OVFL CK FOR RAPO
031464,000322: # MOD NO: 3 MOD BY ALONSO DATE: 11 DEC 67 SUBROUTINE REWRITTEN
031465,000323: # MOD NO: 4 MOD BY ALONSO DATE: 26 MAR 68 PROG MOD TO HANDLE DIF EARTH/MOON SCALE
031466,000324: # MOD NO: 5 MOD BY: RR BAIRNSFATHER DATE: 6 AUG 68 OVFL CK FOR HAPO & HPER. VOIDS MOD #2.
031467,000325:
031468,000326: # NEW FUNCTIONAL DESCRIPTION: ORBITAL PARAMETERS DISPLAY FOR NOUNS 32 AND 44.
031469,000327: # SR30.1 CALLS TFFCONMU AND TFFRP/RA TO CALCULATE RPER (PERIGEE RADIUS),
031470,000328: # RAPO (APOGEE RADIUS), HPER (PERIGEE HEIGHT ABOVE LAUNCH PAD OR LUNAR
031471,000329: # LANDING SITE), HAPO (APOGEE HEIGHT AS ABOVE), TPER (TIME TO PERIGEE),
031472,000330: # TFF (TIME TO INTERSECT 300 KFT ABOVE PAD OR 35KFT ABOVE LANDING SITE).
031473,000331: # IF HPER IS GREATER THAN OR EQUAL TO HPERMIN, CALCULATES TPER AND STORES
031474,000332: # NEGATIVE IN -TPER. OTHERWISE STORES +0 IN -TPER. WHENEVER TPER IS
031475,000333: # CALCULATED, TFF IS NOT COMPUTABLE AND DEFAULTS TO -59MIN 59SEC. IF HAPO
031476,000334: # WOULD EXCEED 9999.9 NM, IT IS LIMITED TO THAT VALUE FOR DISPLAY.
031477,000335:
031478,000336: # ADDENDUM: HAPO AND HPER SHOULD BE CHANGED TO READ HAPOX AND HPERX IN THE
031479,000337: # ABOVE REMARKS.
031480,000338:
031481,000339: # CALLING SEQUENCE: CALL
031482,000340: # SR30.1
031483,000341:
031484,000342: # SUBROUTINES CALLED: TFFCONMU, TFFRP/RA, CALCTPER, CALCTFF
031485,000343:
031486,000344: # NORMAL EXIT MODE: CALLING LINE +1 (STILL IN INTERPRETIVE MODE)
031487,000345:
031488,000346: # ALARMS: NONE
031489,000347:
031490,000348: # OUTPUT: RAPO (-29) M EARTH APOGEE RADIUS EARTH CENTERED COORD.
031491,000349: # (-27) M MOON MOON CENTERED COORD.
031492,000350: # RPER (-29) M EARTH PERIGEE RADIUS EARTH CENTERED COORD.
031493,000351: # (-27) M MOON MOON CENTERED COORD.
031494,000352: # HAPOX (-29) M APOGEE ALTITUDE ABOVE PAD OR LAND. SITE MAX VALUE LIMITED TO 9999.9 NM.
031495,000353: # HPERX (-29) M PERIGEE ALT. ABOVE PAD OR LAND. SITE MAX VALUE LIMITED TO 9999.9 NM.
031496,000354: # TFF (-28) CS TIME TO 300KFT OR 35KFT ALTITUDE
031497,000355: # -TPER (-28) CS TIME TO PERIGEE
031498,000356:
031499,000357: # ERASABLE INITIALIZATION REQUIRED -
031500,000358: # TFF/RTMU (+17) EARTH RECIPROCAL OF PROPER GRAV CONSTANT FOR
031501,000359: # (+14) MOON EARTH OR MOON = 1/SQRT(MU).
031502,000360: # RONE (-29) M STATE VECTOR
031503,000361: # VONE (-7) M/CS STATE VECTOR
031504,000362: # RPADTEM (-29) M EARTH RADIUS OF LAUNCH PAD OR LUNAR LANDING
031505,000363: # (-27) M MOON SITE.
031506,000364: # HPERMIN (-29) M EARTH (300 OR 35) KFT MINIMUM PERIGEE ALTITUDE
031507,000365: # (-27) M MOON ABOVE LAUNCH PAD OR LUNAR LANDING SITE.
031508,000366: # V82EMFLG (INT SW BIT) RESET FOR EARTH, SET FOR MOON.
031509,000367:
031510,000368: # DEBRIS: QPRET, PDL, S2
031511,000369:
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Page 728
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031513,000371: 22,3551 COUNT* $$/SR30S
031514,000372:
031515,000373: 22,3551 44001 SR30.1 SETPD STQ # INITIALIZE PUSHDOWN LIST.
031516,000374: 22,3552 00001 0
031517,000375: 22,3553 00051 S2
031518,000376: # SR30.1 INPUT: RONE AT (-29)M EARTH/MOON
031519,000377: # VONE AT (-7)M/CS
031520,000378: # TFFCONMU, TFFRP/RA, CALCTPER AND CALCTFF
031521,000379: # CALLS REQUIRE:
031522,000380: # EARTH CENTERED (NO RESCALING REQUIRED)
031523,000381: # RONE SCALED TO B-29 M
031524,000382: # VONE SCALED TO B-7 M/CS
031525,000383: # MOON CENTERED (RESCALING REQUIRED)
031526,000384: # RONE SCALED TO B-27 M
031527,000385: # VONE SCALED TO B-5 M/CS
031528,000386: 22,3554 77214 BOFF VLOAD
031529,000387: 22,3555 03755 V82EMFLG # OFF FOR EARTH, ON FOR MOON.
031530,000388: 22,3556 45565 TFFCALLS
031531,000389: 22,3557 02213 RONE
031532,000390: 22,3560 77752 VSL2
031533,000391: 22,3561 26213 STOVL RONE
031534,000392: 22,3562 02221 VONE
031535,000393: 22,3563 77752 VSL2
031536,000394: 22,3564 02221 STORE VONE
031537,000395: 22,3565 77624 TFFCALLS CALL
031538,000396: 22,3566 57333 TFFCONMU
031539,000397: 22,3567 77624 CALL # TFFRP/RA COMPUTES RAPO,RPER.
031540,000398: 22,3570 57401 TFFRP/RA
031541,000399: # RETURNS WITH RAPO IN D(MPAC).
031542,000400: 22,3571 77625 DSU
031543,000401: 22,3572 02207 RPADTEM
031544,000402: 22,3573 64414 BOFF SR2R # NEED HAPO AT (-29)M FOR DISPLAY.
031545,000403: # IF MOON CENTERED, RESCALE FROM (-27)M.
031546,000404: # IF EARTH CENTERED ALREADY AT (-29)M.
031547,000405: 22,3574 03755 V82EMFLG # OFF FOR EARTH, ON FOR MOON.
031548,000406: 22,3575 45576 +1
031549,000407: 22,3576 77624 CALL # IF HAPO > MAXNM, SET HAPO =9999.9 NM.
031550,000408: 22,3577 45636 MAXCHK # OTHERWISE STORE (RAPO-RPADTEM) IN HAPO.
031551,000409: 22,3600 16120 STORHAPO STODL HAPOX
031552,000410: 22,3601 00017 RPER
031553,000411: 22,3602 77625 DSU
031554,000412: 22,3603 02207 RPADTEM # GIVES HPER AT (-29)M EARTH, (-27)M MOON.
031555,000413: 22,3604 00161 STORE MPAC +4 # SAVE THIS FOR COMPARISON TO HPERMIN.
031556,000414: 22,3605 64414 BOFF SR2R # NEED HPER AT (-29)M FOR DISPLAY.
031557,000415: # IF MOON CENTERED, RESCALE FROM (-27)M.
031558,000416: # IF EARTH CENTERED ALREADY AT (-29)M.
031559,000417: 22,3606 03755 V82EMFLG # OFF FOR EARTH, ON FOR MOON.
031560,000418: 22,3607 45610 +1
031561,000419: 22,3610 77624 CALL # IF HPER > MAXNM, SET HPER = 9999.9 NM.
031562,000420: 22,3611 45636 MAXCHK
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Page 729
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031564,000422: 22,3612 16122 STORHPER STODL HPERX # STORE (RPER - RPADTEM) INTO HPERX.
031565,000423: 22,3613 00161 MPAC +4
031566,000424: 22,3614 51025 DSU BPL # HPERMIN AT (-29)M FOR EARTH, (-27)M MOON
031567,000425: 22,3615 02205 HPERMIN # IF HPER L/ HPERMIN (300 OR 35) KFT,
031568,000426: 22,3616 45622 DOTPER # THEN ZERO INTO -TPER.
031569,000427: 22,3617 52145 DLOAD GOTO # OTHERWISE CALCULATE TPER.
031570,000428: 22,3620 06424 HI6ZEROS
031571,000429: 22,3621 45626 SKIPTPER
031572,000430: 22,3622 45145 DOTPER DLOAD CALL
031573,000431: 22,3623 00017 RPER
031574,000432: 22,3624 57437 CALCTPER
031575,000433: 22,3625 77676 DCOMP # TPER IS PUT NEG INTO -TPER.
031576,000434: 22,3626 16143 SKIPTPER STODL -TPER
031577,000435: 22,3627 02205 HPERMIN # HPERMIN AT (-29)M FOR EARTH, (-27)M MOON
031578,000436: 22,3630 45015 DAD CALL
031579,000437: 22,3631 02207 RPADTEM # RPADTEM AT (-29)M FOR EARTH, (-27)M MOON
031580,000438: 22,3632 57442 CALCTFF # GIVES 59M59S FOR TFF IF RPER G/
031581,000439: 22,3633 77676 DCOMP # HPERMIN + RPADTEM. (TPER WAS NON ZERO)
031582,000440: 22,3634 36141 STCALL TFF # OTHERWISE COMPUTES TFF. (GOTO)
031583,000441: 22,3635 00051 S2
031584,000442:
031585,000443: 22,3636 51025 MAXCHK DSU BPL # IF C(MPAC) > 9999.9 NM, MPAC = 9999.9 NM
031586,000444: 22,3637 05646 MAXNM
031587,000445: 22,3640 45643 +3 # OTHERWISE C(MPAC) = B(MPAC).
031588,000446: 22,3641 43415 DAD RVQ
031589,000447: 22,3642 05646 MAXNM
031590,000448: 22,3643 43545 +3 DLOAD RVQ # (USED BY P30 - P37 ALSO)
031591,000449: 22,3644 05646 MAXNM
031592,000450:
031593,000451: 22,3645 01065 05603 MAXNM 2OCT 01065 05603
031594,000452:
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031597,000455:
End of include-file R30.agc. Parent file is MAIN.agc