Source Code
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These source-code files are part of a reconstructed copy of LM131 revision 1,
the final release of the Apollo 13 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The source reconstruction began with source code of Luminary 131 previously
transcribed from a digitized copy of that program. A dump of the flight spare
core rope memory module B5, part number 2010802-171, serial number RAY 411,
was obtained. This module is the only module different between Luminary 131
and LM131 revision 1. The dump was disassembled and all changes were incorporated
into these source files. Note that page numbers in the reconstructed code match
those on the Luminary 131 printout, although the changed code would likely have
changed page numbers for a real LM131 revision 1 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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029977,000002: ## Copyright: Public domain.
029978,000003: ## Filename: R30.agc
029979,000004: ## Purpose: A section of LM131 revision 1.
029980,000005: ## It is part of the reconstructed source code for the final
029981,000006: ## release of the flight software for the Lunar Module's (LM)
029982,000007: ## Apollo Guidance Computer (AGC) for Apollo 13. The code has
029983,000008: ## been reconstructed from a listing of Luminary 131 and a dump
029984,000009: ## of a core rope memory module B5, part number 2010802-171,
029985,000010: ## which is the only module different between LM131 revision 1
029986,000011: ## and Luminary 131. The executable generated from this source
029987,000012: ## has been verified against the module dump, so while the names,
029988,000013: ## comments, and ordering may not be exactly correct, the
029989,000014: ## resulting binary is.
029990,000015: ## Reference: pp. 714-724
029991,000016: ## Assembler: yaYUL
029992,000017: ## Contact: Ron Burkey <info@sandroid.org>.
029993,000018: ## Website: www.ibiblio.org/apollo/index.html
029994,000019: ## Mod history: 2022-10-28 MAS Created from Luminary 131.
029995,000020:
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Page 714
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029997,000022: # SUBROUTINE NAME: V82CALL
029998,000023: # MOD NO: 0 DATE: 16 FEB 67
029999,000024: # MOD BY: RR BAIRNSFATHER LOG SECTION: R30
030000,000025: # MOD NO: 1 MOD BY: RR BAIRNSFATHER DATE: 11 APR 67 SR30.1 CHANGED TO ALLOW MONITOR OPERN
030001,000026: # MOD NO: 2 MOD BY ALONSO DATE: 11 DEC 67 VB82 PROGRAM REWRITTEN
030002,000027: # MOD NO: 3 MOD BY ALONSO DATE: 26 MAR 68 PROG MOD TO HANDLE DIF EARTH/MOON SCALE
030003,000028:
030004,000029: # NEW FUNCTIONAL DESCRIPTION: CALLED BY VERB 82 ENTER. PRIORITY 10
030005,000030: # USED THROUGHOUT. CALCULATE AND DISPLAY ORBITAL PARAMETERS
030006,000031:
030007,000032: # 1. IF AVERAGE G IS OFF:
030008,000033: # FLASH DISPLAY V04N06. R2 INDICATES WHICH SHIP'S STATE VECTOR IS
030009,000034: # TO BE UPDATED. INITIAL CHOICE IS THIS SHIP (R2=1). ASTRONAUT
030010,000035: # CAN CHANGE TO OTHER SHIP BY V22EXE, WHERE X NOT EQ 1.
030011,000036: # SELECTED STATE VECTOR UPDATED BY THISPREC (OTHPREC).
030012,000037: # CALLS SR30.1 (WHICH CALLS TFFCONMU + TFFRP/RA) TO CALCULATE
030013,000038: # RPER (PERIGEE RADIUS), RAPO (APOGEE RADIUS), HPER (PERIGEE
030014,000039: # HEIGHT ABOVE LAUNCH PAD OR LUNAR LANDING SITE), HAPO (APOGEE
030015,000040: # HEIGHT AS ABOVE), TPER (TIME TO PERIGEE), TFF (TIME TO
030016,000041: # INTERSECT 300 KFT ABOVE PAD OR 35KFT ABOVE LANDING SITE).
030017,000042: # FLASH MONITOR V16N44 (HAPO, HPER, TFF). TFF IS -59M59S IF IT WAS
030018,000043: # NOT COMPUTABLE, OTHERWISE IT INCREMENTS ONCE PER SECOND.
030019,000044: # ASTRONAUT HAS OPTION TO MONITOR TPER BY KEYING IN N 32 E.
030020,000045: # DISPLAY IS IN HMS, IS NEGATIVE (AS WAS TFF), AND INCREMENTS
030021,000046: # ONCE PER SECOND ONLY IF TFF DISPLAY WAS -59M59S.
030022,000047: # 2. IF AVERAGE G IS ON:
030023,000048: # CALLS SR30.1 APPROX EVERY TWO SECS. STATE VECTOR IS ALWAYS
030024,000049: # FOR THIS VEHICLE. V82 DOES NOT DISTURB STATE VECTOR. RESULTS
030025,000050: # OF SR30.1 ARE RAPO, RPER, HAPO, HPER, TPER, TFF.
030026,000051: # FLASH MONITOR V16N44 (HAPO, HPER, TFF).
030027,000052: # ADDENDUM: HAPO AND HPER SHOULD BE CHANGED TO READ HAPOX AND HPERX IN THE
030028,000053: # ABOVE REMARKS.
030029,000054:
030030,000055: # CALLING SEQUENCE: VERB 82 ENTER.
030031,000056:
030032,000057: # SUBROUTINES CALLED: SR30.1, GOXDSPF
030033,000058: # MAYBE - THISPREC, OTHPREC, LOADTIME, DELRSPL
030034,000059:
030035,000060: # NORMAL EXIT MODES: TC ENDEXT
030036,000061:
030037,000062: # ALARMS: NONE
030038,000063:
030039,000064: # OUTPUT: HAPOX (-29) M
030040,000065: # HPERX (-29) M
030041,000066: # RAPO (-29) M EARTH
030042,000067: # (-27) M MOON
030043,000068: # RPER (-29) M EARTH
030044,000069: # (-27) M MOON
030045,000070: # TFF (-28) CS CONTAINS NEGATIVE QUANTITY
030046,000071: # -TPER (-28) CS CONTAINS NEGATIVE QUANTITY
030047,000072:
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Page 715
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030049,000074: # ERASABLE INITIALIZATION REQUIRED: STATE VECTOR.
030050,000075:
030051,000076: # DEBRIS: QPRET, RONE, VONE, TFF/RTMU, HPERMIN, RPADTEM, V82EMFLG.
030052,000077: # MAYBE: TSTART82, V82FLAGS, TDEC1.
030053,000078:
030054,000079: 13,2347 E4,1517 EBANK= HAPOX
030055,000080: 31,2144 BANK 31
030056,000081: 22,2000 SETLOC R30LOC
030057,000082: 22,2000 BANK
030058,000083: 22,3242 COUNT* $$/R30
030059,000084:
030060,000085: 22,3242 06042 V82CALL TC INTPRET
030061,000086: 22,3243 52014 BON GOTO
030062,000087: 22,3244 03712 AVEGFLAG
030063,000088: 22,3245 45465 V82GON # IF AVERAGE G ON
030064,000089: 22,3246 45247 V82GOFF # IF AVERAGE G OFF
030065,000090:
030066,000091: 22,3247 77776 V82GOFF EXIT # ALLOW ASTRONAUT TO SELECT VEHICLE
030067,000092: 22,3250 34752 CAF TWO # DESIRED FOR ORBITAL PARAMETERS
030068,000093: 22,3251 55050 TS OPTIONX # CALCULATION AND DISPLAY.
030069,000094: 22,3252 34753 CAF ONE
030070,000095: 22,3253 55051 TS OPTIONX +1
030071,000096: 22,3254 33316 CAF OPTIONVN # V 04 N 06
030072,000097: 22,3255 04616 TC BANKCALL
030073,000098: 22,3256 20334 CADR GOXDSPF
030074,000099: 22,3257 05472 TC ENDEXT # TERMINATE
030075,000100: 22,3260 03262 TC +2 # PROCEED
030076,000101: 22,3261 03254 TC -5 # DATA IN. OPTION1+1 = 1 FOR THIS VEHICLE.
030077,000102: # UNEQ 1 FOR OTHER VEHICLE.
030078,000103: 22,3262 34750 CAF BIT4 # 80 MS
030079,000104: 22,3263 05203 TC WAITLIST
030080,000105: 22,3264 E4,1540 EBANK= TFF
030081,000106: 22,3264 03430 44064 2CADR TICKTEST
030082,000107:
030083,000108: 22,3266 00003 RELINT
030084,000109: 22,3267 33320 V82GOFLP CAF TFFBANK # MAJOR RECYCLE LOOP ENTRY
030085,000110: 22,3270 54003 TS EBANK
030086,000111: 22,3271 34755 CAF ZERO
030087,000112: 22,3272 55537 TS V82FLAGS # ZERO FLAGS FOR TICKTEST. INHIBITS
030088,000113: # DECREMENTING OF TFF AND -TPER.
030089,000114: 22,3273 35021 CAF PRIO7
030090,000115: 22,3274 05105 TC FINDVAC # V82GOFF1 WILL EXECUTE STATE VECTOR
030091,000116: 22,3275 E4,1540 EBANK= TFF # UPDATE AND ORBIT CALCULATIONS FOR
030092,000117: 22,3275 03321 44064 2CADR V82GOFF1 # SELECTED VEHICLE ABOUT PROPER BODY.
030093,000118:
030094,000119: 22,3277 00003 RELINT
030095,000120: 22,3300 36250 V82STALL CAF THREE # STALL IN THIS LOOP AND WITHOLD V 16 N 44
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Page 716
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030097,000122: 22,3301 71537 MASK V82FLAGS # UNTIL STATE VECTOR UPDATE SETS ONE OF
030098,000123: 22,3302 10000 CCS A # OUR FLAG BITS.
030099,000124: 22,3303 03310 TC FLAGGON # EXIT FROM STALL LOOP.
030100,000125: 22,3304 34777 CAF 1SEC
030101,000126: 22,3305 04616 TC BANKCALL
030102,000127: 22,3306 01736 CADR DELAYJOB
030103,000128: 22,3307 03300 TC V82STALL
030104,000129:
030105,000130: 22,3310 33317 FLAGGON CAF V16N44 # MONITOR HAPO,HPER,TFF.
030106,000131: 22,3311 04616 TC BANKCALL
030107,000132: 22,3312 20334 CADR GOXDSPF
030108,000133: 22,3313 05563 TC B5OFF # TERM THIS TELLS TICKTEST TO KILL ITSELF
030109,000134: 22,3314 05563 TC B5OFF # PROCEED DITTO
030110,000135: 22,3315 03267 TC V82GOFLP # RECYCLE RECOMPUTE STATE VECT + DISPLAY
030111,000136:
030112,000137: 22,3316 01014 OPTIONVN VN 412
030113,000138: 22,3317 04054 V16N44 VN 1644
030114,000139: 22,3320 02140 TFFBANK ECADR TFF
030115,000140:
030116,000141: 22,3321 06042 V82GOFF1 TC INTPRET
030117,000142: 22,3322 77634 RTB
030118,000143: 22,3323 21574 LOADTIME
030119,000144: 22,3324 00041 STORE TDEC1 # TIME FOR STATE VECTOR UPDATE.
030120,000145: 22,3325 02205 STORE TSTART82 # TIME FOR INTERNAL USE.
030121,000146: 22,3326 77776 EXIT
030122,000147: 22,3327 41051 CS OPTIONX +1 # 1 FOR THIS VEHICLE, NOT 1 FOR OTHER.
030123,000148: 22,3330 64753 AD ONE
030124,000149: 22,3331 00006 EXTEND
030125,000150: 22,3332 13356 BZF THISSHIP
030126,000151: 22,3333 06042 OTHSHIP TC INTPRET
030127,000152: 22,3334 77624 CALL # CALL STATE VECTOR UPDATE FOR OTHER SHIP.
030128,000153: 22,3335 27042 OTHPREC
030129,000154: 22,3336 77775 BOTHSHIP VLOAD # MOVE RESULTS INTO TFFCONIC STORAGE AREAS
030130,000155: 22,3337 00001 RATT # TO BE CALLED BY SR30.1.
030131,000156: 22,3340 26207 STOVL RONE # RATT AT (-29)M FOR EARTH OR MOON
030132,000157: 22,3341 00007 VATT
030133,000158: 22,3342 02215 STORE VONE # VATT AT (-7)M/CS FOR EARTH OR MOON
030134,000159: 22,3343 77743 DLOAD*
030135,000160: 22,3344 73774 1/RTMUE,2 # X2 IS 0 FOR EARTH CENTERED STATE VEC
030136,000161: 22,3345 00037 STORE TFF/RTMU # X2 IS 2 FOR MOON
030137,000162: 22,3346 77743 DLOAD* # AS LEFT BY THISPREC OR OTHPREC.
030138,000163: 22,3347 72411 MINPERE,2
030139,000164: 22,3350 02201 STORE HPERMIN # TFFRTMU, HPERMIN AND RPADTEM ARE ALL
030140,000165: 22,3351 46135 SLOAD BHIZ # EARTH/MOON PARAMETERS AS SET HERE.
030141,000166: 22,3352 00050 X2
030142,000167: 22,3353 45367 EARTHPAD
030143,000168: 22,3354 77650 GOTO
030144,000169: 22,3355 45373 MOONPAD
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Page 717
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030146,000171: 22,3356 06042 THISSHIP TC INTPRET
030147,000172: 22,3357 77624 CALL # CALL STATE VECTOR UPDATE FOR THIS SHIP.
030148,000173: 22,3360 27056 THISPREC
030149,000174: 22,3361 77650 GOTO
030150,000175: 22,3362 45336 BOTHSHIP
030151,000176:
030152,000177: # THE FOLLOWING CONSTANTS ARE PAIRWISE INDEXED. DO NOT SEPARATE PAIRS.
030153,000178:
030154,000179: 22,3363 00001 11530 MINPERM 2DEC 10668 B-27 # 35 KFT MIN PERIGEE HEIGHT FOR MOON(-27)M
030155,000180: 22,3365 00002 31230 MINPERE 2DEC 91440 B-29 # 300 KFT (-29)M FOR EARTH
030156,000181:
030157,000182: 22,3367 43145 EARTHPAD DLOAD CLRGO # PAD 37-B RADIUS. SCALED AT (-29)M.
030158,000183: 22,3370 06340 RPAD
030159,000184: 22,3371 03635 V82EMFLG # INDICATE EARTH SCALING FOR SR30.1
030160,000185: 22,3372 45377 BOTHPAD
030161,000186:
030162,000187: 22,3373 51575 MOONPAD VLOAD ABVAL # COMPUTE MOON PAD RADIUS FROM RLS VECTOR.
030163,000188: 22,3374 02023 RLS # SCALED AT (-27)M.
030164,000189: 22,3375 77614 SET
030165,000190: 22,3376 03475 V82EMFLG # INDICATE MOON SCALING FOR SR30.1
030166,000191: 22,3377 36203 BOTHPAD STCALL RPADTEM
030167,000192: 22,3400 45551 SR30.1 # CALCULATE ORBITAL PARAMETERS
030168,000193: 22,3401 45234 RTB DSU
030169,000194: 22,3402 21574 LOADTIME
030170,000195: 22,3403 02205 TSTART82 # PRESENT TIME - TIME V82GOFF1 BEGAN
030171,000196: 22,3404 02205 STORE TSTART82 # SAVE IT
030172,000197: 22,3405 53145 DLOAD BZE # SR30.1 SETS -TPER=0 IF HPER L/
030173,000198: 22,3406 02143 -TPER # HPERMIN (300 OR 35) KFT.
030174,000199: 22,3407 45420 TICKTFF # (-TPER = 0)
030175,000200: 22,3410 43345 TICKTPER DLOAD DAD # (-TPER NON ZERO) TFF WAS NOT COMPUTED,
030176,000201: 22,3411 02143 -TPER # BUT WAS SET TO 59M59S. DONT TICK TFF, DO
030177,000202: 22,3412 02205 TSTART82 # TICK -TPER. DISPLAY BOTH.
030178,000203: 22,3413 02143 STORE -TPER # -TPER CORRECTED FOR TIME SINCE V82GOFF1
030179,000204: 22,3414 77776 EXIT # BEGAN.
030180,000205: 22,3415 34753 CAF BIT1
030181,000206: 22,3416 55537 TS V82FLAGS # INFORMS TICKTEST TO INCREMENT ONLY -TPER
030182,000207: 22,3417 05155 TC ENDOFJOB
030183,000208:
030184,000209: 22,3420 43345 TICKTFF DLOAD DAD # (-TPER=0) TFF WAS COMPUTED. TICK TFF.
030185,000210: 22,3421 02141 TFF # DO NOT TICK -TPER. DISPLAY TFF, BUT NOT
030186,000211: 22,3422 02205 TSTART82 # -TPER.
030187,000212: 22,3423 02141 STORE TFF # TFF CORRECTED FOR TIME SINCE V82GOFF1
030188,000213: 22,3424 77776 EXIT # BEGAN.
030189,000214: 22,3425 34752 CAF BIT2
030190,000215: 22,3426 55537 TS V82FLAGS # INFORMS TICKTEST TO INCREMENT ONLY TFF.
030191,000216: 22,3427 05155 TC ENDOFJOB
030192,000217:
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Page 718
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030194,000219: 22,3430 34747 TICKTEST CAF BIT5 # THIS WAITLIST PROGRAM PERPETUATES ITSELF
030195,000220: 22,3431 71043 MASK EXTVBACT # ONCE A SEC UNTIL BIT 5 OF EXTVBACT =0.
030196,000221: 22,3432 10000 CCS A
030197,000222: 22,3433 03441 TC DOTICK
030198,000223: 22,3434 37716 CAF PRIO25
030199,000224: 22,3435 05072 TC NOVAC # TERMINATE V 82. CANT CALL ENDEXT IN RUPT.
030200,000225: 22,3436 1043 EBANK= EXTVBACT
030201,000226: 22,3436 05472 04062 2CADR ENDEXT
030202,000227:
030203,000228: 22,3440 05261 TC TASKOVER
030204,000229: 22,3441 34777 DOTICK CAF 1SEC # RE-REQUEST TICKTEST.
030205,000230: 22,3442 05203 TC WAITLIST
030206,000231: 22,3443 E4,1540 EBANK= TFF
030207,000232: 22,3443 03430 44064 2CADR TICKTEST
030208,000233:
030209,000234: 22,3445 36250 CAF THREE
030210,000235: 22,3446 71537 MASK V82FLAGS
030211,000236: 22,3447 50000 INDEX A
030212,000237: 22,3450 03451 TC +1
030213,000238: 22,3451 05261 TC TASKOVER # IF NO FLAGBITS SET DONT CHANGE TFF OR
030214,000239: # -TPER, BUT CONTINUE LOOP.
030215,000240: 22,3452 03460 TC TPERTICK # ONLY BIT 1 SET. INCR -TPER BY 1 SEC.
030216,000241: 22,3453 34777 TFFTICK CAF 1SEC # ONLY BIT 2 SET. INCR TFF BY 1 SEC.
030217,000242: 22,3454 54001 TS L
030218,000243: 22,3455 34755 CAF ZERO
030219,000244: 22,3456 21541 DAS TFF
030220,000245: 22,3457 05261 TC TASKOVER
030221,000246: 22,3460 34777 TPERTICK CAF 1SEC
030222,000247: 22,3461 54001 TS L
030223,000248: 22,3462 34755 CAF ZERO
030224,000249: 22,3463 21543 DAS -TPER
030225,000250: 22,3464 05261 TC TASKOVER
030226,000251:
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Page 719
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030228,000253: 22,3465 77776 V82GON EXIT # AVERAGE G ON. USE CURRENT STATE VECTOR
030229,000254: # FOR ORBITAL PARAMETER CALCULATIONS.
030230,000255: 22,3466 35021 CAF PRIO7 # LESS THAN LAMBERT
030231,000256: 22,3467 05105 TC FINDVAC # V82GON1 WILL PERFORM ORBIT CALCULATIONS
030232,000257: 22,3470 E4,1540 EBANK= TFF # ABOUT PROPER BODY APPROX ONCE PER SEC.
030233,000258: 22,3470 03503 44064 2CADR V82GON1
030234,000259:
030235,000260: 22,3472 00003 RELINT
030236,000261: 22,3473 10067 CCS NEWJOB # WITHOLD V16 N44 UNTIL FIRST ORBIT CALC
030237,000262: 22,3474 05122 TC CHANG1 # IS DONE. NOTE: V82GON1 (PRIO7, FINDVAC
030238,000263: # JOB) IS COMPLETED BEFORE V82GON (PRIO7,
030239,000264: # NOVAC JOB).
030240,000265: 22,3475 33317 V82REDSP CAF V16N44 # MONITOR HAPO, HPER, TFF
030241,000266: 22,3476 04616 TC BANKCALL
030242,000267: 22,3477 20334 CADR GOXDSPF
030243,000268: 22,3500 05563 TC B5OFF # TERM THIS TELLS V82GON1 TO KILL ITSELF.
030244,000269: 22,3501 05563 TC B5OFF # PROC DITTO.
030245,000270: 22,3502 03475 TC V82REDSP # RECYCLE
030246,000271:
030247,000272: 22,3503 06042 V82GON1 TC INTPRET # THIS EXEC PROGRAM PERPETUATES ITSELF
030248,000273: # ONCE A SEC UNTIL BIT 5 OF EXTVBACT =0.
030249,000274: 22,3504 52175 VLOAD GOTO # HOLDS OFF CCS NEWJOB BETWEEN RN AND
030250,000275: 22,3505 01220 RN # VN FETCH SO RN, VN ARE FROM SAME
030251,000276: 22,3506 45507 NEXTLINE # STATE VECTOR UPDATE.
030252,000277: 22,3507 26207 NEXTLINE STOVL RONE # RN AT (-29)M FOR EARTH OR MOON
030253,000278: 22,3510 01226 VN
030254,000279: 22,3511 02215 STORE VONE # VN AT (-7)M/CS FOR EARTH OR MOON
030255,000280: 22,3512 52014 BON GOTO
030256,000281: 22,3513 04304 MOONTHIS # FLAG INDICATES BODY ABOUT WHICH ORBITAL
030257,000282: 22,3514 45516 MOONGON # CALCULATIONS ARE TO BE PERFORMED.
030258,000283: 22,3515 45527 EARTHGON # IF SET - MOON , IF RESET - EARTH.
030259,000284:
030260,000285: 22,3516 71214 MOONGON SET DLOAD
030261,000286: 22,3517 03475 V82EMFLG # INDICATE MOON SCALING FOR SR30.1
030262,000287: 22,3520 04001 1/RTMUM # LUNAR PARAMETERS LOADED HERE FOR SR30.1
030263,000288: 22,3521 14037 STODL TFF/RTMU
030264,000289: 22,3522 05364 MINPERM
030265,000290: 22,3523 26201 STOVL HPERMIN
030266,000291: 22,3524 02023 RLS # SCALED AT (-27)M.
030267,000292: 22,3525 52046 ABVAL GOTO
030268,000293: 22,3526 45536 V82GON2
030269,000294: 22,3527 71214 EARTHGON CLEAR DLOAD
030270,000295: 22,3530 03675 V82EMFLG # INDICATE EARTH SCALING FOR SR30.1
030271,000296: 22,3531 04003 1/RTMUE # EARTH PARAMETERS LOADED HERE FOR SR30.1
030272,000297: 22,3532 14037 STODL TFF/RTMU
030273,000298: 22,3533 05366 MINPERE
030274,000299: 22,3534 16201 STODL HPERMIN
030275,000300: 22,3535 06340 RPAD
030276,000301: 22,3536 36203 V82GON2 STCALL RPADTEM # COMMON CODE FOR EARTH & MOON.
030277,000302: 22,3537 45551 SR30.1
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Page 720
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030279,000304: 22,3540 77776 EXIT
030280,000305: 22,3541 34747 V82GON3 CAF BIT5
030281,000306: 22,3542 71043 MASK EXTVBACT # SEE IF ASTRONAUT HAS SIGNALLED TERMINATE
030282,000307: 22,3543 00006 EXTEND
030283,000308: 22,3544 15472 BZF ENDEXT # YES, TERMINATE VB 82 LOOP
030284,000309: 22,3545 34777 CAF 1SEC
030285,000310: 22,3546 04616 TC BANKCALL # WAIT ONE SECOND BEFORE REPEATING
030286,000311: 22,3547 01736 CADR DELAYJOB # ORBITAL PARAMETER COMPUTATION.
030287,000312: 22,3550 03503 TC V82GON1
030288,000313:
030289,000314: 22,3551 22,3541 SPLRET = V82GON3
030290,000315:
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Page 721
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030292,000317: # SUBROUTINE NAME: SR30.1
030293,000318: # MOD NO: 0 DATE: 16 FEB 67
030294,000319: # MOD BY: RR BAIRNSFATHER LOG SECTION: R32
030295,000320: # MOD NO: 1 MOD BY: RR BAIRNSFATHER DATE: 11 APR 67 SR30.1 CHANGED TO ALLOW MONITOR OPERN
030296,000321: # MOD NO: 2 MOD BY: RR BAIRNSFATHER DATE: 14 APR 67 ADD OVFL CK FOR RAPO
030297,000322: # MOD NO: 3 MOD BY ALONSO DATE: 11 DEC 67 SUBROUTINE REWRITTEN
030298,000323: # MOD NO: 4 MOD BY ALONSO DATE: 26 MAR 68 PROG MOD TO HANDLE DIF EARTH/MOON SCALE
030299,000324: # MOD NO: 5 MOD BY: RR BAIRNSFATHER DATE: 6 AUG 68 OVFL CK FOR HAPO & HPER. VOIDS MOD #2.
030300,000325:
030301,000326: # NEW FUNCTIONAL DESCRIPTION: ORBITAL PARAMETERS DISPLAY FOR NOUNS 32 AND 44.
030302,000327: # SR30.1 CALLS TFFCONMU AND TFFRP/RA TO CALCULATE RPER (PERIGEE RADIUS),
030303,000328: # RAPO (APOGEE RADIUS), HPER (PERIGEE HEIGHT ABOVE LAUNCH PAD OR LUNAR
030304,000329: # LANDING SITE), HAPO (APOGEE HEIGHT AS ABOVE), TPER (TIME TO PERIGEE),
030305,000330: # TFF (TIME TO INTERSECT 300 KFT ABOVE PAD OR 35KFT ABOVE LANDING SITE).
030306,000331: # IF HPER IS GREATER THAN OR EQUAL TO HPERMIN, CALCULATES TPER AND STORES
030307,000332: # NEGATIVE IN -TPER. OTHERWISE STORES +0 IN -TPER. WHENEVER TPER IS
030308,000333: # CALCULATED, TFF IS NOT COMPUTABLE AND DEFAULTS TO -59MIN 59SEC. IF HAPO
030309,000334: # WOULD EXCEED 9999.9 NM, IT IS LIMITED TO THAT VALUE FOR DISPLAY.
030310,000335:
030311,000336: # ADDENDUM: HAPO AND HPER SHOULD BE CHANGED TO READ HAPOX AND HPERX IN THE
030312,000337: # ABOVE REMARKS.
030313,000338:
030314,000339: # CALLING SEQUENCE: CALL
030315,000340: # SR30.1
030316,000341:
030317,000342: # SUBROUTINES CALLED: TFFCONMU, TFFRP/RA, CALCTPER, CALCTFF
030318,000343:
030319,000344: # NORMAL EXIT MODE: CALLING LINE +1 (STILL IN INTERPRETIVE MODE)
030320,000345:
030321,000346: # ALARMS: NONE
030322,000347:
030323,000348: # OUTPUT: RAPO (-29) M EARTH APOGEE RADIUS EARTH CENTERED COORD.
030324,000349: # (-27) M MOON MOON CENTERED COORD.
030325,000350: # RPER (-29) M EARTH PERIGEE RADIUS EARTH CENTERED COORD.
030326,000351: # (-27) M MOON MOON CENTERED COORD.
030327,000352: # HAPOX (-29) M APOGEE ALTITUDE ABOVE PAD OR LAND. SITE MAX VALUE LIMITED TO 9999.9 NM.
030328,000353: # HPERX (-29) M PERIGEE ALT. ABOVE PAD OR LAND. SITE MAX VALUE LIMITED TO 9999.9 NM.
030329,000354: # TFF (-28) CS TIME TO 300KFT OR 35KFT ALTITUDE
030330,000355: # -TPER (-28) CS TIME TO PERIGEE
030331,000356:
030332,000357: # ERASABLE INITIALIZATION REQUIRED-
030333,000358: # TFF/RTMU (+17) EARTH RECIPROCAL OF PROPER GRAV CONSTANT FOR
030334,000359: # (+14) MOON EARTH OR MOON = 1/SQRT(MU).
030335,000360: # RONE (-29) M STATE VECTOR
030336,000361: # VONE (-7) M/CS STATE VECTOR
030337,000362: # RPADTEM (-29) M EARTH RADIUS OF LAUNCH PAD OR LUNAR LANDING
030338,000363: # (-27) M MOON SITE.
030339,000364: # HPERMIN (-29) M EARTH (300 OR 35) KFT MINIMUM PERIGEE ALTITUDE
030340,000365: # (-27) M MOON ABOVE LAUNCH PAD OR LUNAR LANDING SITE.
030341,000366: # V82EMFLG (INT SW BIT) RESET FOR EARTH, SET FOR MOON.
030342,000367:
030343,000368: # DEBRIS: QPRET, PDL, S2
030344,000369:
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Page 722
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030346,000371: 22,3551 COUNT* $$/SR30S
030347,000372:
030348,000373: 22,3551 44001 SR30.1 SETPD STQ # INITIALIZE PUSHDOWN LIST.
030349,000374: 22,3552 00001 0
030350,000375: 22,3553 00051 S2
030351,000376: # SR30.1 INPUT: RONE AT (-29)M EARTH/MOON
030352,000377: # VONE AT (-7)M/CS
030353,000378: # TFFCONMU, TFFRP/RA, CALCTPER AND CALCTFF
030354,000379: # CALLS REQUIRE:
030355,000380: # EARTH CENTERED (NO RESCALING REQUIRED)
030356,000381: # RONE SCALED TO B-29 M
030357,000382: # VONE SCALED TO B-7 M/CS
030358,000383: # MOON CENTERED (RESCALING REQUIRED)
030359,000384: # RONE SCALED TO B-27 M
030360,000385: # VONE SCALED TO B-5 M/CS
030361,000386: 22,3554 77214 BOFF VLOAD
030362,000387: 22,3555 03755 V82EMFLG # OFF FOR EARTH, ON FOR MOON.
030363,000388: 22,3556 45565 TFFCALLS
030364,000389: 22,3557 02207 RONE
030365,000390: 22,3560 77752 VSL2
030366,000391: 22,3561 26207 STOVL RONE
030367,000392: 22,3562 02215 VONE
030368,000393: 22,3563 77752 VSL2
030369,000394: 22,3564 02215 STORE VONE
030370,000395: 22,3565 77624 TFFCALLS CALL
030371,000396: 22,3566 57362 TFFCONMU
030372,000397: 22,3567 77624 CALL # TFFRP/RA COMPUTES RAPO,RPER.
030373,000398: 22,3570 57430 TFFRP/RA
030374,000399: # RETURNS WITH RAPO IN D(MPAC).
030375,000400: 22,3571 77625 DSU
030376,000401: 22,3572 02203 RPADTEM
030377,000402: 22,3573 64414 BOFF SR2R # NEED HAPO AT (-29)M FOR DISPLAY.
030378,000403: # IF MOON CENTERED, RESCALE FROM (-27)M.
030379,000404: # IF EARTH CENTERED ALREADY AT (-29)M.
030380,000405: 22,3574 03755 V82EMFLG # OFF FOR EARTH , ON FOR MOON.
030381,000406: 22,3575 45576 +1
030382,000407: 22,3576 77624 CALL # IF HAPO > MAXNM, SET HAPO =9999.9 NM.
030383,000408: 22,3577 45636 MAXCHK # OTHERWISE STORE (RAPO-RPADTEM) IN HAPO.
030384,000409: 22,3600 16120 STORHAPO STODL HAPOX
030385,000410: 22,3601 00017 RPER
030386,000411: 22,3602 77625 DSU
030387,000412: 22,3603 02203 RPADTEM # GIVES HPER AT (-29)M EARTH, (-27)M MOON.
030388,000413: 22,3604 00161 STORE MPAC +4 # SAVE THIS FOR COMPARISON TO HPERMIN.
030389,000414: 22,3605 64414 BOFF SR2R # NEED HPER AT (-29)M FOR DISPLAY.
030390,000415: # IF MOON CENTERED, RESCALE FROM (-27)M.
030391,000416: # IF EARTH CENTERED ALREADY AT (-29)M.
030392,000417: 22,3606 03755 V82EMFLG # OFF FOR EARTH, ON FOR MOON.
030393,000418: 22,3607 45610 +1
030394,000419: 22,3610 77624 CALL # IF HPER > MAXNM, SET HPER = 9999.9 NM.
030395,000420: 22,3611 45636 MAXCHK
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Page 723
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030397,000422: 22,3612 16122 STORHPER STODL HPERX # STORE (RPER - RPADTEM) INTO HPERX.
030398,000423: 22,3613 00161 MPAC +4
030399,000424: 22,3614 51025 DSU BPL # HPERMIN AT (-29)M FOR EARTH, (-27)M MOON
030400,000425: 22,3615 02201 HPERMIN # IF HPER L/ HPERMIN (300 OR 35) KFT,
030401,000426: 22,3616 45622 DOTPER # THEN ZERO INTO -TPER.
030402,000427: 22,3617 52145 DLOAD GOTO # OTHERWISE CALCULATE TPER.
030403,000428: 22,3620 06524 HI6ZEROS
030404,000429: 22,3621 45626 SKIPTPER
030405,000430: 22,3622 45145 DOTPER DLOAD CALL
030406,000431: 22,3623 00017 RPER
030407,000432: 22,3624 57466 CALCTPER
030408,000433: 22,3625 77676 DCOMP # TPER IS PUT NEG INTO -TPER.
030409,000434: 22,3626 16143 SKIPTPER STODL -TPER
030410,000435: 22,3627 02201 HPERMIN # HPERMIN AT (-29)M FOR EARTH, (-27)M MOON
030411,000436: 22,3630 45015 DAD CALL
030412,000437: 22,3631 02203 RPADTEM # RPADTEM AT (-29)M FOR EARTH, (-27)M MOON
030413,000438: 22,3632 57471 CALCTFF # GIVES 59M59S FOR TFF IF RPER G/
030414,000439: 22,3633 77676 DCOMP # HPERMIN + RPADTEM. (TPER WAS NON ZERO)
030415,000440: 22,3634 36141 STCALL TFF # OTHERWISE COMPUTES TFF. (GOTO)
030416,000441: 22,3635 00051 S2
030417,000442:
030418,000443: 22,3636 51025 MAXCHK DSU BPL # IF C(MPAC) > 9999.9 NM, MPAC = 9999.9 NM
030419,000444: 22,3637 05646 MAXNM
030420,000445: 22,3640 45643 +3 # OTHERWISE C(MPAC) = B(MPAC).
030421,000446: 22,3641 43415 DAD RVQ
030422,000447: 22,3642 05646 MAXNM
030423,000448: 22,3643 43545 +3 DLOAD RVQ # (USED BY P30 - P37 ALSO)
030424,000449: 22,3644 05646 MAXNM
030425,000450:
030426,000451: 22,3645 01065 05603 MAXNM 2OCT 0106505603
030427,000452:
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Page 724
Empty page.
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030430,000455:
End of include-file R30.agc. Parent file is MAIN.agc