Source Code
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These source-code files are part of a reconstructed copy of Artemis 071, the
first release of the Apollo 15 through 17 Command Module (CM) Apollo Guidance
Computer (AGC) software.
The reconstruction began with source code of Artemis 072 previously transcribed
from a digitized copy of that program. The code was then updated by undoing
changes between the two versions. The reconstruction was verified by matching
memory-bank checksums to those listed in drawing 2021154-. Note that page
numbers in the reconstructed code match those on the Artemis 072 printout,
although the changed code would likely have changed page numbers for a real
Artemis 071 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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053067,000002: ## Copyright: Public domain.
053068,000003: ## Filename: PLANETARY_INERTIAL_ORIENTATION.agc
053069,000004: ## Purpose: A section of Artemis revision 071.
053070,000005: ## It is part of the reconstructed source code for the first
053071,000006: ## release of the flight software for the Command Module's
053072,000007: ## (CM) Apollo Guidance Computer (AGC) for Apollo 15 through
053073,000008: ## 17. The code has been recreated from a copy of Artemis 072.
053074,000009: ## It has been adapted such that the resulting bugger words
053075,000010: ## exactly match those specified for Artemis 071 in NASA
053076,000011: ## drawing 2021154-, which gives relatively high confidence
053077,000012: ## that the reconstruction is correct.
053078,000013: ## Reference: 1243
053079,000014: ## Assembler: yaYUL
053080,000015: ## Contact: Ron Burkey <info@sandroid.org>.
053081,000016: ## Website: www.ibiblio.org/apollo/index.html
053082,000017: ## Mod history: 2019-08-14 MAS Created from Artemis 072.
053083,000018:
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Page 1243
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053085,000020: # ..... RP-TO-R SUBROUTINE .....
053086,000021: # SUBROUTINE TO CONVERT RP (VECTOR IN PLANETARY COORDINATE SYSTEM, EITHER
053087,000022: # EARTH-FIXED OR MOON-FIXED) TO R (SAME VECTOR IN THE BASIC REF. SYSTEM)
053088,000023:
053089,000024: # R = MT(T) * (RP + LP X RP) MT = M MATRIX TRANSPOSE
053090,000025:
053091,000026: # CALLING SEQUENCE
053092,000027: # L CALL
053093,000028: # L+1 RP-TO-R
053094,000029:
053095,000030: # SUBROUTINES USED
053096,000031: # EARTHMX, MOONMX, EARTHL
053097,000032:
053098,000033: # ITEMS AVAILABLE FROM LAUNCH DATA
053099,000034: # 504LM = THE LIBRATION VECTOR L OF THE MOON AT TIME TIMSUBL, EXPRESSED
053100,000035: # IN THE MOON-FIXED COORD. SYSTEM RADIANS B0
053101,000036:
053102,000037: # ITEMS NECESSARY FOR SUBR. USED (SEE DESCRIPTION OF SUBR.)
053103,000038:
053104,000039: # INPUT
053105,000040: # MPAC = 0 FOR EARTH, NON-ZERO FOR MOON
053106,000041: # 0-5D = RP VECTOR
053107,000042: # 6-7D = TIME
053108,000043:
053109,000044: # OUTPUT
053110,000045: # MPAC = R VECTOR METERS B-29 FOR EARTH, B-27 FOR MOON
053111,000046:
053112,000047: 26,2000 SETLOC PLANTIN
053113,000048: 26,2000 BANK
053114,000049:
053115,000050: 26,3345 COUNT* $$/LUROT
053116,000051:
053117,000052: 26,3345 46020 RP-TO-R STQ BHIZ
053118,000053: 26,3346 00050 RPREXIT
053119,000054: 26,3347 55362 RPTORA
053120,000055: 26,3350 77624 CALL # COMPUTE M MATRIX FOR MOON
053121,000056: 26,3351 55416 MOONMX # LP=LM FOR MOON RADIANS B0
053122,000057: 26,3352 77775 VLOAD
053123,000058: 26,3353 02012 504LM
053124,000059: 26,3354 53235 RPTORB VXV VAD
053125,000060: 26,3355 00001 504RPR
053126,000061: 26,3356 00001 504RPR
053127,000062: 26,3357 52105 VXM GOTO
053128,000063: 26,3360 00025 MMATRIX # MPAC=R=MT(T)*(RP+LPXRP)
053129,000064: 26,3361 55406 RPRPXXXX # RESET PUSHLOC TO 0 BEFORE EXITING
053130,000065: 26,3362 77624 RPTORA CALL # EARTH COMPUTATIONS
053131,000066: 26,3363 55567 EARTHMX # M MATRIX B-1
053132,000067: # AND L VECTOR RADIANS B0
053133,000068: 26,3364 76521 MXV VSL1 # LP=M(T)*L RAD B-0
053134,000069: 26,3365 00025 MMATRIX
053135,000070: 26,3366 77650 GOTO
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Page 1244
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053137,000072: 26,3367 55354 RPTORB
053138,000073:
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Page 1245
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053140,000075: # ..... R-TO-RP SUBROUTINE .....
053141,000076: # SUBROUTINE TO CONVERT R (VECTOR IN REFERENCE COORD. SYSTEM) TO RP
053142,000077: # (VECTOR IN PLANETARY COORD SYSTEM) EITHER EARTH-FIXED OR MOON-FIXED
053143,000078:
053144,000079: # RP = M(T) * (R - L X R)
053145,000080:
053146,000081: # CALLING SEQUENCE
053147,000082: # L CALL
053148,000083: # L+1 R-TO-RP
053149,000084:
053150,000085: # SUBROUTINES USED
053151,000086: # EARTHMX, MOONMX, EARTHL
053152,000087:
053153,000088: # INPUT
053154,000089: # MPAC = 0 FOR EARTH, NON-ZERO FOR MOON
053155,000090: # 0-5D = R VECTOR
053156,000091: # 6-7D = TIME
053157,000092:
053158,000093: # ITEMS AVAILABLE FROM LAUNCH DATA
053159,000094: # 504LM = THE LIBRATION VECTOR L OF THE MOON AT TIME TIMSUBL, EXPRESSED
053160,000095: # IN THE MOON-FIXED COORD. SYSTEM RADIANS B0
053161,000096:
053162,000097: # ITEMS NECESSARY FOR SUBROUTINES USED (SEE DESCRIPTION OF SUBR.)
053163,000098:
053164,000099: # OUTPUT
053165,000100: # MPAC = RP VECTOR METERS B-29 FOR EARTH, B-27 FOR MOON
053166,000101:
053167,000102: 26,3370 46020 R-TO-RP STQ BHIZ
053168,000103: 26,3371 00050 RPREXIT
053169,000104: 26,3372 55412 RTORPA
053170,000105: 26,3373 77624 CALL
053171,000106: 26,3374 55416 MOONMX
053172,000107: 26,3375 61375 VLOAD VXM
053173,000108: 26,3376 02012 504LM # LP=LM
053174,000109: 26,3377 00025 MMATRIX
053175,000110: 26,3400 77772 VSL1 # L = MT(T)*LP RADIANS B0
053176,000111: 26,3401 51235 RTORPB VXV BVSU
053177,000112: 26,3402 00001 504RPR
053178,000113: 26,3403 00001 504RPR
053179,000114: 26,3404 77721 MXV # M(T)*(R-LXR) B-2
053180,000115: 26,3405 00025 MMATRIX
053181,000116: 26,3406 40372 RPRPXXXX VSL1 SETPD
053182,000117: 26,3407 00001 0D
053183,000118: 26,3410 77650 GOTO
053184,000119: 26,3411 00050 RPREXIT
053185,000120: 26,3412 77624 RTORPA CALL # EARTH COMPUTATIONS
053186,000121: 26,3413 55567 EARTHMX
053187,000122: 26,3414 77650 GOTO # MPAC=L=(-AX,-AY,0) RAD B-0
053188,000123: 26,3415 55401 RTORPB
053189,000124:
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Page 1246
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053191,000126: # ..... MOONMX SUBROUTINE .....
053192,000127: # SUBROUTINE TO COMPUTE THE TRANSFORMATION MATRIX M FOR THE MOON
053193,000128:
053194,000129: # CALLING SEQUENCE
053195,000130: # L CALL
053196,000131: # L+1 MOONMX
053197,000132:
053198,000133: # SUBROUTINES USED
053199,000134: # NEWANGLE
053200,000135:
053201,000136: # INPUT
053202,000137: # 6-7D = TIME
053203,000138:
053204,000139: # ITEMS AVAILABLE FROM LAUNCH DATA
053205,000140: # BSUBO, BDOT
053206,000141: # TIMSUBO, NODIO, NODDOT, FSUBO, FDOT
053207,000142: # COSI = COS(I) B-1
053208,000143: # SINI = SIN(I) B-1
053209,000144: # I IS THE ANGLE BETWEEN THE MEAN LUNAR EQUATORIAL PLANE AND THE
053210,000145: # PLANE OF THE ECLIPTIC (1 DEGREE 32.1 MINUTES)
053211,000146:
053212,000147: # OUTPUT
053213,000148: # MMATRIX = 3X3 M MATRIX B-1 (STORED IN VAC AREA)
053214,000149:
053215,000150: 26,3416 40220 MOONMX STQ SETPD
053216,000151: 26,3417 00051 EARTHMXX
053217,000152: 26,3420 00011 8D
053218,000153: 26,3421 77770 AXT,1 # B REQUIRES SL 0, SL 5 IN NEWANGLE
053219,000154: 26,3422 00005 5
053220,000155: 26,3423 65345 DLOAD PDDL # PD 10D 8-9D=BSUBO
053221,000156: 26,3424 15647 BSUBO # 10-11D=BDOT
053222,000157: 26,3425 15641 BDOT
053223,000158: 26,3426 45006 PUSH CALL # PD 12D
053224,000159: 26,3427 55543 NEWANGLE # EXIT WITH PD 8D AND MPAC= B REVS B0
053225,000160: 26,3430 71406 PUSH COS # PD 10D
053226,000161: 26,3431 14041 STODL COB # PD 8D COS(B) B-1
053227,000162: 26,3432 77756 SIN # SIN(B) B-1
053228,000163: 26,3433 14043 STODL SOB # SETUP INPUT FOR NEWANGLE
053229,000164: 26,3434 15645 FSUBO # 8-9D=FSUBO
053230,000165: 26,3435 41525 PDDL PUSH # PD 10D THEN 12D 10-11D=FDOT
053231,000166: 26,3436 15637 FDOT
053232,000167: 26,3437 45170 AXT,1 CALL # F REQUIRES SL 1, SL 6 IN NEWANGLE
053233,000168: 26,3440 00004 4
053234,000169: 26,3441 55543 NEWANGLE # EXIT WITH PD 8D AND MPAC= F REVS B0
053235,000170: 26,3442 14027 STODL AVECTR +2 # SAVE F TEMP
053236,000171: 26,3443 15643 NODIO # 8-9D=NODIO
053237,000172: 26,3444 41525 PDDL PUSH # PD 10D THEN 12D 10-11D=NODDOT
053238,000173: 26,3445 15635 NODDOT # MPAC=T
053239,000174: 26,3446 45170 AXT,1 CALL # NODE REQUIRES SL 0, SL 5 IN NEWANGLE
053240,000175: 26,3447 00005 5
053241,000176: 26,3450 55543 NEWANGLE # EXIT WITH PD 8D AND MPAC= NODI REVS B0
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Page 1247
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053243,000178: 26,3451 71406 PUSH COS # PD 10D 8-9D= NODI REVS B0
053244,000179: 26,3452 77606 PUSH # PD 12D 10-11D= COS(NODI) B-1
053245,000180: 26,3453 00025 STORE AVECTR
053246,000181: 26,3454 76405 DMP SL1R
053247,000182: 26,3455 00041 COB # COS(NODI) B-1
053248,000183: 26,3456 14035 STODL BVECTR +2 # PD 10D 20-25D=AVECTR= COB*SIN(NODI)
053249,000184: 26,3457 76405 DMP SL1R # SOB*SIN(NODI)
053250,000185: 26,3460 00043 SOB
053251,000186: 26,3461 14037 STODL BVECTR +4 # PD 8D
053252,000187: 26,3462 41556 SIN PUSH # PD 10D -SIN(NODI) B-1
053253,000188: 26,3463 77676 DCOMP # 26-31D=BVECTR= COB*COS(NODI)
053254,000189: 26,3464 14033 STODL BVECTR # PD 8D SOB*COS(NODI)
053255,000190: 26,3465 00027 AVECTR +2 # MOVE F FROM TEMP LOC. TO 504F
053256,000191: 26,3466 14007 STODL 504F
053257,000192: 26,3467 76405 DMP SL1R
053258,000193: 26,3470 00041 COB
053259,000194: 26,3471 14027 STODL AVECTR +2
053260,000195: 26,3472 00011 SINNODI # 8-9D=SIN(NODI) B-1
053261,000196: 26,3473 76405 DMP SL1R
053262,000197: 26,3474 00043 SOB
053263,000198: 26,3475 14031 STODL AVECTR +4 # 0
053264,000199: 26,3476 15336 HI6ZEROS # 8-13D= CVECTR= -SOB B-1
053265,000200: 26,3477 57525 PDDL DCOMP # PD 10D COB
053266,000201: 26,3500 00043 SOB
053267,000202: 26,3501 63325 PDDL PDVL # PD 12D THEN PD 14D
053268,000203: 26,3502 00041 COB
053269,000204: 26,3503 00033 BVECTR
053270,000205: 26,3504 63361 VXSC PDVL # PD 20D BVECTR*SINI B-2
053271,000206: 26,3505 15633 SINI
053272,000207: 26,3506 00011 CVECTR
053273,000208: 26,3507 53361 VXSC VAD # PD 14D CVECTR*COSI B-2
053274,000209: 26,3510 15631 COSI
053275,000210: 26,3511 77772 VSL1
053276,000211: 26,3512 24041 STOVL MMATRIX +12D # PD 8D M2=BVECTR*SINI+CVECTR*COSI B-1
053277,000212: 26,3513 63361 VXSC PDVL # PD 14D
053278,000213: 26,3514 15633 SINI # CVECTR*SINI B-2
053279,000214: 26,3515 00033 BVECTR
053280,000215: 26,3516 52361 VXSC VSU # PD 8D BVECTR*COSI B-2
053281,000216: 26,3517 15631 COSI
053282,000217: 26,3520 65372 VSL1 PDDL # PD 14D
053283,000218: 26,3521 00007 504F # 8-13D=DVECTR=BVECTR*COSI-CVECTR*SINI B-1
053284,000219: 26,3522 74346 COS VXSC
053285,000220: 26,3523 00011 DVECTR
053286,000221: 26,3524 73525 PDDL SIN # PD 20D 14-19D= DVECTR*COSF B-2
053287,000222: 26,3525 00007 504F
053288,000223: 26,3526 52361 VXSC VSU # PD 14D AVECTR*SINF B-2
053289,000224: 26,3527 00025 AVECTR
053290,000225: 26,3530 77772 VSL1
053291,000226: 26,3531 14033 STODL MMATRIX +6 # M1= AVECTR*SINF-DVECTR*COSF B-1
053292,000227: 26,3532 00007 504F
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Page 1248
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053294,000229: 26,3533 74356 SIN VXSC # PD 8D
053295,000230: 26,3534 71525 PDDL COS # PD 14D 8-13D=DVECTR*SINF B-2
053296,000231: 26,3535 00007 504F
053297,000232: 26,3536 53361 VXSC VAD # PD 8D AVECTR*COSF B-2
053298,000233: 26,3537 00025 AVECTR
053299,000234: 26,3540 57572 VSL1 VCOMP
053300,000235: 26,3541 34025 STCALL MMATRIX # M0= -(AVECTR*COSF+DVECTR*SINF) B-1
053301,000236: 26,3542 00051 EARTHMXX
053302,000237:
053303,000238: # COMPUTE X=X0+(XDOT)(T+T0)
053304,000239: # 8-9D= XO (REVS B-0), PUSHLOC SET AT 12D
053305,000240: # 10-11D=XDOT (REVS/CSEC) SCALED B+23 FOR WEARTH,B+28 FOR NODDOT AND BDOT
053306,000241: # AND B+27 FOR FDOT
053307,000242: # X1=DIFFERENCE IN 23 AND SCALING OF XDOT, =0 FOR WEARTH, 5 FOR NODDOT AND
053308,000243: # BDOT AND 4 FOR FDOT
053309,000244: # 6-7D=T (CSEC B-28), TIMSUBO= (CSEC B-42 TRIPLE PREC.)
053310,000245:
053311,000246: 26,3543 54345 NEWANGLE DLOAD SR # ENTER PD 12D
053312,000247: 26,3544 00007 6D
053313,000248: 26,3545 20617 14D
053314,000249: 26,3546 72371 TAD TLOAD # CHANGE MODE TO TP
053315,000250: 26,3547 01707 TIMSUBO
053316,000251: 26,3550 00155 MPAC
053317,000252: 26,3551 14017 STODL TIMSUBM # T+T0 CSEC B-42
053318,000253: 26,3552 00020 TIMSUBM +1
053319,000254: 26,3553 77605 DMP # PD 10D MULT BY XDOT IN 10-11D
053320,000255: 26,3554 43257 SL* DAD # PD 8D ADD XO IN 8-9D AFTER SHIFTING
053321,000256: 26,3555 20206 5,1 # SUCH THAT SCALING IS B-0
053322,000257: 26,3556 67206 PUSH SLOAD # PD 10D SAVE PARTIAL (X0+XDOT*T) IN 8-9D
053323,000258: 26,3557 00017 TIMSUBM
053324,000259: 26,3560 41261 SL DMP
053325,000260: 26,3561 20212 9D
053326,000261: 26,3562 00013 10D # XDOT
053327,000262: 26,3563 43257 SL* DAD # PD 8D SHIFT SUCH THAT THIS PART OF X
053328,000263: 26,3564 20213 10D,1 # IS SCALED REVS/CSEC B-0
053329,000264: 26,3565 43400 HERE BOV RVQ # TURN OFF OVERFLOW IF SET BY SHIFT
053330,000265: 26,3566 55565 HERE # INSTRUCTION BEFORE EXITING
053331,000266: # MPAC=X=X0+(XDOT)(T+T0) REVS B0
053332,000267:
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Page 1249
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053334,000269: # ..... EARTHMX SUBROUTINE .....
053335,000270: # SUBROUTINE TO COMPUTE THE TRANSFORMATION MATRIX M FOR THE EARTH
053336,000271:
053337,000272: # CALLING SEQUENCE
053338,000273: # L CALL
053339,000274: # L+1 EARTHMX
053340,000275:
053341,000276: # SUBROUTINES USED
053342,000277: # NEWANGLE
053343,000278:
053344,000279: # INPUT
053345,000280: # INPUT AVAILABLE FROM LAUNCH DATA AZO REVS B-0
053346,000281: # TEPHEM CSEC B-42
053347,000282: # 6-7D= TIME CSEC B-28
053348,000283:
053349,000284: # OUTPUT
053350,000285: # MMATRIX= 3X3 M MATRIX B-1 (STORED IN VAC AREA)
053351,000286:
053352,000287: 26,3567 40220 EARTHMX STQ SETPD # SET 8-9D=AZO
053353,000288: 26,3570 00051 EARTHMXX
053354,000289: 26,3571 00011 8D # 10-11D=WEARTH
053355,000290: 26,3572 77770 AXT,1 # FOR SL 5, AND SL 10 IN NEWANGLE
053356,000291: 26,3573 00000 0
053357,000292: 26,3574 65345 DLOAD PDDL # LEAVING PD SET AT 12D FOR NEWANGLE
053358,000293: 26,3575 15653 AZO
053359,000294: 26,3576 15651 WEARTH
053360,000295: 26,3577 45006 PUSH CALL
053361,000296: 26,3600 55543 NEWANGLE
053362,000297: 26,3601 41401 SETPD PUSH # 18-19D=504AZ
053363,000298: 26,3602 00023 18D # COS(AZ) SIN(AZ) 0
053364,000299: 26,3603 65346 COS PDDL # 20-37D= MMATRIX= -SIN(AZ) COS(AZ) 0 B-1
053365,000300: 26,3604 00023 504AZ # 0 0 1
053366,000301: 26,3605 65356 SIN PDDL
053367,000302: 26,3606 15336 HI6ZEROS
053368,000303: 26,3607 73525 PDDL SIN
053369,000304: 26,3610 00023 504AZ
053370,000305: 26,3611 65276 DCOMP PDDL
053371,000306: 26,3612 00023 504AZ
053372,000307: 26,3613 63346 COS PDVL
053373,000308: 26,3614 15336 HI6ZEROS
053374,000309: 26,3615 41525 PDDL PUSH
053375,000310: 26,3616 15334 HIDPHALF
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Page 1250
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053377,000312: # ..... EARTHL SUBROUTINE .....
053378,000313: # SUBROUTINE TO COMPUTE L VECTOR FOR EARTH
053379,000314:
053380,000315: # CALLING SEQUENCE
053381,000316: # L CALL
053382,000317: # L+1 EARTHL
053383,000318:
053384,000319: # INPUT
053385,000320: # AXO,AYO SET AT LAUNCH TIME WITH AYO IMMEDIATELY FOLLOWING AXO IN CORE
053386,000321:
053387,000322: # OUTPUT
053388,000323: # -AX
053389,000324: # MPAC= -AY RADIANS B-0
053390,000325: # 0
053391,000326:
053392,000327: 26,3617 71201 EARTHL SETPD DLOAD
053393,000328: 26,3620 00017 14D
053394,000329: 26,3621 15336 HI6ZEROS
053395,000330: 26,3622 65325 PDDL PDDL
053396,000331: 26,3623 01712 -AYO
053397,000332: 26,3624 01714 AXO
053398,000333: 26,3625 55476 DCOMP VDEF
053399,000334: 26,3626 77650 GOTO
053400,000335: 26,3627 00051 EARTHMXX
053401,000336:
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Page 1251
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053403,000338: # CONSTANTS AND ERASABLE ASSIGNMENTS
053404,000339:
053405,000340: 26,3630 04,3757 1B1 = DP1/2 # 1 SCALED B-1
053406,000341: 26,3630 17775 02052 COSI 2DEC* 9.996417320 E-1 B-1* # COS(5521.5 SEC.)
053407,000342: 26,3632 00333 10374 SINI 2DEC* 2.676579050 E-2 B-1* # SIN(5521.5 SEC.)
053408,000343: 26,3634 0000050 RPREXIT = S1 # R-TO-RP AND RP-TO-R SUBR EXIT
053409,000344: 26,3634 0000051 EARTHMXX = S2 # EARTHMX,MOONMX SUBR. EXITS
053410,000345: 26,3634 504RPR = 0D # 6 REGS R OR RP VECTOR
053411,000346: 26,3634 SINNODI = 8D # 2 SIN(NODI)
053412,000347: 26,3634 DVECTR = 8D # 6 D VECTOR MOON
053413,000348: 26,3634 CVECTR = 8D # 6 C VECTR MOON
053414,000349: 26,3634 504AZ = 18D # 2 AZ
053415,000350: 26,3634 TIMSUBM = 14D # 3 TIME SUB M (MOON) T+T0 IN GETAZ
053416,000351: 26,3634 504LPL = 14D # 6 L OR LP VECTOR
053417,000352: 26,3634 AVECTR = 20D # 6 A VECTOR (MOON)
053418,000353: 26,3634 BVECTR = 26D # 6 B VECTOR (MOON)
053419,000354: 26,3634 MMATRIX = 20D # 18 M MATRIX
053420,000355: 26,3634 COB = 32D # 2 COS(B) B-1
053421,000356: 26,3634 SOB = 34D # 2 SIN(B) B-1
053422,000357: 26,3634 504F = 6D # 2 F (MOON)
053423,000358: 26,3634 77665 42175 NODDOT 2DEC* -1.703706128 E-11 B28* # REVS/CS.
053424,000359: 26,3636 22211 00636 FDOT 2DEC* +4.253263471 E-9 B27* # REVS/CS.
053425,000360: 26,3640 77777 77767 BDOT 2DEC* -1.145531390 E-16 B28* # REVS/CS.
053426,000361: 26,3642 34076 30363 NODIO 2DEC* +8.788308600 E-1 B # REV.
053427,000362: 26,3644 24760 00133 FSUBO 2DEC* +6.552737750 E-1 B # REV.
053428,000363: 26,3646 02052 35250 BSUBO 2DEC* +6.511941688 E-2 B # REV.
053429,000364: 26,3650 37116 32631 WEARTH 2DEC* +1.160576171 E-7 B23* # REV/CS.
053430,000365: 26,3652 30576 10326 AZO 2DEC* +7.733314844 E-1 B # REVS.
End of include-file PLANETARY_INERTIAL_ORIENTATION.agc. Parent file is MAIN.agc