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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053077,000002: ## Copyright: Public domain.
053078,000003: ## Filename: PLANETARY_INERTIAL_ORIENTATION.agc
053079,000004: ## Purpose: A section of Artemis revision 071.
053080,000005: ## It is part of the reconstructed source code for the first
053081,000006: ## release of the flight software for the Command Module's
053082,000007: ## (CM) Apollo Guidance Computer (AGC) for Apollo 15 through
053083,000008: ## 17. The code has been recreated from a copy of Artemis 072.
053084,000009: ## It has been adapted such that the resulting bugger words
053085,000010: ## exactly match those specified for Artemis 071 in NASA
053086,000011: ## drawing 2021154-, which gives relatively high confidence
053087,000012: ## that the reconstruction is correct.
053088,000013: ## Reference: 1243
053089,000014: ## Assembler: yaYUL
053090,000015: ## Contact: Ron Burkey <info@sandroid.org>.
053091,000016: ## Website: www.ibiblio.org/apollo/index.html
053092,000017: ## Mod history: 2019-08-14 MAS Created from Artemis 072.
053093,000018:
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Page 1243
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053095,000020: # ..... RP-TO-R SUBROUTINE .....
053096,000021: # SUBROUTINE TO CONVERT RP (VECTOR IN PLANETARY COORDINATE SYSTEM, EITHER
053097,000022: # EARTH-FIXED OR MOON-FIXED) TO R (SAME VECTOR IN THE BASIC REF. SYSTEM)
053098,000023:
053099,000024: # R = MT(T) * (RP + LP X RP) MT = M MATRIX TRANSPOSE
053100,000025:
053101,000026: # CALLING SEQUENCE
053102,000027: # L CALL
053103,000028: # L+1 RP-TO-R
053104,000029:
053105,000030: # SUBROUTINES USED
053106,000031: # EARTHMX, MOONMX, EARTHL
053107,000032:
053108,000033: # ITEMS AVAILABLE FROM LAUNCH DATA
053109,000034: # 504LM = THE LIBRATION VECTOR L OF THE MOON AT TIME TIMSUBL, EXPRESSED
053110,000035: # IN THE MOON-FIXED COORD. SYSTEM RADIANS B0
053111,000036:
053112,000037: # ITEMS NECESSARY FOR SUBR. USED (SEE DESCRIPTION OF SUBR.)
053113,000038:
053114,000039: # INPUT
053115,000040: # MPAC = 0 FOR EARTH, NON-ZERO FOR MOON
053116,000041: # 0-5D = RP VECTOR
053117,000042: # 6-7D = TIME
053118,000043:
053119,000044: # OUTPUT
053120,000045: # MPAC = R VECTOR METERS B-29 FOR EARTH, B-27 FOR MOON
053121,000046:
053122,000047: 26,2000 SETLOC PLANTIN
053123,000048: 26,2000 BANK
053124,000049:
053125,000050: 26,3345 COUNT* $$/LUROT
053126,000051:
053127,000052: 26,3345 46020 RP-TO-R STQ BHIZ
053128,000053: 26,3346 00050 RPREXIT
053129,000054: 26,3347 55362 RPTORA
053130,000055: 26,3350 77624 CALL # COMPUTE M MATRIX FOR MOON
053131,000056: 26,3351 55416 MOONMX # LP=LM FOR MOON RADIANS B0
053132,000057: 26,3352 77775 VLOAD
053133,000058: 26,3353 02012 504LM
053134,000059: 26,3354 53235 RPTORB VXV VAD
053135,000060: 26,3355 00001 504RPR
053136,000061: 26,3356 00001 504RPR
053137,000062: 26,3357 52105 VXM GOTO
053138,000063: 26,3360 00025 MMATRIX # MPAC=R=MT(T)*(RP+LPXRP)
053139,000064: 26,3361 55406 RPRPXXXX # RESET PUSHLOC TO 0 BEFORE EXITING
053140,000065: 26,3362 77624 RPTORA CALL # EARTH COMPUTATIONS
053141,000066: 26,3363 55567 EARTHMX # M MATRIX B-1
053142,000067: # AND L VECTOR RADIANS B0
053143,000068: 26,3364 76521 MXV VSL1 # LP=M(T)*L RAD B-0
053144,000069: 26,3365 00025 MMATRIX
053145,000070: 26,3366 77650 GOTO
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Page 1244
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053147,000072: 26,3367 55354 RPTORB
053148,000073:
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Page 1245
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053150,000075: # ..... R-TO-RP SUBROUTINE .....
053151,000076: # SUBROUTINE TO CONVERT R (VECTOR IN REFERENCE COORD. SYSTEM) TO RP
053152,000077: # (VECTOR IN PLANETARY COORD SYSTEM) EITHER EARTH-FIXED OR MOON-FIXED
053153,000078:
053154,000079: # RP = M(T) * (R - L X R)
053155,000080:
053156,000081: # CALLING SEQUENCE
053157,000082: # L CALL
053158,000083: # L+1 R-TO-RP
053159,000084:
053160,000085: # SUBROUTINES USED
053161,000086: # EARTHMX, MOONMX, EARTHL
053162,000087:
053163,000088: # INPUT
053164,000089: # MPAC = 0 FOR EARTH, NON-ZERO FOR MOON
053165,000090: # 0-5D = R VECTOR
053166,000091: # 6-7D = TIME
053167,000092:
053168,000093: # ITEMS AVAILABLE FROM LAUNCH DATA
053169,000094: # 504LM = THE LIBRATION VECTOR L OF THE MOON AT TIME TIMSUBL, EXPRESSED
053170,000095: # IN THE MOON-FIXED COORD. SYSTEM RADIANS B0
053171,000096:
053172,000097: # ITEMS NECESSARY FOR SUBROUTINES USED (SEE DESCRIPTION OF SUBR.)
053173,000098:
053174,000099: # OUTPUT
053175,000100: # MPAC = RP VECTOR METERS B-29 FOR EARTH, B-27 FOR MOON
053176,000101:
053177,000102: 26,3370 46020 R-TO-RP STQ BHIZ
053178,000103: 26,3371 00050 RPREXIT
053179,000104: 26,3372 55412 RTORPA
053180,000105: 26,3373 77624 CALL
053181,000106: 26,3374 55416 MOONMX
053182,000107: 26,3375 61375 VLOAD VXM
053183,000108: 26,3376 02012 504LM # LP=LM
053184,000109: 26,3377 00025 MMATRIX
053185,000110: 26,3400 77772 VSL1 # L = MT(T)*LP RADIANS B0
053186,000111: 26,3401 51235 RTORPB VXV BVSU
053187,000112: 26,3402 00001 504RPR
053188,000113: 26,3403 00001 504RPR
053189,000114: 26,3404 77721 MXV # M(T)*(R-LXR) B-2
053190,000115: 26,3405 00025 MMATRIX
053191,000116: 26,3406 40372 RPRPXXXX VSL1 SETPD
053192,000117: 26,3407 00001 0D
053193,000118: 26,3410 77650 GOTO
053194,000119: 26,3411 00050 RPREXIT
053195,000120: 26,3412 77624 RTORPA CALL # EARTH COMPUTATIONS
053196,000121: 26,3413 55567 EARTHMX
053197,000122: 26,3414 77650 GOTO # MPAC=L=(-AX,-AY,0) RAD B-0
053198,000123: 26,3415 55401 RTORPB
053199,000124:
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Page 1246
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053201,000126: # ..... MOONMX SUBROUTINE .....
053202,000127: # SUBROUTINE TO COMPUTE THE TRANSFORMATION MATRIX M FOR THE MOON
053203,000128:
053204,000129: # CALLING SEQUENCE
053205,000130: # L CALL
053206,000131: # L+1 MOONMX
053207,000132:
053208,000133: # SUBROUTINES USED
053209,000134: # NEWANGLE
053210,000135:
053211,000136: # INPUT
053212,000137: # 6-7D = TIME
053213,000138:
053214,000139: # ITEMS AVAILABLE FROM LAUNCH DATA
053215,000140: # BSUBO, BDOT
053216,000141: # TIMSUBO, NODIO, NODDOT, FSUBO, FDOT
053217,000142: # COSI = COS(I) B-1
053218,000143: # SINI = SIN(I) B-1
053219,000144: # I IS THE ANGLE BETWEEN THE MEAN LUNAR EQUATORIAL PLANE AND THE
053220,000145: # PLANE OF THE ECLIPTIC (1 DEGREE 32.1 MINUTES)
053221,000146:
053222,000147: # OUTPUT
053223,000148: # MMATRIX = 3X3 M MATRIX B-1 (STORED IN VAC AREA)
053224,000149:
053225,000150: 26,3416 40220 MOONMX STQ SETPD
053226,000151: 26,3417 00051 EARTHMXX
053227,000152: 26,3420 00011 8D
053228,000153: 26,3421 77770 AXT,1 # B REQUIRES SL 0, SL 5 IN NEWANGLE
053229,000154: 26,3422 00005 5
053230,000155: 26,3423 65345 DLOAD PDDL # PD 10D 8-9D=BSUBO
053231,000156: 26,3424 15647 BSUBO # 10-11D=BDOT
053232,000157: 26,3425 15641 BDOT
053233,000158: 26,3426 45006 PUSH CALL # PD 12D
053234,000159: 26,3427 55543 NEWANGLE # EXIT WITH PD 8D AND MPAC= B REVS B0
053235,000160: 26,3430 71406 PUSH COS # PD 10D
053236,000161: 26,3431 14041 STODL COB # PD 8D COS(B) B-1
053237,000162: 26,3432 77756 SIN # SIN(B) B-1
053238,000163: 26,3433 14043 STODL SOB # SETUP INPUT FOR NEWANGLE
053239,000164: 26,3434 15645 FSUBO # 8-9D=FSUBO
053240,000165: 26,3435 41525 PDDL PUSH # PD 10D THEN 12D 10-11D=FDOT
053241,000166: 26,3436 15637 FDOT
053242,000167: 26,3437 45170 AXT,1 CALL # F REQUIRES SL 1, SL 6 IN NEWANGLE
053243,000168: 26,3440 00004 4
053244,000169: 26,3441 55543 NEWANGLE # EXIT WITH PD 8D AND MPAC= F REVS B0
053245,000170: 26,3442 14027 STODL AVECTR +2 # SAVE F TEMP
053246,000171: 26,3443 15643 NODIO # 8-9D=NODIO
053247,000172: 26,3444 41525 PDDL PUSH # PD 10D THEN 12D 10-11D=NODDOT
053248,000173: 26,3445 15635 NODDOT # MPAC=T
053249,000174: 26,3446 45170 AXT,1 CALL # NODE REQUIRES SL 0, SL 5 IN NEWANGLE
053250,000175: 26,3447 00005 5
053251,000176: 26,3450 55543 NEWANGLE # EXIT WITH PD 8D AND MPAC= NODI REVS B0
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Page 1247
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053253,000178: 26,3451 71406 PUSH COS # PD 10D 8-9D= NODI REVS B0
053254,000179: 26,3452 77606 PUSH # PD 12D 10-11D= COS(NODI) B-1
053255,000180: 26,3453 00025 STORE AVECTR
053256,000181: 26,3454 76405 DMP SL1R
053257,000182: 26,3455 00041 COB # COS(NODI) B-1
053258,000183: 26,3456 14035 STODL BVECTR +2 # PD 10D 20-25D=AVECTR= COB*SIN(NODI)
053259,000184: 26,3457 76405 DMP SL1R # SOB*SIN(NODI)
053260,000185: 26,3460 00043 SOB
053261,000186: 26,3461 14037 STODL BVECTR +4 # PD 8D
053262,000187: 26,3462 41556 SIN PUSH # PD 10D -SIN(NODI) B-1
053263,000188: 26,3463 77676 DCOMP # 26-31D=BVECTR= COB*COS(NODI)
053264,000189: 26,3464 14033 STODL BVECTR # PD 8D SOB*COS(NODI)
053265,000190: 26,3465 00027 AVECTR +2 # MOVE F FROM TEMP LOC. TO 504F
053266,000191: 26,3466 14007 STODL 504F
053267,000192: 26,3467 76405 DMP SL1R
053268,000193: 26,3470 00041 COB
053269,000194: 26,3471 14027 STODL AVECTR +2
053270,000195: 26,3472 00011 SINNODI # 8-9D=SIN(NODI) B-1
053271,000196: 26,3473 76405 DMP SL1R
053272,000197: 26,3474 00043 SOB
053273,000198: 26,3475 14031 STODL AVECTR +4 # 0
053274,000199: 26,3476 15336 HI6ZEROS # 8-13D= CVECTR= -SOB B-1
053275,000200: 26,3477 57525 PDDL DCOMP # PD 10D COB
053276,000201: 26,3500 00043 SOB
053277,000202: 26,3501 63325 PDDL PDVL # PD 12D THEN PD 14D
053278,000203: 26,3502 00041 COB
053279,000204: 26,3503 00033 BVECTR
053280,000205: 26,3504 63361 VXSC PDVL # PD 20D BVECTR*SINI B-2
053281,000206: 26,3505 15633 SINI
053282,000207: 26,3506 00011 CVECTR
053283,000208: 26,3507 53361 VXSC VAD # PD 14D CVECTR*COSI B-2
053284,000209: 26,3510 15631 COSI
053285,000210: 26,3511 77772 VSL1
053286,000211: 26,3512 24041 STOVL MMATRIX +12D # PD 8D M2=BVECTR*SINI+CVECTR*COSI B-1
053287,000212: 26,3513 63361 VXSC PDVL # PD 14D
053288,000213: 26,3514 15633 SINI # CVECTR*SINI B-2
053289,000214: 26,3515 00033 BVECTR
053290,000215: 26,3516 52361 VXSC VSU # PD 8D BVECTR*COSI B-2
053291,000216: 26,3517 15631 COSI
053292,000217: 26,3520 65372 VSL1 PDDL # PD 14D
053293,000218: 26,3521 00007 504F # 8-13D=DVECTR=BVECTR*COSI-CVECTR*SINI B-1
053294,000219: 26,3522 74346 COS VXSC
053295,000220: 26,3523 00011 DVECTR
053296,000221: 26,3524 73525 PDDL SIN # PD 20D 14-19D= DVECTR*COSF B-2
053297,000222: 26,3525 00007 504F
053298,000223: 26,3526 52361 VXSC VSU # PD 14D AVECTR*SINF B-2
053299,000224: 26,3527 00025 AVECTR
053300,000225: 26,3530 77772 VSL1
053301,000226: 26,3531 14033 STODL MMATRIX +6 # M1= AVECTR*SINF-DVECTR*COSF B-1
053302,000227: 26,3532 00007 504F
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Page 1248
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053304,000229: 26,3533 74356 SIN VXSC # PD 8D
053305,000230: 26,3534 71525 PDDL COS # PD 14D 8-13D=DVECTR*SINF B-2
053306,000231: 26,3535 00007 504F
053307,000232: 26,3536 53361 VXSC VAD # PD 8D AVECTR*COSF B-2
053308,000233: 26,3537 00025 AVECTR
053309,000234: 26,3540 57572 VSL1 VCOMP
053310,000235: 26,3541 34025 STCALL MMATRIX # M0= -(AVECTR*COSF+DVECTR*SINF) B-1
053311,000236: 26,3542 00051 EARTHMXX
053312,000237:
053313,000238: # COMPUTE X=X0+(XDOT)(T+T0)
053314,000239: # 8-9D= XO (REVS B-0), PUSHLOC SET AT 12D
053315,000240: # 10-11D=XDOT (REVS/CSEC) SCALED B+23 FOR WEARTH,B+28 FOR NODDOT AND BDOT
053316,000241: # AND B+27 FOR FDOT
053317,000242: # X1=DIFFERENCE IN 23 AND SCALING OF XDOT, =0 FOR WEARTH, 5 FOR NODDOT AND
053318,000243: # BDOT AND 4 FOR FDOT
053319,000244: # 6-7D=T (CSEC B-28), TIMSUBO= (CSEC B-42 TRIPLE PREC.)
053320,000245:
053321,000246: 26,3543 54345 NEWANGLE DLOAD SR # ENTER PD 12D
053322,000247: 26,3544 00007 6D
053323,000248: 26,3545 20617 14D
053324,000249: 26,3546 72371 TAD TLOAD # CHANGE MODE TO TP
053325,000250: 26,3547 01707 TIMSUBO
053326,000251: 26,3550 00155 MPAC
053327,000252: 26,3551 14017 STODL TIMSUBM # T+T0 CSEC B-42
053328,000253: 26,3552 00020 TIMSUBM +1
053329,000254: 26,3553 77605 DMP # PD 10D MULT BY XDOT IN 10-11D
053330,000255: 26,3554 43257 SL* DAD # PD 8D ADD XO IN 8-9D AFTER SHIFTING
053331,000256: 26,3555 20206 5,1 # SUCH THAT SCALING IS B-0
053332,000257: 26,3556 67206 PUSH SLOAD # PD 10D SAVE PARTIAL (X0+XDOT*T) IN 8-9D
053333,000258: 26,3557 00017 TIMSUBM
053334,000259: 26,3560 41261 SL DMP
053335,000260: 26,3561 20212 9D
053336,000261: 26,3562 00013 10D # XDOT
053337,000262: 26,3563 43257 SL* DAD # PD 8D SHIFT SUCH THAT THIS PART OF X
053338,000263: 26,3564 20213 10D,1 # IS SCALED REVS/CSEC B-0
053339,000264: 26,3565 43400 HERE BOV RVQ # TURN OFF OVERFLOW IF SET BY SHIFT
053340,000265: 26,3566 55565 HERE # INSTRUCTION BEFORE EXITING
053341,000266: # MPAC=X=X0+(XDOT)(T+T0) REVS B0
053342,000267:
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Page 1249
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053344,000269: # ..... EARTHMX SUBROUTINE .....
053345,000270: # SUBROUTINE TO COMPUTE THE TRANSFORMATION MATRIX M FOR THE EARTH
053346,000271:
053347,000272: # CALLING SEQUENCE
053348,000273: # L CALL
053349,000274: # L+1 EARTHMX
053350,000275:
053351,000276: # SUBROUTINES USED
053352,000277: # NEWANGLE
053353,000278:
053354,000279: # INPUT
053355,000280: # INPUT AVAILABLE FROM LAUNCH DATA AZO REVS B-0
053356,000281: # TEPHEM CSEC B-42
053357,000282: # 6-7D= TIME CSEC B-28
053358,000283:
053359,000284: # OUTPUT
053360,000285: # MMATRIX= 3X3 M MATRIX B-1 (STORED IN VAC AREA)
053361,000286:
053362,000287: 26,3567 40220 EARTHMX STQ SETPD # SET 8-9D=AZO
053363,000288: 26,3570 00051 EARTHMXX
053364,000289: 26,3571 00011 8D # 10-11D=WEARTH
053365,000290: 26,3572 77770 AXT,1 # FOR SL 5, AND SL 10 IN NEWANGLE
053366,000291: 26,3573 00000 0
053367,000292: 26,3574 65345 DLOAD PDDL # LEAVING PD SET AT 12D FOR NEWANGLE
053368,000293: 26,3575 15653 AZO
053369,000294: 26,3576 15651 WEARTH
053370,000295: 26,3577 45006 PUSH CALL
053371,000296: 26,3600 55543 NEWANGLE
053372,000297: 26,3601 41401 SETPD PUSH # 18-19D=504AZ
053373,000298: 26,3602 00023 18D # COS(AZ) SIN(AZ) 0
053374,000299: 26,3603 65346 COS PDDL # 20-37D= MMATRIX= -SIN(AZ) COS(AZ) 0 B-1
053375,000300: 26,3604 00023 504AZ # 0 0 1
053376,000301: 26,3605 65356 SIN PDDL
053377,000302: 26,3606 15336 HI6ZEROS
053378,000303: 26,3607 73525 PDDL SIN
053379,000304: 26,3610 00023 504AZ
053380,000305: 26,3611 65276 DCOMP PDDL
053381,000306: 26,3612 00023 504AZ
053382,000307: 26,3613 63346 COS PDVL
053383,000308: 26,3614 15336 HI6ZEROS
053384,000309: 26,3615 41525 PDDL PUSH
053385,000310: 26,3616 15334 HIDPHALF
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Page 1250
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053387,000312: # ..... EARTHL SUBROUTINE .....
053388,000313: # SUBROUTINE TO COMPUTE L VECTOR FOR EARTH
053389,000314:
053390,000315: # CALLING SEQUENCE
053391,000316: # L CALL
053392,000317: # L+1 EARTHL
053393,000318:
053394,000319: # INPUT
053395,000320: # AXO,AYO SET AT LAUNCH TIME WITH AYO IMMEDIATELY FOLLOWING AXO IN CORE
053396,000321:
053397,000322: # OUTPUT
053398,000323: # -AX
053399,000324: # MPAC= -AY RADIANS B-0
053400,000325: # 0
053401,000326:
053402,000327: 26,3617 71201 EARTHL SETPD DLOAD
053403,000328: 26,3620 00017 14D
053404,000329: 26,3621 15336 HI6ZEROS
053405,000330: 26,3622 65325 PDDL PDDL
053406,000331: 26,3623 01712 -AYO
053407,000332: 26,3624 01714 AXO
053408,000333: 26,3625 55476 DCOMP VDEF
053409,000334: 26,3626 77650 GOTO
053410,000335: 26,3627 00051 EARTHMXX
053411,000336:
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Page 1251
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053413,000338: # CONSTANTS AND ERASABLE ASSIGNMENTS
053414,000339:
053415,000340: 26,3630 04,3757 1B1 = DP1/2 # 1 SCALED B-1
053416,000341: 26,3630 17775 02052 COSI 2DEC* 9.996417320 E-1 B-1* # COS(5521.5 SEC.)
053417,000342: 26,3632 00333 10374 SINI 2DEC* 2.676579050 E-2 B-1* # SIN(5521.5 SEC.)
053418,000343: 26,3634 0000050 RPREXIT = S1 # R-TO-RP AND RP-TO-R SUBR EXIT
053419,000344: 26,3634 0000051 EARTHMXX = S2 # EARTHMX,MOONMX SUBR. EXITS
053420,000345: 26,3634 504RPR = 0D # 6 REGS R OR RP VECTOR
053421,000346: 26,3634 SINNODI = 8D # 2 SIN(NODI)
053422,000347: 26,3634 DVECTR = 8D # 6 D VECTOR MOON
053423,000348: 26,3634 CVECTR = 8D # 6 C VECTR MOON
053424,000349: 26,3634 504AZ = 18D # 2 AZ
053425,000350: 26,3634 TIMSUBM = 14D # 3 TIME SUB M (MOON) T+T0 IN GETAZ
053426,000351: 26,3634 504LPL = 14D # 6 L OR LP VECTOR
053427,000352: 26,3634 AVECTR = 20D # 6 A VECTOR (MOON)
053428,000353: 26,3634 BVECTR = 26D # 6 B VECTOR (MOON)
053429,000354: 26,3634 MMATRIX = 20D # 18 M MATRIX
053430,000355: 26,3634 COB = 32D # 2 COS(B) B-1
053431,000356: 26,3634 SOB = 34D # 2 SIN(B) B-1
053432,000357: 26,3634 504F = 6D # 2 F (MOON)
053433,000358: 26,3634 77665 42175 NODDOT 2DEC* -1.703706128 E-11 B28* # REVS/CS.
053434,000359: 26,3636 22211 00636 FDOT 2DEC* +4.253263471 E-9 B27* # REVS/CS.
053435,000360: 26,3640 77777 77767 BDOT 2DEC* -1.145531390 E-16 B28* # REVS/CS.
053436,000361: 26,3642 34076 30363 NODIO 2DEC* +8.788308600 E-1 B # REV.
053437,000362: 26,3644 24760 00133 FSUBO 2DEC* +6.552737750 E-1 B # REV.
053438,000363: 26,3646 02052 35250 BSUBO 2DEC* +6.511941688 E-2 B # REV.
053439,000364: 26,3650 37116 32631 WEARTH 2DEC* +1.160576171 E-7 B23* # REV/CS.
053440,000365: 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