Source Code

These source-code files derive from a printout of Luminary 210 (Apollo 15-17 Lunar Module guidance computer program), from the personal library of original AGC developer Don Eyles, digitally photographed at archive.org, financially sponsored by Jim Lawton, and transcribed to source code by a team of volunteers. This colorized, syntax-highlighted form was created by assembling that transcribed source code. Note that the full page images are available on the Virtual AGC project page at archive.org, while reduced-size images are presented at the VirtualAGC project website. Report or fix any transcription errors at the Virtual AGC project code repository.

Notations on the program listing read, in part:

	GAP: ASSEMBLE REVISION 210 OF AGC PROGRAM LUMINARY 
	BY NASA 2021112-161 17:11 MAR. 19,1971
Note that the date is the date of the printout, not the date of the program revision.

017213,000002:                                                                                                  ## Copyright:   Public domain.
017214,000003:                                                                                                  ## Filename:    IMU_PERFORMANCE_TESTS_4.agc
017215,000004:                                                                                                  ## Purpose:     A section of Luminary revision 210.
017216,000005:                                                                                                  ##              It is part of the source code for the Lunar Module's (LM)
017217,000006:                                                                                                  ##              Apollo Guidance Computer (AGC) for Apollo 15-17.
017218,000007:                                                                                                  ##              This file is intended to be a faithful transcription, except
017219,000008:                                                                                                  ##              that the code format has been changed to conform to the
017220,000009:                                                                                                  ##              requirements of the yaYUL assembler rather than the
017221,000010:                                                                                                  ##              original YUL assembler.
017222,000011:                                                                                                  ## Reference:   pp. 394-401
017223,000012:                                                                                                  ## Assembler:   yaYUL
017224,000013:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
017225,000014:                                                                                                  ## Website:     www.ibiblio.org/apollo/index.html
017226,000015:                                                                                                  ## Mod history: 2016-11-17 JL   Created from Luminary131 version.
017227,000016:                                                                                                  ##              2016-11-26 HG   Transcribed
017228,000017:                                                                                                  ##              2016-12-23 RSB  Proofed comment text with octopus/ProoferComments
017229,000018:                                                                                                  ##                              and fixed all errors found.
017230,000019:                                                                                                  ##              2017-03-07 RSB  Comment-text error-fixes noted in proofing Luminary 116.
017231,000020: 

Page 394

017233,000022:                                                                                                  #  PROGRAM- IMU PERFORMANCE TESTS 4
017234,000023:                                                                                                  #  DATE- NOV 15, 1966
017235,000024:                                                                                                  #  BY- GEORGE SCHMIDT IL7-146 EXT 1126
017236,000025:                                                                                                  #  MOD NO-ZERO
017237,000026: 
017238,000027: 
017239,000028:                                                                                                  #  FUNCTIONAL DESCRIPTION
017240,000029: 
017241,000030:                                                                                                  #  THIS SECTION CONSISTS OF THE FILTER FOR THE GYRO DRIFT TESTS. NO COMPASS
017242,000031:                                                                                                  #  IS DONE IN LEM. FOR A DESCRIPTION OF THE FILTER SEE E-1973.  THIS
017243,000032:                                                                                                  #  SECTION IS ENTERED FROM IMU 2. IT RETURNS THERE AT END OF TEST.
017244,000033: 
017245,000034:                                                                                                  #  EARTHR,OGC ZERO,ERTHRVSE
017246,000035: 
017247,000036:                                                                                                  #  NORMAL EXIT
017248,000037: 
017249,000038:                                                                                                  #  LENGTHOT GOES TO ZERO-RETURN TO IMU PERF TESTS 2 CONTROL
017250,000039: 
017251,000040:                                                                                                  #  ALARMS
017252,000041: 
017253,000042:                                                                                                  #  1600  OVERFLOW IN DRIFT TEST
017254,000043:                                                                                                  #  1601     BAD IMU MODING IN ANY ROUTINE THAT USES IMUSTALL
017255,000044:                                                                                                  #  OUTPUT
017256,000045: 
017257,000046:                                                                                                  #  FLASHING DISPLAY OF RESULTS-CONTROLLED IN IMU PERF TESTS 2
017258,000047: 
017259,000048:                                                                                                  #  DEBRIS
017260,000049: 
017261,000050:                                                                                                  #  ALL CENTRALS-ALL OF EBANK XSM
017262,000051: 

Page 395

017264,000053: 33,2113                                           BANK     33                                    
017265,000054: 37,2000                                           SETLOC   IMU4                                  
017266,000055: 37,2000                                           BANK                                           
017267,000056: 37,2500                                           COUNT*   $$/P07                                
017268,000057: 
017269,000058: 37,2500  E5,1642                                  EBANK=   XSM                                   
017270,000059: 
017271,000060: 
017272,000061: 37,2500           00004        ESTIMS             INHINT                                         
017273,000062: 37,2501           31572                           CAE      1SECXT                                
017274,000063: 37,2502           05175                           TC       TWIDDLE                               
017275,000064: 37,2503  E5,1642                                  EBANK=   XSM                                   
017276,000065: 37,2503           02536                           ADRES    ALLOOP                                
017277,000066: 37,2504           34746                           CAF      ZERO                                  #  ZERO THE PIPAS
017278,000067: 37,2505           54037                           TS       PIPAX                                 
017279,000068: 37,2506           54040                           TS       PIPAY                                 
017280,000069: 37,2507           54041                           TS       PIPAZ                                 
017281,000070: 37,2510           00003                           RELINT                                         
017282,000071: 37,2511           33075                           CA       77DECML                               
017283,000072: 37,2512           55571                           TS       ZERONDX                               
017284,000073: 37,2513           33076                           CA       ALXXXZ                                
017285,000074: 37,2514           02367                           TC       ZEROING                               
017286,000075: 37,2515           06060                           TC       INTPRET                               
017287,000076: 37,2516           77735                           SLOAD                                          
017288,000077: 37,2517           37057                                    SCHZEROS                              
017289,000078: 37,2520           25477                           STOVL    GCOMPSW    -1                         
017290,000079: 37,2521           37070                                    INTVAL     +2                         
017291,000080: 37,2522           26445                           STOVL    ALX1S                                 
017292,000081: 37,2523           37057                                    SCHZEROS                              
017293,000082: 37,2524           00325                           STORE    DELVX                                 
017294,000083: 37,2525           01472                           STORE    GCOMP                                 
017295,000084: 37,2526           77735                           SLOAD                                          
017296,000085: 37,2527           02441                                    TORQNDX                               
017297,000086: 37,2530           50076                           DCOMP    BMN                                   
017298,000087: 37,2531           76534                                    VERTSKIP                              
017299,000088: 37,2532           77624                           CALL                                           
017300,000089: 37,2533           76401                                    ERTHRVSE                              
017301,000090: 37,2534           77776        VERTSKIP           EXIT                                           
017302,000091: 37,2535           03035                           TC       SLEEPIE    +1                         
017303,000092: 

Page 396

017305,000094: 37,2536           31576        ALLOOP             CA       OVFLOWCK                              
017306,000095: 37,2537           00006                           EXTEND                                         
017307,000096: 37,2540           12542                           BZF      +2                                    
017308,000097: 37,2541           05263                           TC       TASKOVER                              
017309,000098: 37,2542           11530                           CCS      ALTIM                                 
017310,000099: 37,2543           30000                           CA       A                                     #  SHOULD NEVER HIT THIS LOCATION
017311,000100: 37,2544           55531                           TS       ALTIMS                                
017312,000101: 37,2545           40000                           CS       A                                     
017313,000102: 37,2546           55530                           TS       ALTIM                                 
017314,000103: 37,2547           44744                           CS       ONE                                   
017315,000104: 37,2550           61562                           AD       GEOCOMPS                              
017316,000105: 37,2551           00006                           EXTEND                                         
017317,000106: 37,2552           12556                           BZF      +4                                    
017318,000107: 37,2553           31412                           CA       LENGTHOT                              
017319,000108: 37,2554           00006                           EXTEND                                         
017320,000109: 37,2555           62562                           BZMF     +5                                    
017321,000110: 37,2556           31572                           CAE      1SECXT                                
017322,000111: 37,2557           05175                           TC       TWIDDLE                               
017323,000112: 37,2560  E5,1642                                  EBANK=   XSM                                   
017324,000113: 37,2560           02536                           ADRES    ALLOOP                                
017325,000114: 37,2561           34746                           CAF      ZERO                                  
017326,000115: 37,2562           56037                           XCH      PIPAX                                 
017327,000116: 37,2563           54324                           TS       DELVX                                 
017328,000117: 37,2564           34746                           CAF      ZERO                                  
017329,000118: 37,2565           56040                           XCH      PIPAY                                 
017330,000119: 37,2566           54326                           TS       DELVY                                 
017331,000120: 37,2567           34746                           CAF      ZERO                                  
017332,000121: 37,2570           56041                           XCH      PIPAZ                                 
017333,000122: 37,2571           54330                           TS       DELVZ                                 
017334,000123: 37,2572           34727        SPECSTS            CAF      PRIO20                                
017335,000124: 37,2573           05076                           TC       FINDVAC                               
017336,000125: 37,2574  E5,1642                                  EBANK=   XSM                                   
017337,000126: 37,2574           02577 76065                     2CADR    ALFLT                                 #  START THE JOB
017338,000127: 37,2576           05263                           TC       TASKOVER                              
017339,000128: 

Page 397

017341,000130: 37,2577           11562        ALFLT              CCS      GEOCOMPS                              
017342,000131: 37,2600           02602                           TC       +2                                    
017343,000132: 37,2601           02604                           TC       NORMLOP                               
017344,000133: 37,2602           04607                           TC       BANKCALL                              
017345,000134: 37,2603           15333                           CADR     1/PIPA                                
017346,000135: 37,2604           06060        NORMLOP            TC       INTPRET                               
017347,000136: 37,2605           77745                           DLOAD                                          
017348,000137: 37,2606           37066                                    INTVAL                                
017349,000138: 37,2607           24051                           STOVL    S1                                    
017350,000139: 37,2610           00325                                    DELVX                                 
017351,000140: 37,2611           76505                           VXM      VSL1                                  
017352,000141: 37,2612           02643                                    XSM                                   
017353,000142: 37,2613           57545                           DLOAD    DCOMP                                 
017354,000143: 37,2614           00160                                    MPAC       +3                         
017355,000144: 37,2615           16523                           STODL    DPIPAY                                
017356,000145: 37,2616           00162                                    MPAC       +5                         
017357,000146: 37,2617           02527                           STORE    DPIPAZ                                
017358,000147: 
017359,000148: 37,2620           76001                           SETPD    AXT,1                                 
017360,000149: 37,2621           00001                                    0                                     
017361,000150: 37,2622           00010                                    8D                                    
017362,000151: 37,2623           57535                           SLOAD    DCOMP                                 
017363,000152: 37,2624           02563                                    GEOCOMPS                              
017364,000153: 37,2625           77640                           BMN                                            
017365,000154: 37,2626           76772                                    PERFERAS                              
017366,000155: 37,2627           50135        ALCGKK             SLOAD    BMN                                   
017367,000156: 37,2630           02532                                    ALTIMS                                
017368,000157: 37,2631           76644                                    ALFLT3                                
017369,000158: 37,2632           72174        ALKCG              AXT,2    LXA,1                                 #  LOADS SLOPES AND TIME CONSTANTS AT RQST
017370,000159: 37,2633           00014                                    12D                                   
017371,000160: 37,2634           02444                                    ALX1S                                 
017372,000161: 37,2635           62143        ALKCG2             DLOAD*   INCR,1                                
017373,000162: 37,2636           02243                                    ALFDK      +144D,1                    
017374,000163: 37,2637           77775                           DEC      -2         B-14                       
017375,000164: 37,2640           12545                           STORE    ALDK       +10D,2                     
017376,000165: 37,2641           66104                           TIX,2    SXA,1                                 
017377,000166: 37,2642           76635                                    ALKCG2                                
017378,000167: 37,2643           02444                                    ALX1S                                 
017379,000168: 
017380,000169: 37,2644           77770        ALFLT3             AXT,1                                          
017381,000170: 37,2645           00010                                    8D                                    
017382,000171: 37,2646           41343        DELMLP             DLOAD*   DMP                                   
017383,000172: 37,2647           02533                                    DPIPAY     +8D,1                      
017384,000173: 37,2650           37100                                    PIPASC                                
017385,000174: 37,2651           43661                           SLR      BDSU*                                 
017386,000175: 37,2652           21212                                    9D                                    
017387,000176: 37,2653           02501                                    INTY       +8D,1                      
017388,000177: 37,2654           06501                           STORE    INTY       +8D,1                      
017389,000178: 37,2655           40725                           PDDL     DMP*                                  
017390,000179: 37,2656           37102                                    VELSC                                 
017391,000180: 

Page 398

017393,000182: 37,2657           02521                                    VLAUN      +8D,1                      
017394,000183: 37,2660           77732                           SL2R                                           
017395,000184: 37,2661           45425                           DSU      STADR                                 
017396,000185: 37,2662           71216                           STORE    DELM       +8D,1                      
017397,000186: 37,2663           06563                           STORE    DELM       +10D,1                     
017398,000187: 37,2664           77100                           TIX,1    AXT,2                                 
017399,000188: 37,2665           76646                                    DELMLP                                
017400,000189: 37,2666           00004                                    4                                     
017401,000190: 37,2667           56743        ALILP              DLOAD*   DMPR*                                 
017402,000191: 37,2670           75324                                    ALK        +4,2                       
017403,000192: 37,2671           75240                                    ALDK       +4,2                       
017404,000193: 37,2672           12453                           STORE    ALK        +4,2                       
017405,000194: 37,2673           77104                           TIX,2    AXT,2                                 
017406,000195: 37,2674           76667                                    ALILP                                 
017407,000196: 37,2675           00010                                    8D                                    
017408,000197: 37,2676           66140        ALKLP              LXC,1    SXA,1                                 
017409,000198: 37,2677           02445                                    CMPX1                                 
017410,000199: 37,2700           02445                                    CMPX1                                 
017411,000200: 37,2701           56743                           DLOAD*   DMPR*                                 
017412,000201: 37,2702           02450                                    ALK        +1,1                       
017413,000202: 37,2703           75216                                    DELM       +8D,2                      
017414,000203: 37,2704           77613                           DAD*                                           
017415,000204: 37,2705           75276                                    INTY       +8D,2                      
017416,000205: 37,2706           12501                           STORE    INTY       +8D,2                      
017417,000206: 37,2707           42743                           DLOAD*   DAD*                                  
017418,000207: 37,2710           75314                                    ALK        +12D,2                     
017419,000208: 37,2711           75230                                    ALDK       +12D,2                     
017420,000209: 37,2712           12463                           STORE    ALK        +12D,2                     
017421,000210: 37,2713           42673                           DMPR*    DAD*                                  
017422,000211: 37,2714           75216                                    DELM       +8D,2                      
017423,000212: 37,2715           75266                                    INTY       +16D,2                     
017424,000213: 37,2716           12511                           STORE    INTY       +16D,2                     
017425,000214: 37,2717           40743                           DLOAD*   DMP*                                  
017426,000215: 37,2720           37105                                    ALSK       +1,1                       
017427,000216: 37,2721           75216                                    DELM       +8D,2                      
017428,000217: 37,2722           42772                           SL1R     DAD*                                  
017429,000218: 37,2723           75256                                    VLAUN      +8D,2                      
017430,000219: 37,2724           12521                           STORE    VLAUN      +8D,2                      
017431,000220: 37,2725           76104                           TIX,2    AXT,1                                 
017432,000221: 37,2726           76676                                    ALKLP                                 
017433,000222: 37,2727           00010                                    8D                                    
017434,000223: 
017435,000224: 
017436,000225: 37,2730           64743        LOOSE              DLOAD*   PDDL*                                 
017437,000226: 37,2731           02523                                    ACCWD      +8D,1                      
017438,000227: 37,2732           02521                                    VLAUN      +8D,1                      
017439,000228: 37,2733           55523                           PDDL*    VDEF                                  
017440,000229: 37,2734           02531                                    POSNV      +8D,1                      
017441,000230: 37,2735           76521                           MXV      VSL1                                  
017442,000231: 37,2736           02001                                    TRANSM1                               

Page 399

017444,000233: 37,2737           77745                           DLOAD                                          
017445,000234: 37,2740           00155                                    MPAC                                  
017446,000235: 37,2741           06531                           STORE    POSNV      +8D,1                      
017447,000236: 37,2742           77745                           DLOAD                                          
017448,000237: 37,2743           00160                                    MPAC       +3                         
017449,000238: 37,2744           06521                           STORE    VLAUN      +8D,1                      
017450,000239: 37,2745           77745                           DLOAD                                          
017451,000240: 37,2746           00162                                    MPAC       +5                         
017452,000241: 37,2747           06523                           STORE    ACCWD      +8D,1                      
017453,000242: 37,2750           77700                           TIX,1                                          
017454,000243: 37,2751           76730                                    LOOSE                                 
017455,000244: 
017456,000245: 
017457,000246: 37,2752           76174                           AXT,2    AXT,1                                 #  EVALUATE SINES AND COSINES
017458,000247: 37,2753           00006                                    6                                     
017459,000248: 37,2754           00002                                    2                                     
017460,000249: 37,2755           57343        BOOP               DLOAD*   DMPR                                  
017461,000250: 37,2756           02503                                    ANGX       +2,1                       
017462,000251: 37,2757           37110                                    GEORGEJ                               
017463,000252: 37,2760           77722                           SR2R                                           
017464,000253: 37,2761           73406                           PUSH     SIN                                   
017465,000254: 37,2762           56072                           SL3R     XAD,1                                 
017466,000255: 37,2763           00046                                    X1                                    
017467,000256: 37,2764           10021                           STORE    16D,2                                 
017468,000257: 37,2765           77745                           DLOAD                                          
017469,000258: 37,2766           77746                           COS                                            
017470,000259: 37,2767           10027                           STORE    22D,2                                 #  COSINES
017471,000260: 37,2770           77704                           TIX,2                                          
017472,000261: 37,2771           76755                                    BOOP                                  
017473,000262: 
017474,000263: 37,2772           77776        PERFERAS           EXIT                                           
017475,000264: 37,2773           35007                           CA       EBANK7                                
017476,000265: 37,2774           54003                           TS       EBANK                                 
017477,000266: 37,2775  E7,1400                                  EBANK=   ATIGINC                               
017478,000267: 37,2775           01400                           TC       ATIGINC                               #  GOTO ERASABLE TO CALCULATE ONLY TO RETN
017479,000268: 
017480,000269:                                                                                                  #              CAUTION
017481,000270: 
017482,000271:                                                                                                  #  THE ERASABLE PROGRAM THAT DOES THE CALCULATIONS MUST BE LOADED
017483,000272:                                                                                                  #  BEFORE ANY ATTEMPT IS MADE TO RUN THE IMU PERFORMANCE TEST
017484,000273: 
017485,000274: 37,2776  E5,1400                                  EBANK=   AZIMUTH                               
017486,000275: 37,2776           11412                           CCS      LENGTHOT                              
017487,000276: 37,2777           03034                           TC       SLEEPIE                               
017488,000277: 37,3000           11440                           CCS      TORQNDX                               
017489,000278: 37,3001           13003                           TCF      +2                                    
017490,000279: 37,3002           03005                           TC       SETUPER1                              
017491,000280: 37,3003           30032                           CA       CDUX                                  
017492,000281: 37,3004           55414                           TS       LOSVEC     +1                         #  FOR TROUBLESHOOTING VD POSNS 2$4
017493,000282: 

Page 400

017495,000284: 37,3005           06060        SETUPER1           TC       INTPRET                               
017496,000285: 37,3006           65345                           DLOAD    PDDL                                  #  ANGLES FROM DRIFT TEST ONLY
017497,000286: 37,3007           02473                                    ANGZ                                  
017498,000287: 37,3010           02477                                    ANGY                                  
017499,000288: 37,3011           55525                           PDDL     VDEF                                  
017500,000289: 37,3012           02501                                    ANGX                                  
017501,000290: 37,3013           74276                           VCOMP    VXSC                                  
017502,000291: 37,3014           37110                                    GEORGEJ                               
017503,000292: 37,3015           74521                           MXV      VSR1                                  
017504,000293: 37,3016           02643                                    XSM                                   
017505,000294: 37,3017           02740                           STORE    OGC                                   
017506,000295: 37,3020           77776                           EXIT                                           
017507,000296: 
017508,000297: 
017509,000298: 37,3021           32475                           CA       OGCPL                                 
017510,000299: 37,3022           04607                           TC       BANKCALL                              
017511,000300: 37,3023           17310                           CADR     IMUPULSE                              
017512,000301: 37,3024           02315                           TC       IMUSLLLG                              
017513,000302: 37,3025           11440        GEOSTRT4           CCS      TORQNDX                               #  ONLY POSITIVE IF IN VERTICAL DRIFT TEST
017514,000303: 37,3026           02263                           TC       VALMIS                                
017515,000304: 37,3027           06060                           TC       INTPRET                               
017516,000305: 37,3030           77624                           CALL                                           
017517,000306: 37,3031           76401                                    ERTHRVSE                              
017518,000307: 37,3032           77776                           EXIT                                           
017519,000308: 37,3033           02117                           TC       TORQUE                                
017520,000309: 
017521,000310: 
017522,000311: 37,3034           55412        SLEEPIE            TS       LENGTHOT                              #  TEST NOT OVER-DECREMENT LENGTHOT
017523,000312: 37,3035           11440                           CCS      TORQNDX                               #  ARE WE DOING VERTDRIFT
017524,000313: 37,3036           02447                           TC       EARTHR*                               
017525,000314: 37,3037           05146                           TC       ENDOFJOB                              
017526,000315: 
017527,000316: 
017528,000317: 37,3040           35005        SOMEERRR           CA       EBANK5                                
017529,000318: 37,3041           54003                           TS       EBANK                                 
017530,000319: 37,3042           34744                           CA       ONE                                   
017531,000320: 37,3043           55576                           TS       OVFLOWCK                              #  STOP ALLOOP FROM CALLING ITSELF
017532,000321: 37,3044           05571                           TC       ALARM                                 
017533,000322: 37,3045           01600                           OCT      1600                                  
017534,000323: 37,3046           02270                           TC       ENDTEST1                              
017535,000324: 37,3047           33054        SOMERR2            CAF      OCT1601                               
017536,000325: 37,3050           05740                           TC       VARALARM                              
017537,000326: 37,3051           05520                           TC       DOWNFLAG                              
017538,000327: 37,3052           00007                           ADRES    IMUSE                                 
017539,000328: 37,3053           05146                           TC       ENDOFJOB                              
017540,000329: 
017541,000330: 37,3054           01601        OCT1601            OCT      01601                                 
017542,000331: 37,3055           06200        DEC585             OCT      06200                                 #  3200 B+14 ORDER IS IMPORTANT
017543,000332: 37,3056           00000 00000  SCHZEROS           2DEC     .00000000                             
017544,000333: 

Page 401

017546,000335: 37,3060           00000 00000                     2DEC     .00000000                             
017547,000336: 37,3062           00000                           OCT      00000                                 
017548,000337: 37,3063           00000        ONEDPP             OCT      00000                                 #  ORDER IS IMPORTANT
017549,000338: 37,3064           00001                           OCT      00001                                 
017550,000339: 
017551,000340: 37,3065           00004        INTVAL             OCT      4                                     
017552,000341: 37,3066           00002                           OCT      2                                     
017553,000342: 37,3067           00220                           DEC      144        B-14                       
017554,000343: 37,3070           77776                           DEC      -1         B-14                       
017555,000344: 37,3071           35730 00035  SOUPLY             2DEC     .93505870                             #  INITIAL GAINS FOR PIP OUTPUTS
017556,000345: 37,3073           10317 17550                     2DEC     .26266423                             #  INITIAL GAINS/4 FOR ERECTION ANGLES
017557,000346: 
017558,000347: 37,3075           00115        77DECML            DEC      77         B-14                       
017559,000348: 37,3076           01443        ALXXXZ             GENADR   ALX1S      -1                         
017560,000349: 37,3077           04133 02265  PIPASC             2DEC     .13055869                             
017561,000350: 37,3101           57223 66451  VELSC              2DEC     -.52223476                            #  512/980.402
017562,000351: 37,3103           05427 12577  ALSK               2DEC     .17329931                             #  SSWAY VEL GAIN X 980.402/4096
017563,000352: 37,3105           77567 44202                     2DEC     -.00835370                            #  SSWAY ACCEL GAIN X 980.402/4096
017564,000353: 
017565,000354: 
017566,000355: 37,3107           24276 14066  GEORGEJ            2DEC     .63661977                             
017567,000356: 37,3111           23073 11773  GEORGEK            2DEC     .59737013                             

End of include-file IMU_PERFORMANCE_TESTS_4.agc.  Parent file is MAIN.agc