Source Code
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These source-code files were reconstructed by Mike Stewart from dumps of the RETREAD 50 program stored in physical AGC core-rope modules (B1 and B2) belonging to the Computer History Museum, Mountain View, California. The reconstruction was aided by pre-existing source code for the AGC programs RETREAD 44 and AURORA 12. Read about the process here. Assembling this source code with yaYUL produces core ropes identical to those of the physical modules. Page-number references refer to corresponding sections of RETREAD 44 source code. No printouts of RETREAD 50 program listings are available. New sections of the software (appearing in EXTENDED_VERBS_FOR_MODING.agc) have been disassembled; labels and comments have been either taken from similar code in later programs or, in cases where this was not possible, added by VirtualAGC for clarity. |
003664,000002: ## Copyright: Public domain.
003665,000003: ## Filename: INTER-BANK_COMMUNICATION.agc
003666,000004: ## Purpose: Part of the source code for AGC program Retread 50.
003667,000005: ## Assembler: yaYUL
003668,000006: ## Contact: Ron Burkey <info@sandroid.org>.
003669,000007: ## Website: www.ibiblio.org/apollo/Restoration.html
003670,000008: ## Mod history: 2019-06-12 MAS Recreated from Computer History Museum's
003671,000009: ## physical core-rope modules.
003672,000010:
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Page 105 |
003674,000012:
003675,000013: # THE FOLLOWING ROUTINE CAN BE USED TO CALL A SUBROUTINE IN ANOTHER BANK. IN THE BANKCALL VERSION, THE
003676,000014: # CADR OF THE SUBROUTINE IMMEDIATELY FOLLOWS THE TC BANKCALL INSTRUCTION, WITH C(A) AND C(L) PRESERVED.
003677,000015:
003678,000016: 4063 SETLOC ENDINTFF
003679,000017:
003680,000018: 4063 52120 BANKCALL DXCH BUF2 # SAVE INCOMING A,L.
003681,000019: 4064 50002 INDEX Q # PICK UP CADR.
003682,000020: 4065 30000 CA 0
003683,000021: 4066 24002 INCR Q # SO WE RETURN TO THE LOC. AFTER THE CADR.
003684,000022:
003685,000023: # SWCALL IS IDENTICAL TO BANKCALL, EXCEPT THAT THE CADR ARRIVES IN A.
003686,000024:
003687,000025: 4067 54001 SWCALL TS L
003688,000026: 4070 22004 LXCH FBANK # SWITCH BANKS, SAVING RETURN.
003689,000027: 4071 76425 MASK LOW10 # GET SUB-ADDRESS OF CADR.
003690,000028: 4072 56002 XCH Q # A,L NOW CONTAINS DP RETURN.
003691,000029: 4073 52120 DXCH BUF2 # RESTORING INPUTS IF THIS IS A BANKCALL.
003692,000030: 4074 50002 INDEX Q
003693,000031: 4075 02000 TC 10000 # SETTING Q TO SWRETURN.
003694,000032:
003695,000033: 4076 56120 SWRETURN XCH BUF2 +1 # COMES HERE TO RETURN TO CALLER. C(A,L)
003696,000034: 4077 56004 XCH FBANK # ARE PRESERVED FOR RETURN.
003697,000035: 4100 56120 XCH BUF2 +1
003698,000036: 4101 00117 TC BUF2
003699,000037:
003700,000038:
003701,000039:
003702,000040: # THE FOLLOWING ROUTINE CAN BE USED AS A UNILATERAL JUMP WITH C(A,L) PRESERVED AND THE CADR IMMEDIATELY
003703,000041: # FOLLOWING THE TC POSTJUMP INSTRUCTION.
003704,000042:
003705,000043: 4102 56002 POSTJUMP XCH Q # SAVE INCOMING C(A).
003706,000044: 4103 50000 INDEX A # GET CADR.
003707,000045: 4104 30000 CA 0
003708,000046:
003709,000047: # BANKJUMP IS THE SAME AS POSTJUMP, EXCEPT THAT THE CADR ARRIVES IN A.
003710,000048:
003711,000049: 4105 54004 BANKJUMP TS FBANK
003712,000050: 4106 76425 MASK LOW10
003713,000051: 4107 56002 XCH Q # RESTORING INPUT C(A) IF THIS WAS A
003714,000052: 4110 50002 INDEX Q # POSTJUMP.
003715,000053: 4111 12000 TCF 10000
003716,000054:
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Page 106 |
003718,000056: # THE FOLLOWING ROUTINE GETS THE RETURN CADR SAVED BY SWCALL OR BANKCALL AND LEAVES IT IN A.
003719,000057:
003720,000058: 4112 36425 MAKECADR CAF LOW10
003721,000059: 4113 70117 MASK BUF2
003722,000060: 4114 60120 AD BUF2 +1
003723,000061: 4115 00002 TC Q
003724,000062:
003725,000063: # THE FOLLOWING ROUTINE OBTAINS THE TWO WORDS BEGINNING AT THE ADDRESS ARRIVING IN A, AND LEAVES THEM IN
003726,000064: # A,L.
003727,000065:
003728,000066: 4116 54001 DATACALL TS L
003729,000067: 4117 22004 LXCH FBANK
003730,000068: 4120 22121 LXCH MPTEMP # SAVE FORMER BANK.
003731,000069: 4121 76425 MASK LOW10
003732,000070: 4122 00006 EXTEND
003733,000071: 4123 50000 INDEX A
003734,000072: 4124 32001 DCA 10000
003735,000073:
003736,000074: 4125 56121 XCH MPTEMP
003737,000075: 4126 54004 TS FBANK # RESTORE FBANK.
003738,000076: 4127 30121 CA MPTEMP
003739,000077: 4130 00002 TC Q
003740,000078:
003741,000079: 4131 ENDIBNKF EQUALS
End of include-file INTER-BANK_COMMUNICATION.agc. Parent file is MAIN.agc