# Copyright: Public domain. # Filename: INTER-BANK_COMMUNICATION.agc # Purpose: Part of the source code for Comanche, build 055. It # is part of the source code for the Command Module's # (CM) Apollo Guidance Computer (AGC), Apollo 11. # Assembler: yaYUL # Reference: pp. 1103-1106 # Contact: Ron Burkey # Website: http://www.ibiblio.org/apollo. # Mod history: 2009-05-08 RSB Adapted from Colossus249/ file of same name # and page images. Corrected various typos # in the transcription of program comments, # and these should be back-ported to # Colossus249. # # The contents of the "Comanche055" files, in general, are transcribed # from scanned documents. # # Assemble revision 055 of AGC program Comanche by NASA # 2021113-051. April 1, 1969. # # This AGC program shall also be referred to as Colossus 2A # # Prepared by # Massachusetts Institute of Technology # 75 Cambridge Parkway # Cambridge, Massachusetts # # under NASA contract NAS 9-4065. # # Refer directly to the online document mentioned above for further # information. Please report any errors to info@sandroid.org. # Page 1103 # THE FOLLOWING ROUTINE CAN BE USED TO CALL A SUBROUTINE IN ANOTHER BANK. IN THE BANKCALL VERSION, THE # CADR OF THE SUBROUTINE IMMEDIATELY FOLLOWS THE TC BANKCALL INSTRUCTION, WITH C(A) AND C(L) PRESERVED. BLOCK 02 COUNT 02/BANK BANKCALL DXCH BUF2 # SAVE INCOMING A,L. INDEX Q # PICK UP CADR. CA 0 INCR Q # SO WE RETURN TO THE LOC. AFTER THE CADR. # SWCALL IS IDENTICAL TO BANKCALL, EXCEPT THAT THE CADR ARRIVES IN A. SWCALL TS L LXCH FBANK # SWITCH BANKS, SAVING RETURN. MASK LOW10 # GET SUB-ADDRESS OF CADR. XCH Q # A,L NOW CONTAINS DP RETURN. DXCH BUF2 # RESTORING INPUTS IF THIS IS A BANKCALL. INDEX Q TC 10000 # SETTING Q TO SWRETURN SWRETURN XCH BUF2 +1 # COMES HERE TO RETURN TO CALLER. C(A,L) XCH FBANK # ARE PRESERVED FOR RETURN. XCH BUF2 +1 TC BUF2 # THE FOLLOWING ROUTINE CAN BE USED AS A UNILATERAL JUMP WITH C(A,L) PRESERVED AND THE CADR IMMEDIATELY # FOLLOWING THE TC POSTJUMP INSTRUCTION. POSTJUMP XCH Q # SAVE INCOMING C(A). INDEX A # GET CADR. CA 0 # BANKJUMP IS THE SAME AS POSTJUMP, EXCEPT THAT THE CADR ARRIVES IN A. BANKJUMP TS FBANK MASK LOW10 XCH Q # RESTORING INPUT C(A) IF THIS WAS A Q+10000 INDEX Q # POSTJUMP. PRIO12 TCF 10000 # PRIO12 = TCF 10000 = 12000 # Page 1104 # THE FOLLOWING ROUTINE GETS THE RETURN CADR SAVED BY SWCALL OR BANKCALL AND LEAVES IT IN A. MAKECADR CAF LOW10 MASK BUF2 AD BUF2 +1 TC Q SUPDACAL TS MPTEMP XCH FBANK # SET FBANK FOR DATA. EXTEND ROR SUPERBNK # SAVE FBANK IN BITS 15-11, AND XCH MPTEMP # SUPERBANK IN BITS 7-5. MASK LOW10 XCH L # SAVE REL. ADR. IN BANK, FETCH SUPERBITS. INHINT # BECAUSE RUPT DOES NOT SAVE SUPERBANK. EXTEND WRITE SUPERBNK # SET SUPERBANK FOR DATA. INDEX L CA 10000 # PINBALL (FIX MEM DISP) PREVENTS DCA HERE XCH MPTEMP # SAVE 1ST WD, FETCH OLD FBANK AND SBANK. EXTEND WRITE SUPERBNK # RESTORE SUPERBANK. RELINT TS FBANK # RESTORE FBANK. CA MPTEMP # RECOVER FIRST WORD OF DATA. RETURN # 24 WDS. DATACALL 516 MU, SUPDACAL 432 MU # Page 1105 # THE FOLLOWING ROUTINES ARE IDENTICAL TO BANKCALL AND SWCALL EXCEPT THAT THEY ARE USED IN INTERRUPT. IBNKCALL DXCH RUPTREG3 # USES RUPTREG3,4 FOR DP RETURN ADDRESS. INDEX Q # Was CAF --- RSB 2009 CA 0 INCR Q ISWCALL TS L LXCH FBANK MASK LOW10 XCH Q DXCH RUPTREG3 INDEX Q TC 10000 ISWRETRN XCH RUPTREG4 XCH FBANK XCH RUPTREG4 TC RUPTREG3 # 2. USPRCADR ACCESSES INTERPRETIVE CODING IN OTHER THAN THE USER'S FBANK. THE CALLING SEQUENCE IS AS FOLLOWS: # L TC USPRCADR # L+1 CADR INTPRETX # INTPRETX IS THE INTERPRETIVE CODING # # RETURN IS TO L+2 USPRCADR TS LOC # SAVE A CA BIT8 TS EDOP # EXIT INSTRUCTION TO EDOP CA BBANK TS BANKSET # USER'S BBANK TO BANKSET INDEX Q CA 0 TS FBANK # INTERPRETIVE BANK TO FBANK MASK LOW10 # YIELDS INTERPRETIVE RELATIVE ADDRESS XCH Q # INTERPRETIVE ADDRESS TO Q, FETCHING L+1 XCH LOC # L+1 TO LOC, RETRIEVING ORIGINAL A TCF Q+10000 # Page 1106 # THERE ARE FOUR POSSIBLE SETTINGS FOR CHANNEL 07. (CHANNEL 07 CONTAINS SUPERBANK SETTING.) # # PSEUDO-FIXED OCTAL PSEUDO # SUPERBANK SETTING S-REG. VALUE BANK NUMBERS ADDRESSES # ---------- ------- ------------ ------------ ------------ # SUPERBANK 3 0XX 2000 - 3777 30 - 37 70000 - 107777 (WHERE XX CAN BE ANYTHING AND # WILL USUALLY BE SEEN AS 11) # SUPERBANK 4 100 2000 - 3777 40 - 47 110000 - 127777 (AS FAR AS IT CAN BE SEEN, # ONLY BANKS 40-43 WILL EVER BE # AND ARE PRESENTLY AVAILABLE) # SUPERBANK 5 101 2000 - 3777 50 - 57 130000 - 147777 (PRESENTLY NOT AVAILABLE TO # THE USER) # SUPERBANK 6 110 2000 - 3777 60 - 67 150000 - 167777 (PRESENTLY NOT AVAILABLE TO # THE USER) # *** THIS ROUTINE MAYBE CALLED BY ANY PROGRAM LOCATED IN BANKS 00 - 27. I.E., NO PROGRAM LIVING IN ANY # SUPERBANK SHOULD USE SUPERSW. *** # # SUPERSW MAYBE CALLED IN THIS FASHION: # CAF ABBCON WHERE -- ABBCON BBCON SOMETHIN -- # TCR SUPERSW (THE SUPERBNK BITS ARE IN THE BBCON) # ... ... # . . # . . # OR IN THIS FASHION : # CAF SUPERSET WHERE SUPERSET IS ONE OF THE FOUR AVAILABLE # TCR SUPERSW SUPERBANK BIT CONSTANTS: # ... ... SUPER011 OCTAL 60 # . . SUPER100 OCTAL 100 # . . SUPER101 OCTAL 120 # SUPER110 OCTAL 140 SUPERSW EXTEND WRITE SUPERBNK # WRITE BITS 7-6-5 OF THE ACCUMULATOR INTO # CHANNEL 07 TC Q # TC TO INSTRUCTION FOLLOWING # TC SUPERSW