Apple-2-SW/A2NoSlotMIDI
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A2NoSlotMIDI/SRC/A2NoSlotMidi/main.lst

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ca65 V2.13.3 - (C) Copyright 1998-2012 Ullrich von Bassewitz
Main file : main.s
Current file: main.s
000000r 1 ;-------------------------------------------------------------------------
000000r 1 ;
000000r 1 ; main.s
000000r 1 ; A2NoSlotMidi
000000r 1 ;
000000r 1 ; Created by Eric Rangell on 7/17/18.
000000r 1 ;-------------------------------------------------------------------------
000000r 1 ; APPLE MIDI DRIVER THROUGH ANNUNCIATOR 0
000000r 1 ; Copyright © 1998-2018 Eric Rangell. MIT License.
000000r 1 ;-------------------------------------------------------------------------
000000r 1 ; THIS DRIVER IMPLEMENTS ASYNCHRONOUS SERIAL DATA TRANSMISSION
000000r 1 ; THROUGH THE APPLE ANNUNCIATOR 0 OUTPUT PORT OF THE GAME CONNECTOR
000000r 1 ; USING 32 CYCLES PER BIT TO ACHIEVE A 31.25K MIDI BAUD RATE.
000000r 1 ;
000000r 1 ; //GS USERS NEED TO RUN THIS PROGRAM IN NORMAL SPEED MODE
000000r 1 ;
000000r 1 ; THE OUTPUT IS INITIALIZED TO A HIGH LOGIC VOLTAGE. WHEN IT GOES
000000r 1 ; LOW FOR 32 MICROSECONDS, THAT INDICATES THE START BIT OF A MIDI BYTE.
000000r 1 ; THEN 8 BYTES OF DATA ARE TRANSMITTED, FOLLOWED BY A HIGH STOP BIT.
000000r 1 ; THE DATA BYTES REPRESENT MIDI MESSAGES WHICH CAN BE INTERPRETED BY
000000r 1 ; ANY MUSICAL INSTRUMENT THAT IMPLEMENTS MIDI.
000000r 1 ;
000000r 1 ; ENTRY POINTS: (Note: Origin must be set in Makefile)
000000r 1 ;
000000r 1 ; $9000 = INITIALIZE - TURNS ON ANNUNCIATOR 0 - MUST BE CALLED ONCE
000000r 1 ; $9003 = APPLESOFT CALL TO SEND ONE MIDI BYTE. POKE THE BYTE IN $9004.
000000r 1 ; $9005 = ASSEMBLY CALL TO SEND ONE MIDI BYTE FROM ACCUMULATOR
000000r 1 ; $9008 = APPLESOFT OR ASSEMBLY CALL TO SEND SEVERAL BYTES AT ONCE:
000000r 1 ; THE CALLER POPULATES LOCATION $D7 WITH THE NUMBER OF BYTES TO BE
000000r 1 ; TRANSMITTED, AND A POINTER IN $CE,CF (LO,HI) WITH THE ADDRESS OF
000000r 1 ; THE DATA BYTES, THEN CALLS THE ENTRY POINT "SENDMSG" TO TRANSMIT
000000r 1 ; THE MESSAGE.
000000r 1 ; $900B = TURN ALL NOTES OFF
000000r 1 ; $900E = SEND A TEST MESSAGE - C MAJOR CHORD NOTE ONS
000000r 1 ; $9011 = SEND A TEST MESSAGE - C MAJOR CHORD NOTE OFFS
000000r 1 ; $9014 = CHANGE ANNUNCIATOR - MODIFIES CODE TO USE DIFFERENT ANNUNCIATOR
000000r 1 ; $9017 = ANNUNCIATOR TO USE: 0-3 - only looks at least significant 2 bits
000000r 1 ; $9018 = CHANGE LOGIC - BIT 7
000000r 1 ; $901B = SET BIT 7 TO USE NEGATIVE LOGIC
000000r 1 ;-------------------------------------------------------------------------
000000r 1 ; Enhancements for 2018:
000000r 1 ; 1. Disable interrupts during critical timing sections, preserve interrupt status
000000r 1 ; 2. Entry point to reconfigure program to use a different annunciator pair
000000r 1 ; 3. Entry point to reconfigure program for hardware interface using inverters only (not buffers)
000000r 1 ;-------------------------------------------------------------------------
000000r 1 ; CALLER MUST POPULATE THE FOLLOWING TWO ZERO PAGE LOCATIONS FOR SENDMSG:
000000r 1 NUMBYTES = $D7 ;NUMBER OF BYTES TO BE TRANSMITTED NOW (1-256)
000000r 1 ; ;THE VALUE 0 WILL TRANSMIT 256 BYTES.
000000r 1 DATAPTR = $CE ;POINTER TO THE BYTES TO BE TRANSMITTED NOW
000000r 1 ;-------------------------------------------------------------------------
000000r 1 AN0OFF = $C058 ;APPLE ADDRESSES THAT CONTROL ANNUNCIATOR OUTPUTS
000000r 1 AN0ON = $C059 ;PROGRAM REFERNCES ARE RELATIVE TO AN0
000000r 1 ;AN1OFF = $C05A
000000r 1 ;AN1ON = $C05B
000000r 1 ;AN2OFF = $C05C
000000r 1 ;AN2ON = $C05D
000000r 1 ;AN3OFF = $C05E
000000r 1 ;AN3ON = $C05F
000000r 1 ;-------------------------------------------------------------------------
000000r 1 .proc main
000000r 1 ;---------------------------------------------------------------------------
000000r 1 START:
000000r 1 4C rr rr JMP INIT ;MAIN ENTRY POINT - INITIALIZES ANNUNCIATORS
000003r 1 SENDFP:
000003r 1 A9 90 LDA #$90 ;ENTRY POINT FOR APPLESOFT: POKE BYTE AND CALL
000005r 1 SENDONE:
000005r 1 4C rr rr JMP XMITONE ;ENTRY POINT FOR TRANSMITTING ONE BYTE FROM ACCUM
000008r 1 SENDMSG:
000008r 1 4C rr rr JMP XMITMSG ;ENTRY POINT FOR TRANSMITTING A MIDI MESSAGE
00000Br 1 ALLNOFF:
00000Br 1 4C rr rr JMP QUIET ;TURN ALL NOTES OFF
00000Er 1 TEST1:
00000Er 1 4C rr rr JMP TESTMSG1 ;SEND TEST MESSAGE 1 - C MAJOR CHORD ON
000011r 1 TEST2:
000011r 1 4C rr rr JMP TESTMSG2 ;SEND TEST MESSAGE 2 - C MAJOR CHORD OFF
000014r 1 ;
000014r 1 CHNGANNC:
000014r 1 4C rr rr JMP CHGANNC ;RECONFIGURE PROGRAM TO USE ANNUNCIATOR NUMBER IN NEXT BYTE
000017r 1 ANNC2USE:
000017r 1 00 .byte $00 ;ONLY LEAST SIGNIFICANT 2 BITS ARE USED
000018r 1 CHNGLOGC:
000018r 1 4C rr rr JMP CHGLOGIC ;RECONFIGURE PROGRAM TO USE POSITIVE OR NEGATIVE LOGIC
00001Br 1 LOGICBYT:
00001Br 1 00 .byte $00 ;SET HIGH BIT TO 1 TO USE NEGATIVE LOGIC, ELSE POSITIVE LOGIC (DEFAULT)
00001Cr 1 ;---------------------------------------------------------------------------
00001Cr 1 00 SAVENBYT: .byte $00 ;SAVE AREA FOR NUMBYTES
00001Dr 1 00 TEMPA: .byte $00
00001Er 1 00 TEMPX: .byte $00
00001Fr 1 ;ANNPAIR: .byte $00 ; ANNUNCIATOR NUMBER TIMES 2 (1=C05A, 2=C05C, 3=C05E)
00001Fr 1 ;---------------------------------------------------------------------------
00001Fr 1 INIT:
00001Fr 1 2C 59 C0 BIT AN0ON
000022r 1 60 RTS
000023r 1 ;---------------------------------------------------------------------------
000023r 1 XMITMSG:
000023r 1 A5 D7 LDA NUMBYTES ;SAVE NUMBER OF BYTES
000025r 1 8D rr rr STA SAVENBYT ;BECAUSE WE WILL CLOBBER IT
000028r 1 A0 00 LDY #$00 ;Y WILL BE AN INDEX INTO THE DATA AREA
00002Ar 1 XMITLOOP:
00002Ar 1 B1 CE LDA (DATAPTR),Y ;GET A DATA BYTE
00002Cr 1 20 rr rr JSR XMITONE
00002Fr 1 C8 INY ;POINT TO NEXT BYTE
000030r 1 C6 D7 DEC NUMBYTES ;DECREMENT COUNTER
000032r 1 A5 D7 LDA NUMBYTES ;CHECK IF ZERO
000034r 1 D0 F4 BNE XMITLOOP ;LOOP UNTIL DONE SENDING ALL BYTES
000036r 1 AD rr rr LDA SAVENBYT
000039r 1 85 D7 STA NUMBYTES ;RESTORE ORIGINAL VALUE OF NUMBYTES
00003Br 1 60 RTS
00003Cr 1 ;---------------------------------------------------------------------------
00003Cr 1 XMITONE:
00003Cr 1 8D rr rr STA TEMPA ;SAVE A AND X REGISTERS
00003Fr 1 8E rr rr STX TEMPX
000042r 1 ;
000042r 1 0A ASL A ;SHIFT BIT INTO CARRY
000043r 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
000044r 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
000046r 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
000048r 1 8D rr rr STA BIT7+1 ;MODIFY THE XMITBITS SUBROUTINE
00004Br 1 8A TXA ;RESTORE ACCUMULATOR
00004Cr 1 ;
00004Cr 1 0A ASL A ;SHIFT BIT INTO CARRY
00004Dr 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
00004Er 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
000050r 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
000052r 1 8D rr rr STA BIT6+1 ;MODIFY THE XMITBITS SUBROUTINE
000055r 1 8A TXA ;RESTORE ACCUMULATOR
000056r 1 ;
000056r 1 0A ASL A ;SHIFT BIT INTO CARRY
000057r 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
000058r 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
00005Ar 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
00005Cr 1 8D rr rr STA BIT5+1 ;MODIFY THE XMITBITS SUBROUTINE
00005Fr 1 8A TXA ;RESTORE ACCUMULATOR
000060r 1 ;
000060r 1 0A ASL A ;SHIFT BIT INTO CARRY
000061r 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
000062r 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
000064r 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
000066r 1 8D rr rr STA BIT4+1 ;MODIFY THE XMITBITS SUBROUTINE
000069r 1 8A TXA ;RESTORE ACCUMULATOR
00006Ar 1 ;
00006Ar 1 0A ASL A ;SHIFT BIT INTO CARRY
00006Br 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
00006Cr 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
00006Er 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
000070r 1 8D rr rr STA BIT3+1 ;MODIFY THE XMITBITS SUBROUTINE
000073r 1 8A TXA ;RESTORE ACCUMULATOR
000074r 1 ;
000074r 1 0A ASL A ;SHIFT BIT INTO CARRY
000075r 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
000076r 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
000078r 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
00007Ar 1 8D rr rr STA BIT2+1 ;MODIFY THE XMITBITS SUBROUTINE
00007Dr 1 8A TXA ;RESTORE ACCUMULATOR
00007Er 1 ;
00007Er 1 0A ASL A ;SHIFT BIT INTO CARRY
00007Fr 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
000080r 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
000082r 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
000084r 1 8D rr rr STA BIT1+1 ;MODIFY THE XMITBITS SUBROUTINE
000087r 1 8A TXA ;RESTORE ACCUMULATOR
000088r 1 ;
000088r 1 0A ASL A ;SHIFT BIT INTO CARRY
000089r 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
00008Ar 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
00008Cr 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
00008Er 1 8D rr rr STA BIT0+1 ;MODIFY THE XMITBITS SUBROUTINE
000091r 1 8A TXA ;RESTORE ACCUMULATOR
000092r 1 ;
000092r 1 20 rr rr JSR XMITBITS ;SEND THE BYTE OUT
000095r 1 AE rr rr LDX TEMPX
000098r 1 AD rr rr LDA TEMPA ;RESTORE X AND A
00009Br 1 60 RTS
00009Cr 1 ;-----------------------------------------------------------------------
00009Cr 1 XMITBITS:
00009Cr 1 08 PHP ;SAVE CURRENT INTERRUPT STATUS
00009Dr 1 78 SEI ;MASK INTERRUPTS DURING CRITICAL TIMING SECTION
00009Er 1 2C 58 C0 BIT AN0OFF ;4 CYCLES - TRANSMIT START BIT - ALWAYS LOW
0000A1r 1 20 rr rr JSR DELAY22 ;6+22
0000A4r 1 BIT0:
0000A4r 1 2C 58 C0 BIT AN0OFF ;4
0000A7r 1 20 rr rr JSR DELAY22 ;6+22
0000AAr 1 BIT1:
0000AAr 1 2C 58 C0 BIT AN0OFF ;4
0000ADr 1 20 rr rr JSR DELAY22 ;6+22
0000B0r 1 BIT2:
0000B0r 1 2C 58 C0 BIT AN0OFF ;4
0000B3r 1 20 rr rr JSR DELAY22 ;6+22
0000B6r 1 BIT3:
0000B6r 1 2C 58 C0 BIT AN0OFF ;4
0000B9r 1 20 rr rr JSR DELAY22 ;6+22
0000BCr 1 BIT4:
0000BCr 1 2C 58 C0 BIT AN0OFF ;4
0000BFr 1 20 rr rr JSR DELAY22 ;6+22
0000C2r 1 BIT5:
0000C2r 1 2C 58 C0 BIT AN0OFF ;4
0000C5r 1 20 rr rr JSR DELAY22 ;6+22
0000C8r 1 BIT6:
0000C8r 1 2C 58 C0 BIT AN0OFF ;4
0000CBr 1 20 rr rr JSR DELAY22 ;6+22
0000CEr 1 BIT7:
0000CEr 1 2C 58 C0 BIT AN0OFF ;4
0000D1r 1 20 rr rr JSR DELAY22 ;6+22
0000D4r 1 2C 59 C0 BIT AN0ON ;4 ;TRANSMIT STOP BIT - ALWAYS HIGH
0000D7r 1 20 rr rr JSR DELAY22 ;6+22
0000DAr 1 28 PLP ;RESTORE SAVED INTERRUPT STATUS
0000DBr 1 60 RTS
0000DCr 1 ;-----------------------------------------------------------------------
0000DCr 1 DELAY22:
0000DCr 1 EA NOP ;WAIT 22 CYCLES
0000DDr 1 EA NOP
0000DEr 1 EA NOP
0000DFr 1 EA NOP
0000E0r 1 EA NOP
0000E1r 1 EA NOP
0000E2r 1 EA NOP
0000E3r 1 EA NOP
0000E4r 1 60 RTS
0000E5r 1 ;-----------------------------------------------------------------------
0000E5r 1 TESTMSG1:
0000E5r 1 A9 07 LDA #7
0000E7r 1 85 D7 STA NUMBYTES
0000E9r 1 A9 rr LDA #<TESTDAT1
0000EBr 1 85 CE STA DATAPTR
0000EDr 1 A9 rr LDA #>TESTDAT1
0000EFr 1 85 CF STA DATAPTR+1
0000F1r 1 20 rr rr JSR SENDMSG
0000F4r 1 60 RTS
0000F5r 1 ;-----------------------------------------------------------------------
0000F5r 1 TESTMSG2:
0000F5r 1 A9 07 LDA #7
0000F7r 1 85 D7 STA NUMBYTES
0000F9r 1 A9 rr LDA #<TESTDAT2
0000FBr 1 85 CE STA DATAPTR
0000FDr 1 A9 rr LDA #>TESTDAT2
0000FFr 1 85 CF STA DATAPTR+1
000101r 1 20 rr rr JSR SENDMSG
000104r 1 60 RTS
000105r 1 ;-----------------------------------------------------------------------
000105r 1 QUIET:
000105r 1 A9 90 LDA #$90
000107r 1 85 D7 STA NUMBYTES
000109r 1 A9 rr LDA #<QUIETMSG
00010Br 1 85 CE STA DATAPTR
00010Dr 1 A9 rr LDA #>QUIETMSG
00010Fr 1 85 CF STA DATAPTR+1
000111r 1 20 rr rr JSR SENDMSG
000114r 1 60 RTS
000115r 1 ;-----------------------------------------------------------------------
000115r 1 CHGANNC:
000115r 1 60 RTS
000116r 1 ;-----------------------------------------------------------------------
000116r 1 CHGLOGIC:
000116r 1 60 RTS
000117r 1 ;-----------------------------------------------------------------------
000117r 1 TESTDAT1:
000117r 1 90 3C 40 40 .byte $90,$3C,$40,$40,$40,$43,$40
00011Br 1 40 43 40
00011Er 1 TESTDAT2:
00011Er 1 90 3C 00 40 .byte $90,$3C,$00,$40,$00,$43,$00
000122r 1 00 43 00
000125r 1 QUIETMSG:
000125r 1 B0 78 00 B0 .byte $B0,$78,$00,$B0,$79,$00,$B0,$7B,$00
000129r 1 79 00 B0 7B
00012Dr 1 00
00012Er 1 B1 78 00 B1 .byte $B1,$78,$00,$B1,$79,$00,$B1,$7B,$00
000132r 1 79 00 B1 7B
000136r 1 00
000137r 1 B2 78 00 B2 .byte $B2,$78,$00,$B2,$79,$00,$B2,$7B,$00
00013Br 1 79 00 B2 7B
00013Fr 1 00
000140r 1 B3 78 00 B3 .byte $B3,$78,$00,$B3,$79,$00,$B3,$7B,$00
000144r 1 79 00 B3 7B
000148r 1 00
000149r 1 B4 78 00 B4 .byte $B4,$78,$00,$B4,$79,$00,$B4,$7B,$00
00014Dr 1 79 00 B4 7B
000151r 1 00
000152r 1 B5 78 00 B5 .byte $B5,$78,$00,$B5,$79,$00,$B5,$7B,$00
000156r 1 79 00 B5 7B
00015Ar 1 00
00015Br 1 B6 78 00 B6 .byte $B6,$78,$00,$B6,$79,$00,$B6,$7B,$00
00015Fr 1 79 00 B6 7B
000163r 1 00
000164r 1 B7 78 00 B7 .byte $B7,$78,$00,$B7,$79,$00,$B7,$7B,$00
000168r 1 79 00 B7 7B
00016Cr 1 00
00016Dr 1 B8 78 00 B8 .byte $B8,$78,$00,$B8,$79,$00,$B8,$7B,$00
000171r 1 79 00 B8 7B
000175r 1 00
000176r 1 B9 78 00 B9 .byte $B9,$78,$00,$B9,$79,$00,$B9,$7B,$00
00017Ar 1 79 00 B9 7B
00017Er 1 00
00017Fr 1 BA 78 00 BA .byte $BA,$78,$00,$BA,$79,$00,$BA,$7B,$00
000183r 1 79 00 BA 7B
000187r 1 00
000188r 1 BB 78 00 BB .byte $BB,$78,$00,$BB,$79,$00,$BB,$7B,$00
00018Cr 1 79 00 BB 7B
000190r 1 00
000191r 1 BC 78 00 BC .byte $BC,$78,$00,$BC,$79,$00,$BC,$7B,$00
000195r 1 79 00 BC 7B
000199r 1 00
00019Ar 1 BD 78 00 BD .byte $BD,$78,$00,$BD,$79,$00,$BD,$7B,$00
00019Er 1 79 00 BD 7B
0001A2r 1 00
0001A3r 1 BE 78 00 BE .byte $BE,$78,$00,$BE,$79,$00,$BE,$7B,$00
0001A7r 1 79 00 BE 7B
0001ABr 1 00
0001ACr 1 BF 78 00 BF .byte $BF,$78,$00,$BF,$79,$00,$BF,$7B,$00
0001B0r 1 79 00 BF 7B
0001B4r 1 00
0001B5r 1 ;----------------
0001B5r 1 ; END OF PROGRAM
0001B5r 1 ;----------------
0001B5r 1 .endproc
0001B5r 1
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