mirror of
https://github.com/erangell/A2NoSlotMIDI.git
synced 2024-06-12 21:29:38 +00:00
305 lines
17 KiB
Plaintext
305 lines
17 KiB
Plaintext
ca65 V2.13.3 - (C) Copyright 1998-2012 Ullrich von Bassewitz
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Main file : main.s
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Current file: main.s
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000000r 1 ;-------------------------------------------------------------------------
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000000r 1 ;
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000000r 1 ; main.s
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000000r 1 ; A2NoSlotMidi
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000000r 1 ;
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000000r 1 ; Created by Eric Rangell on 7/17/18.
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000000r 1 ;-------------------------------------------------------------------------
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000000r 1 ; APPLE MIDI DRIVER THROUGH ANNUNCIATOR 0
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000000r 1 ; Copyright © 1998-2018 Eric Rangell. MIT License.
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000000r 1 ;-------------------------------------------------------------------------
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000000r 1 ; THIS DRIVER IMPLEMENTS ASYNCHRONOUS SERIAL DATA TRANSMISSION
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000000r 1 ; THROUGH THE APPLE ANNUNCIATOR 0 OUTPUT PORT OF THE GAME CONNECTOR
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000000r 1 ; USING 32 CYCLES PER BIT TO ACHIEVE A 31.25K MIDI BAUD RATE.
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000000r 1 ;
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000000r 1 ; THE OUTPUT IS INITIALIZED TO A HIGH LOGIC VOLTAGE. WHEN IT GOES
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000000r 1 ; LOW FOR 32 MICROSECONDS, THAT INDICATES THE START BIT OF A MIDI BYTE.
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000000r 1 ; THEN 8 BYTES OF DATA ARE TRANSMITTED, FOLLOWED BY A HIGH STOP BIT.
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000000r 1 ; THE DATA BYTES REPRESENT MIDI MESSAGES WHICH CAN BE INTERPRETED BY
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000000r 1 ; ANY MUSICAL INSTRUMENT THAT IMPLEMENTS MIDI.
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000000r 1 ;
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000000r 1 ; ENTRY POINTS: (Note: Origin must be set in Makefile)
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000000r 1 ;
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000000r 1 ; $9000 = INITIALIZE - TURNS ON ANNUNCIATOR 0 - MUST BE CALLED ONCE
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000000r 1 ; $9003 = APPLESOFT CALL TO SEND ONE MIDI BYTE. POKE THE BYTE IN $9004.
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000000r 1 ; $9005 = ASSEMBLY CALL TO SEND ONE MIDI BYTE FROM ACCUMULATOR
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000000r 1 ; $9008 = APPLESOFT OR ASSEMBLY CALL TO SEND SEVERAL BYTES AT ONCE:
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000000r 1 ; THE CALLER POPULATES LOCATION $D7 WITH THE NUMBER OF BYTES TO BE
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000000r 1 ; TRANSMITTED, AND A POINTER IN $CE,CF (LO,HI) WITH THE ADDRESS OF
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000000r 1 ; THE DATA BYTES, THEN CALLS THE ENTRY POINT "SENDMSG" TO TRANSMIT
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000000r 1 ; THE MESSAGE.
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000000r 1 ; $900B = SEND A TEST MESSAGE - C MAJOR CHORD NOTE ONS
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000000r 1 ; $900E = SEND A TEST MESSAGE - C MAJOR CHORD NOTE OFFS
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000000r 1 ; $9011 = RESERVED
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000000r 1 ; $9014 = RESERVED
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000000r 1 ; $9017 = RESERVED
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000000r 1 ;-------------------------------------------------------------------------
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000000r 1 ; Enhancements for 2018:
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000000r 1 ; 1. Disable interrupts during critical timing sections, preserve interrupt status
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000000r 1 ; 2. Entry point to reconfigure program to use a different annunciator pair
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000000r 1 ; 3. Entry point to reconfigure program for hardware interface using inverters only (not buffers)
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000000r 1 ;-------------------------------------------------------------------------
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000000r 1 ; CALLER MUST POPULATE THE FOLLOWING TWO ZERO PAGE LOCATIONS FOR SENDMSG:
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000000r 1 NUMBYTES = $D7 ;NUMBER OF BYTES TO BE TRANSMITTED NOW (1-256)
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000000r 1 ; ;THE VALUE 0 WILL TRANSMIT 256 BYTES.
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000000r 1 DATAPTR = $CE ;POINTER TO THE BYTES TO BE TRANSMITTED NOW
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000000r 1 ;-------------------------------------------------------------------------
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000000r 1 AN0OFF = $C058 ;APPLE ADDRESSES THAT CONTROL ANNUNCIATOR OUTPUTS
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000000r 1 AN0ON = $C059 ;PROGRAM REFERNCES ARE RELATIVE TO AN0
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000000r 1 ;AN1OFF = $C05A
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000000r 1 ;AN1ON = $C05B
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000000r 1 ;AN2OFF = $C05C
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000000r 1 ;AN2ON = $C05D
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000000r 1 ;AN3OFF = $C05E
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000000r 1 ;AN3ON = $C05F
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000000r 1 ;-------------------------------------------------------------------------
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000000r 1 .proc main
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000000r 1 ;---------------------------------------------------------------------------
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000000r 1 START:
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000000r 1 4C rr rr JMP INIT ;MAIN ENTRY POINT - INITIALIZES ANNUNCIATORS
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000003r 1 SENDFP:
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000003r 1 A9 90 LDA #$90 ;ENTRY POINT FOR APPLESOFT: POKE BYTE AND CALL
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000005r 1 SENDONE:
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000005r 1 4C rr rr JMP XMITONE ;ENTRY POINT FOR TRANSMITTING ONE BYTE FROM ACCUM
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000008r 1 SENDMSG:
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000008r 1 4C rr rr JMP XMITMSG ;ENTRY POINT FOR TRANSMITTING A MIDI MESSAGE
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00000Br 1 ALLNOFF:
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00000Br 1 4C rr rr JMP QUIET ;TURN ALL NOTES OFF
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00000Er 1 TEST1:
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00000Er 1 4C rr rr JMP TESTMSG1 ;SEND TEST MESSAGE 1 - C MAJOR CHORD ON
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000011r 1 TEST2:
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000011r 1 4C rr rr JMP TESTMSG2 ;SEND TEST MESSAGE 2 - C MAJOR CHORD OFF
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000014r 1 ;
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000014r 1 ;RSRVD1:
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000014r 1 ;JMP INIT
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000014r 1 ;RSRVD2:
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000014r 1 ;JMP INIT
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000014r 1 ;RSRVD3:
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000014r 1 ;JMP INIT
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000014r 1 ;---------------------------------------------------------------------------
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000014r 1 00 SAVENBYT: .byte $00 ;SAVE AREA FOR NUMBYTES
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000015r 1 00 TEMPA: .byte $00
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000016r 1 00 TEMPX: .byte $00
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000017r 1 ;ANNPAIR: .byte $00 ; ANNUNCIATOR NUMBER TIMES 2 (1=C05A, 2=C05C, 3=C05E)
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000017r 1 ;---------------------------------------------------------------------------
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000017r 1 INIT:
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000017r 1 2C 59 C0 BIT AN0ON
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00001Ar 1 60 RTS
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00001Br 1 ;---------------------------------------------------------------------------
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00001Br 1 XMITMSG:
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00001Br 1 A5 D7 LDA NUMBYTES ;SAVE NUMBER OF BYTES
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00001Dr 1 8D rr rr STA SAVENBYT ;BECAUSE WE WILL CLOBBER IT
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000020r 1 A0 00 LDY #$00 ;Y WILL BE AN INDEX INTO THE DATA AREA
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000022r 1 XMITLOOP:
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000022r 1 B1 CE LDA (DATAPTR),Y ;GET A DATA BYTE
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000024r 1 20 rr rr JSR XMITONE
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000027r 1 C8 INY ;POINT TO NEXT BYTE
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000028r 1 C6 D7 DEC NUMBYTES ;DECREMENT COUNTER
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00002Ar 1 A5 D7 LDA NUMBYTES ;CHECK IF ZERO
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00002Cr 1 D0 F4 BNE XMITLOOP ;LOOP UNTIL DONE SENDING ALL BYTES
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00002Er 1 AD rr rr LDA SAVENBYT
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000031r 1 85 D7 STA NUMBYTES ;RESTORE ORIGINAL VALUE OF NUMBYTES
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000033r 1 60 RTS
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000034r 1 ;---------------------------------------------------------------------------
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000034r 1 XMITONE:
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000034r 1 8D rr rr STA TEMPA ;SAVE A AND X REGISTERS
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000037r 1 8E rr rr STX TEMPX
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00003Ar 1 ;
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00003Ar 1 0A ASL A ;SHIFT BIT INTO CARRY
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00003Br 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
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00003Cr 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
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00003Er 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
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000040r 1 8D rr rr STA BIT7+1 ;MODIFY THE XMITBITS SUBROUTINE
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000043r 1 8A TXA ;RESTORE ACCUMULATOR
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000044r 1 ;
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000044r 1 0A ASL A ;SHIFT BIT INTO CARRY
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000045r 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
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000046r 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
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000048r 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
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00004Ar 1 8D rr rr STA BIT6+1 ;MODIFY THE XMITBITS SUBROUTINE
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00004Dr 1 8A TXA ;RESTORE ACCUMULATOR
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00004Er 1 ;
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00004Er 1 0A ASL A ;SHIFT BIT INTO CARRY
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00004Fr 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
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000050r 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
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000052r 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
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000054r 1 8D rr rr STA BIT5+1 ;MODIFY THE XMITBITS SUBROUTINE
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000057r 1 8A TXA ;RESTORE ACCUMULATOR
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000058r 1 ;
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000058r 1 0A ASL A ;SHIFT BIT INTO CARRY
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000059r 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
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00005Ar 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
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00005Cr 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
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00005Er 1 8D rr rr STA BIT4+1 ;MODIFY THE XMITBITS SUBROUTINE
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000061r 1 8A TXA ;RESTORE ACCUMULATOR
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000062r 1 ;
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000062r 1 0A ASL A ;SHIFT BIT INTO CARRY
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000063r 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
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000064r 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
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000066r 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
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000068r 1 8D rr rr STA BIT3+1 ;MODIFY THE XMITBITS SUBROUTINE
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00006Br 1 8A TXA ;RESTORE ACCUMULATOR
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00006Cr 1 ;
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00006Cr 1 0A ASL A ;SHIFT BIT INTO CARRY
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00006Dr 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
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00006Er 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
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000070r 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
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000072r 1 8D rr rr STA BIT2+1 ;MODIFY THE XMITBITS SUBROUTINE
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000075r 1 8A TXA ;RESTORE ACCUMULATOR
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000076r 1 ;
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000076r 1 0A ASL A ;SHIFT BIT INTO CARRY
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000077r 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
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000078r 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
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00007Ar 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
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00007Cr 1 8D rr rr STA BIT1+1 ;MODIFY THE XMITBITS SUBROUTINE
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00007Fr 1 8A TXA ;RESTORE ACCUMULATOR
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000080r 1 ;
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000080r 1 0A ASL A ;SHIFT BIT INTO CARRY
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000081r 1 AA TAX ;SAVE CURRENT IMAGE OF DATA BYTE
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000082r 1 A9 00 LDA #$00 ;ZERO OUT ACCUMULATOR FOR ADD
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000084r 1 69 58 ADC #<AN0OFF ;ADD CARRY TO ANNUNCIATOR ADDRESS
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000086r 1 8D rr rr STA BIT0+1 ;MODIFY THE XMITBITS SUBROUTINE
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000089r 1 8A TXA ;RESTORE ACCUMULATOR
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00008Ar 1 ;
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00008Ar 1 20 rr rr JSR XMITBITS ;SEND THE BYTE OUT
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00008Dr 1 AE rr rr LDX TEMPX
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000090r 1 AD rr rr LDA TEMPA ;RESTORE X AND A
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000093r 1 60 RTS
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000094r 1 ;-----------------------------------------------------------------------
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000094r 1 XMITBITS:
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000094r 1 2C 58 C0 BIT AN0OFF ;4 CYCLES - TRANSMIT START BIT - ALWAYS LOW
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000097r 1 20 rr rr JSR DELAY22 ;6+22
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00009Ar 1 BIT0:
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00009Ar 1 2C 58 C0 BIT AN0OFF ;4
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00009Dr 1 20 rr rr JSR DELAY22 ;6+22
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0000A0r 1 BIT1:
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0000A0r 1 2C 58 C0 BIT AN0OFF ;4
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0000A3r 1 20 rr rr JSR DELAY22 ;6+22
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0000A6r 1 BIT2:
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0000A6r 1 2C 58 C0 BIT AN0OFF ;4
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0000A9r 1 20 rr rr JSR DELAY22 ;6+22
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0000ACr 1 BIT3:
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0000ACr 1 2C 58 C0 BIT AN0OFF ;4
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0000AFr 1 20 rr rr JSR DELAY22 ;6+22
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0000B2r 1 BIT4:
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0000B2r 1 2C 58 C0 BIT AN0OFF ;4
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0000B5r 1 20 rr rr JSR DELAY22 ;6+22
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0000B8r 1 BIT5:
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0000B8r 1 2C 58 C0 BIT AN0OFF ;4
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0000BBr 1 20 rr rr JSR DELAY22 ;6+22
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0000BEr 1 BIT6:
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0000BEr 1 2C 58 C0 BIT AN0OFF ;4
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0000C1r 1 20 rr rr JSR DELAY22 ;6+22
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0000C4r 1 BIT7:
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0000C4r 1 2C 58 C0 BIT AN0OFF ;4
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0000C7r 1 20 rr rr JSR DELAY22 ;6+22
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0000CAr 1 2C 59 C0 BIT AN0ON ;4 ;TRANSMIT STOP BIT - ALWAYS HIGH
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0000CDr 1 20 rr rr JSR DELAY22 ;6+22
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0000D0r 1 60 RTS
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0000D1r 1 ;-----------------------------------------------------------------------
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0000D1r 1 DELAY22:
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0000D1r 1 EA NOP ;WAIT 22 CYCLES
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0000D2r 1 EA NOP
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0000D3r 1 EA NOP
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0000D4r 1 EA NOP
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0000D5r 1 EA NOP
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0000D6r 1 EA NOP
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0000D7r 1 EA NOP
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0000D8r 1 EA NOP
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0000D9r 1 60 RTS
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0000DAr 1 ;-----------------------------------------------------------------------
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0000DAr 1 TESTMSG1:
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0000DAr 1 A9 07 LDA #7
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0000DCr 1 85 D7 STA NUMBYTES
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0000DEr 1 A9 rr LDA #<TESTDAT1
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0000E0r 1 85 CE STA DATAPTR
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0000E2r 1 A9 rr LDA #>TESTDAT1
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0000E4r 1 85 CF STA DATAPTR+1
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0000E6r 1 20 rr rr JSR SENDMSG
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0000E9r 1 60 RTS
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0000EAr 1 ;-----------------------------------------------------------------------
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0000EAr 1 TESTMSG2:
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0000EAr 1 A9 07 LDA #7
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0000ECr 1 85 D7 STA NUMBYTES
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0000EEr 1 A9 rr LDA #<TESTDAT2
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0000F0r 1 85 CE STA DATAPTR
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0000F2r 1 A9 rr LDA #>TESTDAT2
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0000F4r 1 85 CF STA DATAPTR+1
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0000F6r 1 20 rr rr JSR SENDMSG
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0000F9r 1 60 RTS
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0000FAr 1 ;-----------------------------------------------------------------------
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0000FAr 1 QUIET:
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0000FAr 1 A9 90 LDA #$90
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0000FCr 1 85 D7 STA NUMBYTES
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0000FEr 1 A9 rr LDA #<QUIETMSG
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000100r 1 85 CE STA DATAPTR
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000102r 1 A9 rr LDA #>QUIETMSG
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000104r 1 85 CF STA DATAPTR+1
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000106r 1 20 rr rr JSR SENDMSG
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000109r 1 60 RTS
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00010Ar 1 ;-----------------------------------------------------------------------
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00010Ar 1 TESTDAT1:
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00010Ar 1 90 3C 40 40 .byte $90,$3C,$40,$40,$40,$43,$40
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00010Er 1 40 43 40
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000111r 1 TESTDAT2:
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000111r 1 90 3C 00 40 .byte $90,$3C,$00,$40,$00,$43,$00
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000115r 1 00 43 00
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000118r 1 QUIETMSG:
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000118r 1 B0 78 00 B0 .byte $B0,$78,$00,$B0,$79,$00,$B0,$7B,$00
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00011Cr 1 79 00 B0 7B
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000120r 1 00
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000121r 1 B1 78 00 B1 .byte $B1,$78,$00,$B1,$79,$00,$B1,$7B,$00
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000125r 1 79 00 B1 7B
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000129r 1 00
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00012Ar 1 B2 78 00 B2 .byte $B2,$78,$00,$B2,$79,$00,$B2,$7B,$00
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00012Er 1 79 00 B2 7B
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000132r 1 00
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000133r 1 B3 78 00 B3 .byte $B3,$78,$00,$B3,$79,$00,$B3,$7B,$00
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000137r 1 79 00 B3 7B
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00013Br 1 00
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00013Cr 1 B4 78 00 B4 .byte $B4,$78,$00,$B4,$79,$00,$B4,$7B,$00
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000140r 1 79 00 B4 7B
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000144r 1 00
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000145r 1 B5 78 00 B5 .byte $B5,$78,$00,$B5,$79,$00,$B5,$7B,$00
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000149r 1 79 00 B5 7B
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00014Dr 1 00
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00014Er 1 B6 78 00 B6 .byte $B6,$78,$00,$B6,$79,$00,$B6,$7B,$00
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000152r 1 79 00 B6 7B
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000156r 1 00
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000157r 1 B7 78 00 B7 .byte $B7,$78,$00,$B7,$79,$00,$B7,$7B,$00
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00015Br 1 79 00 B7 7B
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00015Fr 1 00
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000160r 1 B8 78 00 B8 .byte $B8,$78,$00,$B8,$79,$00,$B8,$7B,$00
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000164r 1 79 00 B8 7B
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000168r 1 00
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000169r 1 B9 78 00 B9 .byte $B9,$78,$00,$B9,$79,$00,$B9,$7B,$00
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00016Dr 1 79 00 B9 7B
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000171r 1 00
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000172r 1 BA 78 00 BA .byte $BA,$78,$00,$BA,$79,$00,$BA,$7B,$00
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000176r 1 79 00 BA 7B
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00017Ar 1 00
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00017Br 1 BB 78 00 BB .byte $BB,$78,$00,$BB,$79,$00,$BB,$7B,$00
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00017Fr 1 79 00 BB 7B
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000183r 1 00
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000184r 1 BC 78 00 BC .byte $BC,$78,$00,$BC,$79,$00,$BC,$7B,$00
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000188r 1 79 00 BC 7B
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00018Cr 1 00
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00018Dr 1 BD 78 00 BD .byte $BD,$78,$00,$BD,$79,$00,$BD,$7B,$00
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000191r 1 79 00 BD 7B
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000195r 1 00
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000196r 1 BE 78 00 BE .byte $BE,$78,$00,$BE,$79,$00,$BE,$7B,$00
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00019Ar 1 79 00 BE 7B
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00019Er 1 00
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00019Fr 1 BF 78 00 BF .byte $BF,$78,$00,$BF,$79,$00,$BF,$7B,$00
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0001A3r 1 79 00 BF 7B
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0001A7r 1 00
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0001A8r 1 ;----------------
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0001A8r 1 ; END OF PROGRAM
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0001A8r 1 ;----------------
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0001A8r 1 .endproc
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0001A8r 1
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