188 lines
3.9 KiB
Plaintext
188 lines
3.9 KiB
Plaintext
; ELECTRIC DUET MUSIC PLAYER FOR THE MOCKINGBOARD
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; COPYRIGHT 2014 CYBERNESTO
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;
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; This program is free software; you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation; either version 2 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program; if not, write to the
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; Free Software Foundation, Inc.,
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; 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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;
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; -----------------------------------------------------------------------------
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;
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; changes to original (by 4am):
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; - fixes for stereo output
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; - labels for slot independence (see million.init.a)
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; - MBCHECKKEY to check against a list of keys that will exit
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;
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CHN = $1D
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SONG = $1E
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LEFTCHN = $00
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RIGHTCHN = $02
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ENAREG = $07
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VOL_A = $08
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VOL_B = $09
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TONE = $06
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DURATION = $08
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!align $FF,0,0 ; align to page
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MockingDuet
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JSR INIT
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JSR RESET
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JSR ENACHN
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JMP MBLOOP
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SETVOL
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MBNEXT LDA SONG
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CLC
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ADC #$03
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STA SONG
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BCC MBLOOP
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INC SONG+1
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MBLOOP LDY #$00
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LDA (SONG),Y
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CMP #$01
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BEQ SETVOL
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BPL SETNOTE ;SET DURATION
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MBEND JSR RESET
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RTS
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MBCHECKKEY
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ldy #0
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MBCHECK lda ($EE), y
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beq MBCONTINUE
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bpl MBEND
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iny
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cmp $C000
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beq MBEND
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bne MBCHECK ; always branches
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MBCONTINUE
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bit $C010
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jmp MBNEXT
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SETNOTE STA DURATION
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LDA #LEFTCHN
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MBSEND STA CHN
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MBSLOT01 STA $C401
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MBSLOT02 STA $C481
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JSR SETREG1
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INY
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LDA (SONG),Y
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BEQ MBSKIP ;IF 0 KEEP LTTSA
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JSR CONVFREQ
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MBSKIP LDA TONE
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MBSLOT03 STA $C401
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MBSLOT04 STA $C481
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JSR WRDATA1
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INC CHN
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LDA CHN
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MBSLOT05 STA $C401
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MBSLOT06 STA $C481
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JSR SETREG1
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LDA TONE+1
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MBSLOT07 STA $C401
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MBSLOT08 STA $C481
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JSR WRDATA1
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LDA #RIGHTCHN
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STA CHN
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CPY #$02
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BNE MBSEND
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LDX DURATION
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W1 LDY TEMPO
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W2 DEC TEMP
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BNE W2
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DEY
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BNE W2
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DEX
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BNE W1
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BIT $C000
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MBKEYBRANCH
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BMI MBCHECKKEY
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JMP MBNEXT
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CONVFREQ LDX OCTAVE
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INX
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PHA
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LDA #$00
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STA TONE+1
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PLA
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DECOCT DEX
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BMI LOBYTE
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ASL
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ROL TONE+1
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JMP DECOCT
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LOBYTE STA TONE
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RTS
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RESET LDA #$00
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MBSLOT09 STA $C400
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MBSLOT10 STA $C480
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LDA #$04
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MBSLOT11 STA $C400
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MBSLOT12 STA $C480
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RTS
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INIT LDA #$FF
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MBSLOT13 STA $C403
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MBSLOT14 STA $C483
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LDA #$07
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MBSLOT15 STA $C402
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MBSLOT16 STA $C482
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RTS
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SETREG1 LDA #$07
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MBSLOT17 STA $C400
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MBSLOT18 STA $C480
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LDA #$04
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MBSLOT19 STA $C400
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MBSLOT20 STA $C480
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RTS
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WRDATA1 LDA #$06
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MBSLOT21 STA $C400
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MBSLOT22 STA $C480
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LDA #$04
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MBSLOT23 STA $C400
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MBSLOT24 STA $C480
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RTS
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ENACHN LDA #ENAREG
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MBSLOT25 STA $C401
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MBSLOT26 STA $C481
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JSR SETREG1
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LDA #%00111100
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MBSLOT27 STA $C401
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MBSLOT28 STA $C481
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JSR WRDATA1
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LDA #VOL_A
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MBSLOT29 STA $C401
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MBSLOT30 STA $C481
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JSR SETREG1
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LDA #$0D
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MBSLOT31 STA $C401
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MBSLOT32 STA $C481
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JSR WRDATA1
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LDA #VOL_B
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MBSLOT33 STA $C401
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MBSLOT34 STA $C481
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JSR SETREG1
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LDA #$0D
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MBSLOT35 STA $C401
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MBSLOT36 STA $C481
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JSR WRDATA1
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RTS
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OCTAVE !byte 1
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TEMPO !byte 8
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TEMP !byte 0
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