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/***************************************************************************
psiddrv.a65 - C64 Sid Player
-------------------
begin :
copyright : (C) 2000 by Dag Lem
email : resid@nimrod.no
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
/***************************************************************************
* Modified by Simon White <sidplay2@email.com> for use in the sidplayer
* SIDPlay2.
*
* Build with:
* xa -R -G psiddrv.a65 -o psiddrv.o65
* od -v -An -w8 -tx1 psiddrv.o65 | sed 's/\w\w/0x&,/g' > psiddrv.bin
***************************************************************************/
/***************************************************************************
* $Log: psiddrv.a65,v $
* Revision 1.16 2002/12/13 22:04:54 s_a_white
* Nolonger CLI after returning from INIT for RSID tunes. Since the tunes are
* more complicated rely on the init to do the right thing.
*
* Revision 1.15 2002/11/20 21:43:08 s_a_white
* Enable the VIC screen and therefore DMA.
*
* Revision 1.14 2002/11/19 22:53:23 s_a_white
* Sidplay1 modes modified to make them nolonger require the psid driver.
*
* Revision 1.13 2002/11/01 17:36:01 s_a_white
* Frame based support for old sidplay1 modes.
*
* Revision 1.12 2002/10/20 08:59:14 s_a_white
* Prevent some PSID tunes being handled like RSID ones.
*
* Revision 1.11 2002/10/02 19:42:59 s_a_white
* RSID support.
*
* Revision 1.10 2002/09/21 22:32:18 s_a_white
* Prevent some of the real c64 only tunes abusing play != 0. Some busy
* looping ones may still get away with it...
*
* Revision 1.9 2002/09/12 20:39:47 s_a_white
* Added support for simulating the random delay before the user loads a
* program on a real C64.
*
* Revision 1.8 2002/03/12 18:45:37 s_a_white
* Added PHP to push stack as sidplay1 compatibility IRQ now behaves like
* JSR.
*
* Revision 1.7 2002/02/17 12:35:35 s_a_white
* BRK handler clean up and better sidplay2 optimisation usage.
*
* Revision 1.6 2002/02/05 08:48:58 s_a_white
* Small fix for psid specific rips and real irq handlers (A reg now zeroed).
*
* Revision 1.5 2002/02/04 23:50:48 s_a_white
* Improved compatibilty with older sidplay1 modes.
*
* Revision 1.4 2001/12/17 23:43:29 s_a_white
* Fix for real C64 tunes where BRK handler is run.
*
* Revision 1.3 2001/10/02 18:05:27 s_a_white
* Fix for real C64 tunes which correctly handle BRK.
*
* Revision 1.2 2001/09/01 11:12:22 s_a_white
* Fixes sidplay1 environment modes.
*
* Revision 1.1 2001/07/27 12:12:23 s_a_white
* Initial release.
*
***************************************************************************/
; entry address
coldvec .word cold
; redirect basic restart vector
; to finish the init sequence
finitvec .word setiomap
; initial user interrupt vectors
retusr .word irqret
.byte 0
irqusr .word irqret
brkusr .word brkjob
nmiusr .word nmijob
playnum .byte 0
speed .byte 0
initvec .word 0
playvec .word 0
rndwait .word 0
initiomap .byte 0
playiomap .byte 0
; init/play PSID
play jmp (playvec)
init jmp (initvec)
; cold start
cold sei
; set CIA Timer A to 60Hz
lda $02a6
beq ntsc
pal lda #$25
ldx #$40
bne timer
ntsc lda #$95
ldx #$42
timer sta $dc04
stx $dc05
; enable the VICs screen
lda $d011
ora #$10
sta $d011
; 0 indicates VIC timing, else it's from CIA
ldx #$81
lda speed
bne ciainit
; enable VICII raster interrupt
stx $d01a
beq doinit
; enable CIA 1 timer A interrupt
ciainit stx $dc0d
; always enable timer A for random numbers
doinit lda #$01
sta $dc0e
; If play address, override default irq vector so
; we reach are routine to handle play routine
lda playiomap
beq noplay
lda #<irqjob
sta $0314
; set I/O map and call song init routine
noplay lda initiomap
bne setbank
; Only release interrupt mask for real
; C64 tunes (initiomap = 0) thus
; providing a more realistic environment
lda #$37
; cli dosen't come into effect until
; after the sta!
cli
setbank sta $01
; simulate time before user loads tune
random tya
ldx rndwait
ldy rndwait+1
inx
iny
wait dex
bne wait
dey
bne wait
tay
; get song number
getsong ldx playnum
dex
txa
ldx #0
ldy #0
jsr init
setiomap lda initiomap
beq idle
lda playiomap
beq run
lda #$37
sta $01
bne run
brkjob ldx #$ff
txs
run cli
idle jmp idle
irqjob lda $01
pha
lda playiomap
sta $01
lda #0
jsr play
pla
sta $01
inc $d019
; IRQ Exit (code from Kernel ROM)
irqret lda $dc0d
pla
tay
pla
tax
pla
nmijob rti
.end
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