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optional patches to let MAME IIc+ emulation boot

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mgcaret 2017-11-26 20:59:56 -08:00
parent 0c442f1d46
commit 1c5a03e3ea
3 changed files with 28 additions and 0 deletions
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13
rom5x/options/mame/B0_C500_MAME_no_35_1.s Normal file
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; remove 3.5" functionality for MAME
; this bit causes slot 5 boot to go to do 6 boot instead
; and also overwrites the firmware protocol bits to not
; identify as a block device.
.code
.include "iic+.defs"
rompatch $c500,0,"MAME_no_35_1"
ldx #$00
lda #$c6
stx $00
sta $01
jmp ($00)
endpatch

8
rom5x/options/mame/B0_C5F8_MAME_no_35_2.s Normal file
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; remove 3.5" functionality for MAME
; this bit removes protocol converter initialization
; so the 3.5" drive code is never called
.code
.include "iic+.defs"
rompatch $c5f8,0,"MAME_no_35_2"
rts
endpatch

7
rom5x/options/mame/B0_C61A_MAME_no_35_3.s Normal file
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; remove 3.5" functionality for MAME
; this bit removes some 3.5" cruft added to the 5.25" boot code
.code
.include "iic+.defs"
rompatch $c61a,0,"MAME_no_35_3"
lda $c089,x
endpatch