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try detecting MB4C in slot 4 before slot 5

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This commit is contained in:
Peter Ferrie 2025-02-03 17:24:24 -08:00
parent 506453883b
commit b6eb1e7fcd
1 changed files with 8 additions and 10 deletions

18
src/hw.mockingboard.a

@ -58,21 +58,19 @@ GetMockingboardStuff
bpl -
lda $C405
cmp #$38
bne @not_mouse
lda $C407
cmp #$18
beq @use_slot5 ; looks like the mouse
@not_mouse
stx $C403 ; enable Mockingboard 4C support in slot 4
ldy $C407
stx $C403 ; try enable Mockingboard 4C support in slot 4
stx $C404
bne @not_iic ; always
@use_slot5
cmp $C405
bne @ok_mb ; changed, maybe worked
cpy $C407
bne @ok_mb ; changed, maybe worked
stx $C503 ; try enable Mockingboard 4C support in slot 5 instead
stx $C504
@ok_mb
@not_iic
lda #$00
sta $80