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lemm: get music working on IIc

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This commit is contained in:
Vince Weaver 2022-04-13 21:35:48 -04:00
parent 76810c1863
commit df1980d214
2 changed files with 10 additions and 48 deletions
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4
games/lemm/pt3_lib_mockingboard_detect.s
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@ -45,7 +45,7 @@ mockingboard_detect:
; it difficult if you actually wanted to use any
; Applesoft/Monitor ROM routines
.ifdef PT3_ENABLE_APPLE_IIC
;.ifdef PT3_ENABLE_APPLE_IIC
lda APPLEII_MODEL
cmp #'C'
bne not_iic
@ -56,7 +56,7 @@ mockingboard_detect:
sta MOCK_6522_DDRA1 ; $C403
sta MOCK_6522_T1CL ; $C404
.endif
;.endif
not_iic:
lda #$00

54
games/lemm/pt3_lib_mockingboard_setup.s
View File

@ -172,57 +172,19 @@ mockingboard_setup_interrupt:
; for this game with things in language card including
; irq handler, always force IIc mode
; irq handler, always force IIc mode (where RAM swapped in
; and we put the irq handler address directly up at $FFFE)
;.ifdef PT3_ENABLE_APPLE_IIC
; lda APPLEII_MODEL
; cmp #'C'
; bne done_iic_hack
; bypass the firmware interrupt handler
; should we do this on IIe too? probably faster
; first we have to copy the ROM to the language card
.if 0
sei ; disable interrupts
copy_rom_loop:
lda $c089 ; read ROM, write RAM1
lda $c089
ldy #0
read_rom_loop:
lda $D000,Y
sta $400,Y ; note this uses text page as
; temporary data store
iny
bne read_rom_loop
lda $c08B ; read/write RAM1
lda $c08B ;
write_rom_loop:
lda $400,Y
sta $D000,Y
iny
bne write_rom_loop
inc read_rom_loop+2
inc write_rom_loop+5
bne copy_rom_loop
.endif
lda #<interrupt_handler
sta $fffe
lda #>interrupt_handler
sta $ffff
; nop out the "lda $45" in the irq handler
; nop out the "lda $45" since we are bypassing the ROM irq handler
; that puts A in $45
lda #$EA
sta interrupt_smc
sta interrupt_smc+1
;.endif
done_iic_hack:
;=========================
@ -231,10 +193,10 @@ done_iic_hack:
; Vector address goes to 0x3fe/0x3ff
; FIXME: should chain any existing handler
lda #<interrupt_handler
sta $03fe
lda #>interrupt_handler
sta $03ff
; lda #<interrupt_handler
; sta $03fe
; lda #>interrupt_handler
; sta $03ff
;============================
; Enable 50Hz clock on 6522