mirror of
https://github.com/cc65/cc65.git
synced 2024-07-05 06:28:57 +00:00
74 lines
1.2 KiB
PHP
74 lines
1.2 KiB
PHP
;
|
|
; Macros to disable and enable the ROM on Atari XL systems.
|
|
;
|
|
; Christian Groessler, chris@groessler.org, 19-Sep-2013
|
|
;
|
|
|
|
|
|
.ifdef __ATARIXL__
|
|
|
|
USEWSYNC= 1
|
|
|
|
.if USEWSYNC
|
|
.macro wsync
|
|
sta WSYNC
|
|
.endmacro
|
|
.else
|
|
.macro wsync
|
|
.endmacro
|
|
.endif
|
|
|
|
|
|
.macro disable_rom
|
|
lda PORTB
|
|
and #$fe
|
|
wsync
|
|
sta PORTB
|
|
lda #>__CHARGEN_START__
|
|
sta CHBAS
|
|
sta CHBASE
|
|
.endmacro
|
|
.macro disable_rom_quick
|
|
lda PORTB
|
|
and #$fe
|
|
sta PORTB
|
|
lda #>__CHARGEN_START__
|
|
sta CHBAS
|
|
sta CHBASE
|
|
.endmacro
|
|
.macro disable_rom_val val
|
|
lda val
|
|
wsync
|
|
sta PORTB
|
|
lda #>__CHARGEN_START__
|
|
sta CHBAS
|
|
sta CHBASE
|
|
.endmacro
|
|
|
|
.macro enable_rom
|
|
lda PORTB
|
|
ora #1
|
|
wsync
|
|
sta PORTB
|
|
lda #$E0
|
|
sta CHBAS
|
|
sta CHBASE
|
|
.endmacro
|
|
.macro enable_rom_quick
|
|
lda PORTB
|
|
ora #1
|
|
sta PORTB
|
|
lda #$E0
|
|
sta CHBAS
|
|
sta CHBASE
|
|
.endmacro
|
|
|
|
.else ; above __ATARIXL__, below not
|
|
|
|
.macro disable_rom
|
|
.endmacro
|
|
.macro enable_rom
|
|
.endmacro
|
|
|
|
.endif
|