+
+ .include "atari.inc"
+ .import __CHARGEN_START__
+ .segment "LOWCODE"
+.macro disable_rom
+ pha
+ lda PORTB
+ and #$fe
+ sta PORTB
+ lda #>__CHARGEN_START__
+ sta CHBAS
+ sta CHBASE
+ pla
+.endmacro
+.macro enable_rom
+ lda PORTB
+ ora #1
+ sta PORTB
+ lda #$E0
+ sta CHBAS
+ sta CHBASE
+.endmacro
+
+.else ; above atarixl, below atari
+
+.macro disable_rom
+.endmacro
+.macro enable_rom
+.endmacro
+