Files
open-roms/c64/kernal/screen/chrout_screen_gfxtxt.s
T

20 lines
255 B
ArmAsm

//
// GFX/TXT mode switch handling within CHROUT
//
chrout_screen_GFX:
lda VIC_YMCSB
and #$02 // to upper case
!:
sta VIC_YMCSB
jmp chrout_screen_done
chrout_screen_TXT:
lda VIC_YMCSB
ora #$02 // to lower case
bne !- // branch always