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cc65/libsrc/cx16/set_tv.s

31 lines
714 B
ArmAsm

;
; 2019-11-06, Greg King
;
; void __fastcall__ set_tv (unsigned char);
; /* Set the video mode the machine will use. */
;
.export _set_tv
.include "cx16.inc"
.proc _set_tv
php
sei ; Don't let interrupts interfere
; Point to the video output register.
stz VERA::CTRL ; Use port 0
ldx #<VERA::COMPOSER::VIDEO
ldy #>VERA::COMPOSER::VIDEO
stx VERA::ADDR
sty VERA::ADDR+1
ldx #^VERA::COMPOSER::VIDEO
stx VERA::ADDR+2
sta VERA::DATA0
plp ; Re-enable interrupts
rts
.endproc