mirror of
https://github.com/cc65/cc65.git
synced 2024-11-19 21:32:19 +00:00
32 lines
776 B
ArmAsm
32 lines
776 B
ArmAsm
;
|
|
; 2019-09-20, Greg King
|
|
;
|
|
; unsigned char get_tv (void);
|
|
; /* Return the video mode the machine is using. */
|
|
;
|
|
|
|
.export _get_tv
|
|
|
|
.include "cx16.inc"
|
|
|
|
|
|
.proc _get_tv
|
|
php
|
|
sei ; Don't let interrupts interfere
|
|
|
|
; Point to the video output register.
|
|
|
|
stz VERA::CTRL ; Use port 0
|
|
lda #<VERA::COMPOSER::VIDEO
|
|
ldx #>VERA::COMPOSER::VIDEO
|
|
ldy #^VERA::COMPOSER::VIDEO
|
|
sta VERA::ADDR
|
|
stx VERA::ADDR+1
|
|
sty VERA::ADDR+2
|
|
|
|
lda VERA::DATA0
|
|
plp ; Re-enable interrupts
|
|
and #$07 ; Get the type of output signal
|
|
rts
|
|
.endproc
|