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cc65/libsrc/cx16/get_tv.s

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;
; 2020-05-02, Greg King
;
; unsigned char get_tv (void);
; /* Return the video mode the machine is using. */
;
.export _get_tv
.include "cx16.inc"
.proc _get_tv
stz VERA::CTRL ; Use display register bank 0
lda VERA::DISP::VIDEO
and #%00000111 ; Get the type of output signal
ldx #>$0000 ; Promote to unsigned int
rts
.endproc