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