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38 lines
837 B
ArmAsm
38 lines
837 B
ArmAsm
;
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; Stefan Haubenthal, 2007-01-21
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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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.include "nes.inc"
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.include "get_tv.inc"
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.importzp tmp1, tmp2
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;--------------------------------------------------------------------------
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; _get_tv
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.proc _get_tv
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lda #TV::NTSC ; assume NTSC
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tax ; clear
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sta tmp1
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sta tmp2
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ldy tickcount
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wait: cpy tickcount
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beq wait
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iny ; next tick
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loop: cpy tickcount
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bne over
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inc tmp1
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bne loop
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inc tmp2
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bne loop
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over: ldy tmp2
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cpy #9
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bcc nopal
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lda #TV::PAL ; choose PAL
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nopal: rts
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.endproc
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