Re: [stella] VSYNC in 9 bytes

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Re: [stella] VSYNC in 9 bytes

Subject: Re: [stella] VSYNC in 9 bytes
From: Manuel Rotschkar <cybergoth@xxxxxxxx>
Date: Fri, 03 Sep 2004 03:28:49 +0200

Hi there!

;generates vertical sync pulse for 3 full scanlines.
;VBLANK should be set by the overscan code and is not set here

    LDA    #$0E    ;each '1' bits generate a VSYNC ON line (bits 1..3)
VSLP1    STA    WSYNC    ;1st '0' bit resets Vsync, 2nd '0' bit exit loop
    STA VSYNC
    LSR
    BNE    VSLP1    ;branch until VYSNC has been reset

Wow! Heya, this should asap replace the current VERTICAL_SYNC makro implementation! :-)

Greetings,
	Manuel

Current Thread
VSYNC in 9 bytes Edwin Blink - 2 Sep 2004 22:59:23 -0000 Chris Wilkson - 2 Sep 2004 23:13:24 -0000 Manuel Rotschkar - 3 Sep 2004 01:30:05 -0000 <= Andrew Davie - 3 Sep 2004 01:50:24 -0000 Aaron - 3 Sep 2004 06:16:53 -0000 Edwin Blink - 3 Sep 2004 07:04:15 -0000

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