Re: [stella] VSYNC in 9 bytes

Subject: Re: [stella] VSYNC in 9 bytes
From: Chris Wilkson <ecwilkso@xxxxxxx>
Date: Thu, 2 Sep 2004 19:13:23 -0400 (EDT)
Very clever.  I like it!

-Chris

On Fri, 3 Sep 2004, Edwin Blink wrote:

> I've been bytebusting a lot in keeping my menu I'm doing as(mall)ap and
> just had one of those bright moments. Just needed to share this with you
> guys:
>
> ;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
>
>
>
>
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