Very nice! I've updated the standard MACRO.H file to use this new method.
http://www.atari2600.org/dasm
Cheers
A
----- Original Message -----
From: "Edwin Blink" <edwin.blink@xxxxxxx>
To: <stella@xxxxxxxxxxxxxxxxxx>
Sent: Friday, September 03, 2004 8:59 AM
Subject: [stella] VSYNC in 9 bytes
> 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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