Subject: VSYNC in 9 bytes From: "Edwin Blink" <edwin.blink@xxxxxxx> Date: Fri, 3 Sep 2004 00:59:54 +0200 |
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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