Re: [stella] VDELPx

Subject: Re: [stella] VDELPx
From: Christopher Tumber <christophertumber@xxxxxxxxxx>
Date: Wed, 15 Jan 2003 00:11:35 -0500
>Can I trust z26 (2.) here?

Yes.

Running the following on my Supercharger:

      sta WSYNC
      lda #1
      sta VDELP0
      lda #255
      sta GRP0
      lda #0
      sta VDELP0
      lda #128+32+8+2
      sta GRP0
      lda #1
      sta VDELP0
      sta WSYNC
      sta WSYNC
      sta WSYNC
      sta WSYNC
      sta WSYNC
      sta WSYNC
      sta WSYNC
      sta WSYNC
      sta WSYNC
      sta WSYNC


Displays nothing (In a standard kernal type loop, having set COLUP0 and positioned player0 with RESP0. And just to be sure, commenting out the VDELP0 references DOES produce a vertical bar)

It's like a primitive double buffering...

Wow.

Chris...

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