Re: has anybody tried to replace a vic or vic II chip with a board containing a propeller ?

From: Gerrit Heitsch <>
Date: Sun, 26 Feb 2012 17:33:28 +0100
Message-ID: <>
On 02/26/2012 04:36 PM, Segher Boessenkool wrote:
> The biggest problem in faithfully emulating a VIC-II on a CPU is
> the pixel logic: 8M times per second you need to combine the eight
> sprites and the video matrix using the multi-colour and priority
> regs, select which colour to display, and update the sprite
> collision registers. Everything else requires much less bandwidth:
> if you have no sprites at all on the video chip you're emulating,
> it's much easier.

Hm, I would have expected another big problem to be the emulation of the 
tricks of the VIC-II that are a sideeffect of the logic used in it. I 
mean opening the border and other 'undcoumented' features.


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Received on 2012-02-26 17:00:25

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