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

From: Segher Boessenkool <segher_at_kernel.crashing.org>
Date: Sun, 26 Feb 2012 16:36:19 +0100
Message-Id: <FC1746D3-E204-4C47-975E-6670A364F1C5@kernel.crashing.org>
> Has any body tried to emulate one of the commodore video chip with  
> a propeller ?
>
> I guess itís fast enough for the cbm8000Ö
> No idea for the vic 1 or vic 2

Not with a propeller, but with a fairly more powerful chip.  It
can be done but isn't easy.

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.


Segher


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Received on 2012-02-26 16:00:09

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