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

From: Luke Crook <luke_at_balooga.com>
Date: Sun, 26 Feb 2012 08:11:18 -0800
Message-ID: <-382764972979151986@unknownmsgid>
Something like the Indivision ECS, but for the C64 would be great.



On Feb 26, 2012, at 7:40, Segher Boessenkool <segher@kernel.crashing.org> wrote:

>> 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 17:00:09

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