Re: Commodore 64 Ultimate Cartridge project

From: Michał Pleban <>
Date: Mon, 07 May 2012 19:00:27 +0200
Message-ID: <>

Groepaz wrote:

> i would strongly advice not to use the 6510 for bitbanging - since that is
> dead slow. look at what speed the mmc64 can offer, it has a small spi
> controller with 8mhz spi clock (so one byte can be transfered each c64 cycle),
> and also uses a huge unrolled loop to read a sector from sd card. this is
> quite ok speed, but already on the slowish side of things. with bitbanging it
> would be at least 10 times slower, if not more - and unrolling loops would be
> out of the question because codesize would explode.

Hmmm, maybe a hardware TTL shift register then?

Are you able to estimate the data transfer rate of MMC64 with this 8MHz 


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Received on 2012-05-07 17:01:27

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