Re: Commodore 64 Ultimate Cartridge project

From: Gábor Lénárt <>
Date: Mon, 7 May 2012 18:31:17 +0200
Message-ID: <>

On Mon, May 07, 2012 at 06:25:29PM +0200, Michał Pleban wrote:
> >I also thought about it, since I've started to play with interfacing with SD
> >card on SPI bus, currently only through PC parallel port (to "play" with it
> >and some studies for myself), but I'd use a microcontroller with dedicated
> >SPI capability (btw, I also thought about using ECN28J60 which is a 28-pin
> >SPDIP ethernet controller with SPI bus - it's really cheap, and not so slow,
> >even 20MHz SPI connection is OK for it -, maybe easier to play with it for a
> >hobby user like me, without heavy SMD, etc soldering and PCB designing
> >capaibilities).  One question came into my mind however: I would hate to use
> >an EPROM just for bootstrap.  It would be interesting to see this works:
> Well, I don't want to use any microcontroller for the simple reason
> that 6502 is the only processor I know how to program :-P

I can understand you :) My only reason: interfacing with SPI bus is not so
fast if some "bit banging" is used, and I wanted decent performance mainly
because of the SPI based ethernet controller. However I am thinking on this
still, as maybe serial shift register of the CIA can help here to speed
things up a bit. In my idea uC is only needed to have some kind of fast
SPI/serial converter (and also to "cache" some data inside the uC's memory
still C64 is ready to process it, etc).

However as far as I can see, the goals are a "bit" different, you may not
need this at all.

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Received on 2012-05-07 17:00:59

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