Re: USB-to-C64 ? (fwd)

From: Bryan Pope (
Date: 2001-11-27 17:28:59

Nicholas Coplin talks about doing a USB interface on his website at



> Dear Robert,
> I don't know of any USB related project for the Commodores.  But I don't
> think it's impossible; one could possibly find enough information in the
> USB driver source code of Linux or BSD systems, even if the relevant
> standard documents cannot be obtained at a reasonable cost.  Let's see if
> anyone on the cbm-hackers list warms up for this idea.
> I wouldn't try to interface the USB directly to a 6502-based processor;
> instead, I'd use a simple microcontroller that is better equipped for the
> task.  Along these lines, I'm developing a simple device that acts as an
> interface between the cassette port of any 8-bit Commodore and an RS-232
> asynchronous serial line.  With my custom protocol (for which the driver
> can be loaded using the standard cassette protocol), it transfers data at
> 38400 bps.
> Alas, I've heard that USB has a complicated protocol stack that might be
> too big to fit in a small microcontroller.  I don't know if this is true.
> Also, implementing a file system (which would be required in the
> application you are suggesting) is no trivial task.  I guess the
> microcontroller would need several kilobytes of memory for buffering data
> and several dozens of kilobytes of program code memory.
> 	Marko
> ---------- Forwarded message ----------
> Date: Tue, 27 Nov 2001 09:57:15 -0600
> From: Robert Eaglestone <>
> To:
> Subject: USB-to-C64 ?
> Greetings Mr. Makela:
> I've been browsing the web, looking for someone who has
> thought about creating a protocol translator that could make
> a USB mass storage device look like a 1541 (or a group of
> 1541's).
> I've also been looking for the protocol standard used by
> the C64 to talk with the 1541, without success.
> Perhaps you know of someone who has figured out if such
> a project can or can't be done.  Or perhaps you know
> someone who would know if it could be done.  If you
> know of such people, could you let me know?  I am very
> curious about it (if only because my 1541-II is not getting
> any younger).
> Sincerely,
> Robert Eaglestone
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