Re: UD3 ROM on a 3032

From: Francesco Messineo <>
Date: Mon, 6 Feb 2017 19:00:46 +0100
Message-ID: <>
On Mon, Feb 6, 2017 at 6:54 PM, Marko Mäkelä <> wrote:

> There was an improved circuit board for a C2N232I that features a serial bus
> connector and in-circuit programming via the RS-232 interface. I never got
> around to completing the protocol translator for the serial bus. And
> nowadays there is sd2iec, so there is little motivation to continue.
> If I remember correctly, the ATtiny2313 is a drop-in replacement of the
> AT90S2313 when it comes to this circuit. There is a separate firmware that
> was adjusted for the software-side differences between the ATtiny2313 and
> AT90S2313.

yes I've seen the separate firmware, but I seem to remember that it
required a different xtal frequency and some pin changes. It has been
a while since I've studied that, so maybe I'm not remembering
correctly. I remember at one time I gave up with it since my preferred
target for transfering data between the C64 and the rest of the world
is one of my SX64s so, no tape port on it.

>> Sorry but the documentation about C2N232 could be a bit better maybe :)
> It is not a commercial product. :)

sure, I didn't want to imply that. It just seemed to me that was
abandoned more or less when ported to the tiny2313 maybe? I didn't
find a complete schematic of the new version IIRC.


       Message was sent through the cbm-hackers mailing list
Received on 2017-02-06 18:02:12

Archive generated by hypermail 2.2.0.