C2N232

Hi Frank,

On Mon, Feb 06, 2017 at 07:00:46PM +0100, Francesco Messineo wrote:
>On Mon, Feb 6, 2017 at 6:54 PM, Marko Mäkelä <msmakela@gmail.com> wrote:
>>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.

The newest firmware in 
http://www.ktverkko.fi/~msmakela/8bit/c2n232/firmware/ appears to be 
c2n232c-5.zip which supports both the ATtiny2313 at 18.432 MHz and the 
AT90S2313 at 8 MHz.

The latest circuit board version was designed and manufactured by 
Nicolas Welte. The circuit board was a bit longer than the last one that 
I designed, to avoid any shortening of the plastic case (25-pin to 9-pin 
D connector housing). There was a serial bus DIN connector in the middle 
of the circuit board.

I think that the older circuit board versions should work equally well; 
just replace the microcontroller and the crystal.

>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 got a family and left the academic world in 2003, and after that I did 
not find that much time for hobbies.

>I didn't find a complete schematic of the new version IIRC.

I cannot find the schematic or circuit board layout either. But it 
really is very straightforward.

	Marko

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