Date   : Wed, 29 Mar 2006 22:54:55 +0100
From   : Fragula <fragula@...>
Subject: STL DFDCs - Was: Model B NMI PITA.

Hi Eelco!

Eelco Huininga wrote:

> I've got the Mk1, and I worked out the schematics a long time ago. You
> wouldn't happen to have the Mk2 schematics, do you?
LOL! I just two minutes ago reinstalled it! :'D

I'll pop it out again and scan it. I don't have schematics, but its not
a terribly complicated board. Guessing the bits beneath the chips just
makes it more interesting.

> It would be nice to see what the differences between the two are :-)
Indeed. As I (possibly mis)understand it, the Mk1 came out before the
Acorn 1770 board, which either had the address lines on the 1770
reversed, or the "extra register" bits reversed. The DFDC Mk2 is 100%
compatible with Acorn DFS/Acorn 1770 DFS and ADFS.

And... <roll of drums> (assuming it hasn't caught fire (again) by the
time I got back and check on it) I now have *one* Econet+DFDC'd Model B.
I just wish I knew why, so I could do it to the other one too. :-/

And tomorrow, I get my new glasses! :-D

Cheers!

M.