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Acorn Atom on Eurocard

Posted: Sun Jul 15, 2018 4:18 pm
by bprosman
Following Rolands 2K18 discussion, built his previous model I was wondering if there would be interest in building an Atom on 19" Eurocard boards.
New meets old.. using the 6847 (No godil) but a PS/2 keyboard interface.
Split over maybe multiple boards, and for the Glue Logic I want to use the EPM3064 (44 pin plcc) on small adapter boards.
You still can get them pretty easy on Ebay.

Just thoughts.

Kind regards, Bram

Re: Acorn Atom on Eurocard

Posted: Mon Jul 16, 2018 3:22 pm
by Kazzie
If you choose to go ahead with this, I have a number of NOS 2x32-way type b DIN41612 connectors to hand. I've got several right-angle male connectors for your card, and some straight-through females for your backplane. Even after keeping some behind for my (theretical) System 1 to System2/3/4/5 conversion, I have some spare.

Re: Acorn Atom on Eurocard

Posted: Mon Jul 16, 2018 5:23 pm
by Multiwizard
Hi Bram,

you should contact Theo Waaijer.

Many years ago he tried to make one, but he did run into some difficulties.


Greetings, Wim... :-)

Re: Acorn Atom on Eurocard

Posted: Mon Jul 16, 2018 5:59 pm
by bprosman
Let me contact him .

Re: Acorn Atom on Eurocard

Posted: Wed Jul 18, 2018 4:00 pm
by Kazzie
In case you don't happen to look at the "Worth Taking a Look At" thread, I've posted about an auction of Eurocard racking that could be useful:

viewtopic.php?f=8&t=2506&p=208970#p208970

I hope you're a little closer than I am!

Re: Acorn Atom on Eurocard

Posted: Wed Jul 18, 2018 9:57 pm
by Prime
bprosman wrote:
Sun Jul 15, 2018 4:18 pm
Following Rolands 2K18 discussion, built his previous model I was wondering if there would be interest in building an Atom on 19" Eurocard boards.
New meets old.. using the 6847 (No godil) but a PS/2 keyboard interface.
Split over maybe multiple boards, and for the Glue Logic I want to use the EPM3064 (44 pin plcc) on small adapter boards.
You still can get them pretty easy on Ebay.
You've pretty much just described my AtomClone from 2009 :) Except that I was using Xilinx XC95xx series chips as glue logic. Had a 40 pin AVR on there doing PS/2 -> Crosspoint switch for the keyboard, along with AtoMMC.

I'd certainly considder releasing the design files as a starting point, should not be too hard to port to another CPLD series, and update with stuff like colour video, floppies etc.

Cheers.

Phill.

Re: Acorn Atom on Eurocard

Posted: Wed Jul 18, 2018 10:35 pm
by bprosman
Hi Phil,

Would love to see your files as a starting/inspiration point. Especially the keyboard stuff.
The AtomMMC definitively will be included.

Colour video is a wish but not sure what workable options there are if I want to go Godil-less

Kind regards, Bram

Re: Acorn Atom on Eurocard

Posted: Thu Jul 19, 2018 6:54 pm
by roland
Bram,

You should definitively visit an ABUG meeting where you can see a rack Atom :) . Furthermore I have a board and an AVR for connecting a ps/2 keyboard to the 7447 and 8255. And as soons as my holidays start I will investigate an alternative for the godil. You may also benefit from that....

Greetz, Roland

Re: Acorn Atom on Eurocard

Posted: Mon Aug 20, 2018 11:59 am
by bprosman
For those knowing their classics might recognize my (partial) Kicad drawing :wink:
AcornAtom.JPG