Expansion plane project

Littlejohn · Post by **Littlejohn** » Sun Aug 31, 2008 10:55 pm

I got it fixed, and I think it looks great.

bestempty (Small).JPG: Expansion plane with sockets; (30.6 KiB) Downloaded 3519 times

bestsideconn (Small).JPG: Ready for future cards; (25.26 KiB) Downloaded 3521 times

Post by **RWAP** » Mon Sep 01, 2008 8:42 am

That looks highly professional and would be a welcome boon to many ZX81 users - would you be interested in making a batch of say, 30 for re-sale?

yerzmyey · Post by **yerzmyey** » Mon Sep 01, 2008 11:00 am

Erm... It seems like I don't get it.
These are 'female' connectors. But every interface has only a 'female' connector.
Shouldn't the connectors on the red board be 'male'?
Also I'm not sure if the interfaces could fit so closely, each other.
Maybe I just missed the idea.

sirmorris · Post by **sirmorris** » Mon Sep 01, 2008 3:47 pm

@yerz - Having a male conn. on the board would be difficult to arrange - the expansions would have to lie on top of each other.

This 'plane would be for a set of home-made boards. It would be most valuable if there was a basic 'experimenter' plug-in available..! Hint, hint

Littlejohn · Post by **Littlejohn** » Mon Sep 01, 2008 5:38 pm

RWAP wrote:That looks highly professional and would be a welcome boon to many ZX81 users - would you be interested in making a batch of say, 30 for re-sale?

This first batch had a mistake on the fingers. 18 of the 22 fingers, had vias in the center of them. On this board, I ground back the fingers to remove the vias and thus making it usable. I am having another batch made right now to correct this problem.
Then I will offer them for sale on this forum first.

sirmorris- What size/(dimensions) of Experimental board would be best?

yerzmyey · Post by **yerzmyey** » Mon Sep 01, 2008 6:31 pm

Ah. So that's not for existing interfaces...?
Well. Thx for the info, SirMorris.

sirmorris · Post by **sirmorris** » Tue Sep 02, 2008 11:18 am

Hmm. Large enough for 40-pin DILs, certainly. 8255s will be common additions..!

It would be nice to have the pins labelled. Maybe a small section (SMT parts?) for a common IO port decode circuit... Or design a new super one which offers flexibility?

Oh and the moon. On a stick, preferably

ksng36 · Post by **ksng36** » Tue Sep 02, 2008 1:29 pm

Say, Littlejohn, how long is your expansion interface? I like the color of the PCB. I get so tired of seeing green boards. It's nice to have a break!!

ksng36

Littlejohn · Post by **Littlejohn** » Tue Sep 02, 2008 4:56 pm

Measurements on the bare board are 2.75" X 5.5".

Littlejohn · Post by **Littlejohn** » Sat Sep 13, 2008 4:51 am

I now have these boards for sale. $40 + shipping.

You can email me at narguthru@yahoo.com to order.

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