Fuller FD42 Keyboard

Discussions about Sinclair ZX80 and ZX81 Hardware
Moggy
Posts: 1775
Joined: Wed Jun 18, 2008 2:00 pm

Re: Fuller FD42 Keyboard

Post by Moggy » Sat Jul 15, 2017 10:03 pm

Be careful with what you use to get rid of the pen marks, I occidentally dropped a blob of acetone on my space key and it dissolved the legend in a flash!

gozzo
Posts: 448
Joined: Fri Jul 08, 2011 8:52 pm

Re: Fuller FD42 Keyboard

Post by gozzo » Sat Jul 15, 2017 11:15 pm

never mind dissolve the legend....it'll dissolve the keycap eventually 😲

Tezz
Posts: 186
Joined: Thu Mar 09, 2017 8:28 pm

Re: Fuller FD42 Keyboard

Post by Tezz » Sat Jul 15, 2017 11:40 pm

That reminds me of working in the printing industry in the 80s... Acetone was used to clean the ink from the offset printers and after a long day one of the guys asked if I wouldn't mind quickly cleaning the artwork dept where I worked and I accidentally used a rag with acetone whilst cleaning an expensive laser printer wondering why it was totally sticky before suddenly realising that it was melting :)

Tezz
Posts: 186
Joined: Thu Mar 09, 2017 8:28 pm

Re: Fuller FD42 Keyboard

Post by Tezz » Fri Jul 21, 2017 12:54 am

I started carefully cleaning the keys tonight simply with water and bathroom cleaning products, happily it does just seem to be a regular felt pen used to write on the keys so they are all cleaning off easily.

I was looking at the photos of the expansion port extension that Fuller supplied with the 90 degree version. I'd really love to have one and convert my case to have that internal layout. The case has the holes marked for both orientations and so the version of the case supplied was cut out appropriately. I wonder if this was left for the end user to do as my case is quite crudely drilled and cut out? I guess I could think about recreating the expansion port extension if I could get accurate measurments. The photo in the other thread has an expansion of some sort insterted inside the case so I can't see the extension fully but I assume that there's a regular expansion port in a vertical position there which then passes through to the free port showing through the back of the case? Does anyone have photos of the extension without anything plugged into it?

thanks :)

User avatar
1024MAK
Posts: 2375
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: Fuller FD42 Keyboard

Post by 1024MAK » Fri Jul 21, 2017 2:10 am

That "extension" board sounds similar to the one you get in some dk'tronics cases.
If it is, all it is, is the PCB tracks wired to extend from an edge-connector socket to a "male" edge-connector on the edge of the PCB, plus, part way along, a PCB with another "male" edge-connector PCB. I forget now, but I think the main "extension" board has pins that the small PCB is soldered to.
The idea being that the Sinclair (or third party) 16k RAM pack can be inserted here, so that it is in the case ;)
I think the dk'tronics version is however smaller (the main "extension" board).

Mark

Tezz
Posts: 186
Joined: Thu Mar 09, 2017 8:28 pm

Re: Fuller FD42 Keyboard

Post by Tezz » Fri Jul 21, 2017 9:48 am

Hi Mark, that certainly sounds like the same design. It shouldn't be too difficult to reproduce at home aside from the two edge connectors. Perhaps the easiest way would be to have a one off PCB prototype professionally made.

I've cut out the part of the photo with the Fuller extension showing, I suppose the board that's plugged inside in the photo is most likely a 16K expansion.
expansion_port_extension.png
expansion_port_extension.png (612.53 KiB) Viewed 1900 times

User avatar
1024MAK
Posts: 2375
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: Fuller FD42 Keyboard

Post by 1024MAK » Fri Jul 21, 2017 12:45 pm

Here is a picture of a dk'tronics keyboard, case and expansion adapter:
Image
(photo from this web site: https://k1.spdns.de/Vintage/Sinclair/80 ... 0Keyboard/)

Mark

Tezz
Posts: 186
Joined: Thu Mar 09, 2017 8:28 pm

Re: Fuller FD42 Keyboard

Post by Tezz » Fri Jul 21, 2017 2:03 pm

Thanks Mark, that's helpful to see for reference. I'm not sure how to tackle the vertical internal edge connector, if that could be made as a separate part to attach to the main extension board manually I could then get a simple PCB manufactured. I'll start working on the layout in illustrator tonight to reproduce the Fuller extension. Does anyone possibly have the measurements?

Tezz
Posts: 186
Joined: Thu Mar 09, 2017 8:28 pm

Re: Fuller FD42 Keyboard

Post by Tezz » Sat Jul 22, 2017 8:24 pm

The case and keyboard cleaned up well :) I just need the expansion port extension now. I'm not sure whether to remove the sticker or glue it back down where it's lifted.

Fuller_FD42_2.png
(1.56 MiB) Downloaded 349 times
Fuller_FD42_1.png
(1.23 MiB) Downloaded 349 times

Here's a couple of photos of the back/side of the case where you can see that the ports are there to be cut out for either orientation of the board. If I can successfully make the extension I'll hot glue some black plastic inside the case over the other holes so that It could be reverted back.

Fuller_FD42_back.png
(501.77 KiB) Downloaded 349 times
Fuller_FD42_side.png
Fuller_FD42_side.png (566.33 KiB) Viewed 1853 times

User avatar
1024MAK
Posts: 2375
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: Fuller FD42 Keyboard

Post by 1024MAK » Sat Jul 22, 2017 8:35 pm

I use thin double sided tape carefully cut to size for fixing partly loose labels.

Mark

Post Reply