Fuller FD42 Keyboard

Discussions about Sinclair ZX80 and ZX81 Hardware
Tezz
Posts: 174
Joined: Thu Mar 09, 2017 8:28 pm

Re: Fuller FD42 Keyboard

Post by Tezz » Thu Jul 26, 2018 1:40 pm

Thanks for all the replies, I was originally thinking of having a board professionally made but going back to it now I think it should be relatively straight forward to hack one together with strip board sections and a couple of edge connectors. The stumbling block for me could be the vertical connector. I suppose I can epoxy that in place and connect everything with some jumper wires. Perhaps I could also add some brackets to nut and bolt the edge connectors together to make sure they withstand use.

Tezz
Posts: 174
Joined: Thu Mar 09, 2017 8:28 pm

Re: Fuller FD42 Keyboard

Post by Tezz » Thu Jul 26, 2018 1:42 pm

1024MAK wrote:
Thu Jul 26, 2018 7:42 am
If you ask PokeMon, he may be able to supply just the PCB from his extender (see here or search these forums). PokeMon is a member here.

I don't know how suitable it would be for the purpose that you want it for...

Mark
Thanks Mark the parts of the extender board should be perfect for the job.

Tezz
Posts: 174
Joined: Thu Mar 09, 2017 8:28 pm

Re: Fuller FD42 Keyboard

Post by Tezz » Sat Jul 28, 2018 1:14 pm

Hi all,

I've been chatting with Charles in a PM regarding the adapter where he mentioned his TAZ adapter. Charles made a suggestion to look at making a generic adapter with a flex ribbon cable so that it could be oriented in any computer case which sounds like a much better plan.

I did start to vector draw the original Fuller adapter last year prior to actually creating the PCB design in the software (which is all new to me)
pcb_wip.png
WIP Fuller adapter
With the Fuller case and it's internal vertical connector I suppose the adapter could be mounted that way with perhaps a plug in cable in the design to pass through to a second edge connector mounted on the back of the case to replicate the setup of the original adapter.

User avatar
gammaray
Posts: 487
Joined: Sun Apr 17, 2016 2:44 am
Location: Texas

Re: Fuller FD42 Keyboard

Post by gammaray » Sat Jul 28, 2018 2:50 pm

I would expect a thicker gauge ribbon necessary and maybe some others have some idea what exactly would be adequate for bus signals.

Personally I am looking at changing the the bus connector to a 2x25 female header instead of card edge and matching with a 2x25 shrouded or box male header connector for peripherals. (Mechanical forming of pins to match current card edge connector pin spacing would be needed)

Permanently soldering the 2x25 female to the main board is my planned conversion for one of my designpaths. But I can see stress on connecting and disconnecting joint may become a problem. Long term use will tell how reliable. I am also interested in determine if there is "rampack wobble" failure with this approach. I would expect none.
Finish what you start. Truth is over the mountaintop or six feet under.
4 x TS1000, 2 x TS1500 , 2 x timex 2040 printer, 1/2 x timex 2020 cassette deck, ZXPAND+AY, ZeddyNET, ZXBlast..., unfinished Spectrum...Still no life!

Tezz
Posts: 174
Joined: Thu Mar 09, 2017 8:28 pm

Re: Fuller FD42 Keyboard

Post by Tezz » Fri Oct 12, 2018 4:31 pm

Hi all,

Does anyone actually have the correct dimensions of the original Fuller extension board? I will look at making a card template at the weekend to try to judge the size using the photos for reference.

thanks,
Tezz :)

User avatar
gammaray
Posts: 487
Joined: Sun Apr 17, 2016 2:44 am
Location: Texas

Re: Fuller FD42 Keyboard

Post by gammaray » Sat Oct 20, 2018 5:24 am

Rectangular version of PCB
FD42 KEYBOARD adapter.jpg
Finish what you start. Truth is over the mountaintop or six feet under.
4 x TS1000, 2 x TS1500 , 2 x timex 2040 printer, 1/2 x timex 2020 cassette deck, ZXPAND+AY, ZeddyNET, ZXBlast..., unfinished Spectrum...Still no life!

Post Reply