I released my ZX81+35 ZX-81 clone design files on Github

Discussions about Sinclair ZX80 and ZX81 Hardware
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mahjongg
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Re: I released my ZX81+35 ZX-81 clone design files on Github

Post by mahjongg » Fri Sep 06, 2019 12:07 am

I have drawn the keyboard schematic for my ZX81+35:

Image

I also did the placement, and checked it against my keyboard overlay:

details on my revspace pages.

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mahjongg
Posts: 148
Joined: Tue Nov 24, 2015 10:25 pm

Re: I released my ZX81+35 ZX-81 clone design files on Github

Post by mahjongg » Wed Sep 11, 2019 11:11 pm

And this is how the PCB looks, the component side

Image

and the solder side

Image

the PCB works with a real ZX-81, or my clone, and its dimensions are such that it will fit in the keyboard recess (if you round of the PCB corners somewhat) of a real ZX-81, as it is 6.2 inch wide, and 2,5 inch deep.

you can solder 5-wire and an 8-wire flat-flex cables to the PCB, and stick those trough the opening in the case and connect the flat-flex to the ZX-81 as you would with the normal foil keyboard.

The keyboard uses forty 6 x 6 mm buttons ( MCDTS6-2N or equivalent ) keys with a 6.5 mm x 4.5mm pad pitch, these are industry standard keys and about the most cost effective keys you can buy.

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