Sinclair ZX80 / ZX81 / Z88 Forums

Due to a request on the german board I am actually working on a keyboard pcb with tactile switches for the ZX Spectrum Plus and Spectrum 128k models. This should be available in mid of december I think - just in case there may be interest in these boards here, too. It will cost a bit more than the standard spectrum keyboard as there are more switches and some additional components on the backside (analog switches and some diodes). The difference to the 48K-KDLX would be a few pounds only, I think.

The pcb replaces the plastic or metal plane at the backside of the keyboard (no need together with the stable pcb) depending on the version of the corresponding models.

Hmm, I have some ZX Spectrum+ machines awaiting keyboard repairs. I would be interested in one of these to try

Mark

So the first test of the circuitry looks good - not 100% passed as my magnifying lamp died and need a new luminescent tube.
Hard for me to work without.

I did the calculation of the project and the board is bigger than the 48K-KDLX and has about 50% more tactile switches.

The complete set (construction kit) consists of
2 layer pcb, 256x99 mm (10.0 x 3.9 inches)
58 ALPS tactile switches SKQGFAE010
2 flat cables to connect keyboard to the molex receptacles
5x 74HC4066 analog switches
4x BAT54A duplex diodes
11x BAT54C duplex diodes
1 capacitor 10uF/16V
4 resistor network 5x 100k

The complete set will be offered for GBP 24.00 nominal price on sellmyretro later and all preorders will have a discount of 20% which results in effective price of GBP 19.20. I think this is a fair deal for all supporters of this project. Shipment will be GBP 2.90 for all international orders.

Schematic is attached here as well.
All people interested in preorders may leave an informational post here or give me just a PN. Thanks.
Expected to be available for delivery in mid of december.

Looks good, I have at least one of those machines that needs a new membrane anyway so Ill take one!

OK - thanks.

I am interested in one please.

BTW if you did a QL version I bet you would get interest. The default QL keyboard is truly horrible

Well - I think about changing my name from PokeMon to KeyboardMan.

PokeMon wrote:Well - I think about changing my name from PokeMon to KeyboardMan.

Gotta catch them all!