I own a Electronica-bk-0100-01. I have only got around to connecting it up. Before that I opened up the system, checked for bad tracks, obvious issue etc. I also checked the end to end of the ribbon type cable connecting the KB to the mother board.

(this is a non membrane keyboard), so it has been switch cleaned etc.

When I power up the system I get 2 beeps and the standard basic prompt/screen but also a "Z" character on screen. I cant get any keys to go into the basic interpreter - also there is no @beep@ on a key depression.

I dont have an english language manual nor have I yet found a circuit diagram.

Does anybody have experience of this issue - or can you comment. I though the "Z" key might be stuck down, Mechanically it is not, but I may have to go meter the switch connector?

Any thoughts/experience?

  • I have a wee museum in Inverness for DEC Digital PDPs - I have a Saratov(sp) front panel that I am bringing back to life with the help if Jorg kit. I have been sourcing Russian transistors to fix it. The Electronika and it are kind of "off the side". Covid has really screwed up my opening plans! Commented May 7, 2020 at 10:28
  • When covid blows over I'll be sure to pay you a visit. Seems interesting. My Gaelic by now is so rusty. But in case you need any help with Russian, I'm also active(ish) on Russian.SE. Commented May 7, 2020 at 11:44

1 Answer 1


It's possible your Z key is stuck (or perhaps there's a short, or the switch is buggered, or something like that). That would explain the two beeps and the fact a Z appears on the screen when you turn it on.

Better measure the keyboard switch to rule out a problem with it, and also the corresponding trace on the board if you can find it.

  • Aidh, switch was eh knackered - shorted. Cant get inside it (easily) can see the innards after the keycap removed - vanes broken but that would not cause a short. Hunted for the wee missing bits - no luck. So I track cut ;-( I now have a working system - but with no "Z" key. Commented Apr 30, 2020 at 21:51
  • @iainmaoileoin You might get some luck asking here: zx-pk.ru/forums/59-bk-0010-0011.html. It's a Russian-speaking forum but I think they will be happy to help an English-speaking guy (the forum UI itself could be easily switched to English with a drop-down at the bottom of the page). Or, if you want me to, I could post there and refer to this SO thread asking for further guidance.
    – DmytroL
    Commented May 6, 2020 at 8:30
  • I will give them a try. Unfortunately I have absolutely no Russian only Gaelic and English. If I knew a wee bit more about the switch innards I may be able to fix without stripping the whole beast down. Commented May 7, 2020 at 10:23

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