My Zeddies…

[1024MAK]

While Lardo continues to trade over on Lardo buys another zeddy, I continue to rediscover (from storage) machines that I have previously obtained.

Although, I can’t always remember the history of them…

Like this one:

ZX81 bought in November 2017

I obtained this one in November 2017. For some reason, the heatsink is no longer attached, and it looks like I renewed both electrolytic capacitors. The keyboard membrane is broken (as expected).

I will have to investigate further when I have time…

But meanwhile, it’s interesting because all chips are directly soldered.

Model: ZX81, U.K. version.
Serial number: none
PCB: Issue one, green solder resist on bottom only.
Modulator type: UM1233 (UHF channel 36), date code: 8226
IC1 - ULA - 2C184E, date code 8233
IC2 - ROM - Motorola ZCM3881C, date code 8237, ceramic case,
IC3 - MPU - SGS Z8400AB1, date code 8208
IC4 - RAM - MOSTEK MKX4118P-4, date code 8040, with gold top ceramic case!
Notes: apart from the two electrolytic capacitors having been renewed, no sign of any other rework on the board.

Mark

[Lardo Boffin]

I have a vague memory of selling you a zeddy with a goldy-looking RAM chip a while back as I didn’t want to refurbish it as it was so cool looking but my ‘buys another zeddy’ only goes back to 2019.