Sinclair ZX80 / ZX81 / Z88 Forums

Yes I agree, my LCD TV is fairly old and most likely won't work with this ZX81 I just did the one NPN transistor a 2222A, with one 100 ohm resistor off the E of the transistor connected to the center of the RCA and then to ground, worked very well on my other two, but not this bone stock one. The UL...

Hi all, I finally got back to working on this problem, and I can not understand why it only showing a white screen with no K prompt. I done the same video mod that I used on my other ZX81, and my TS1000 and they both work on my LCD TV. I got to thinking that the mod is for a composite monitor, I got...

Hello and welcome, I am also a fellow Canadian, from Belleville ON. A great forum for all things Sinclair, really knowledgeable members, they have been a great help to me.

Hello fellow Canuck. I am from Belleville Ontario, this is a great forum to get answers on everything Sinclair.

Hi Daniel,
Thank you for the link and picture. I have them in my cart at Digikey. Take care.
Cheers.

Richard.

Yes these look correct as far as the pin placement, but not sure if dimensions are correct. I sent a messages to the designer asking him/her what and who the makes the PB203G jacks. Thanks.
Cheers.

Richard.

Thanks for the reply. I looked at those ones, but the pins do not match the holes in the PCB. I got the part number off the board schematic, from the ZIP files. I looked at PJ-324 and it seems to have the correct pin placement on them, but can't get here in Canada, or the US. If I knew who's part nu...

Quick question on the ZX81 cassette signal cleaner. I am trying to find the PG203J cable jacks? I live in Canada and can get the pcb build thru Osh Park, and all the componets except for the jacks. Thanks in advance.

Cheers.

Richard.

I finally got a vLA81 ULA for my TS1000 and I installed it. I installed the membrane on the pcb, the installed it in its case. I then hooked up the computer to the monitor and plugged in the power, and up came the K as before. I then tried a couple of keys, but still no response? I was somewhat dism...

Hi Mark,

A13 is pulsing very rapidly, showing L only

ROM pin 20 is pulsing showing H & L The ROM is a Motorola ZCM38818P date 82 40
My old camera is only 5MP but works great for Ebay, I hope the pictures come out OK for you.

Cheers.

Richard.