I'm an old time ZX user and have got some ZX81s recently. I've a couple of Issue 1s and 3s. I've been asking questions over on WOS and the guys have been great helping out. But I think ZX81 stuff gets lost amongst the Spectrum related discussion. So I looked for a dedicated ZX81 forum and here I am...
I'll try to keep my questions to one subject at a time. Here is the first.
The TV I'm using can tune into the RF signal but it is rubbish. I got a couple of ZX8 Modules from Pokemon and these are fantastic with the Issue 3/210 ULAs
However, when I try on the Issue 1s (one ULA is marked 8113 and the other is a 184) I cant get the ZX8 module to give a decent cursor. I get a black block 4 or 5 characters wide, its slightly skewed and the screen back ground is poor. I'll try to post a pic or link below...
![Image](http://www.scotek.net/WebPics/ZX2.jpg)
What are your opinions? Is it the motherboard or ULA versions.
I bought a new 210ULA and tried it in one of the Issue 1s, but I cant even get to the cursor on either RF or ZX8. Can ULAs be swapped between different ZX81 issues?
All, for now.
Dave