Sinclair ZX80 / ZX81 / Z88 Forums

In my experience (and from what I've read), 2C158E ULA's typically skew the first pixel line of output to the right when warmed up (best seen with a line of inverse characters printed to the top).

He could try this test and if the characters skew then it's almost certainly a late 158E.

B

Thanks, I mention version 6.7 as that's what my EPROM was marked with :) I have a 27C64 on order, but thanks for the offer :) I was just wondering if a 28C64 would work in its place as I see mention of it in early ZXPand development threads, but this may have changed with later board issues and I wa...

Hi, Using my ZXPand yesterday evening, the current consumption shot up to over 2A (I use a voltage/current module in series with my PSU to monitor stuff like this). I immediately powered off, but long story short, the ZXPand now refuses to work (verified on another Zeddy to be sure it's not the syst...

Agreed - Mark is your man for this kind of work

B

And a very Merry Christmas to you too, Paul

I'm interested in purchasing a kit. please.

Thanks!
Brendan

No problem gents, here they are http://www.bennyalford.com/zx80labels.zip

B

I had the ZX80 replica case on Shapeways printed a few months back, which now houses my ZX80Core: https://c2.staticflickr.com/6/5643/23696049475_b18c04ec65_c_d.jpg https://c2.staticflickr.com/6/5660/23328151449_e7dd3670d2_c_d.jpg I used the case rivets from SMR to complete the case, and drew some st...

Your friend was correct - on the 128K models the audio is modulated onto the composite signal before feeding to the RF modulator (this wasn't the case on the 48K models). So you should have audio over RF, if you don't then L5 may be out of adjustment, or someone may have removed C31 to remove the mo...

Can't believe I missed this

Could you please put me down for 1 PCB from the next batch, whenever that is produced.

Thanks,
B

Moggy wrote:Great work sir another one to add to the collection only another 450,000 to go!!

For the love of God don't tell the wife that

Thanks again!

B