Sinclair ZX80 / ZX81 / Z88 Forums

Thanks to XorA reminding me about the adjustments needed for the later ULA chip, I've now got a functional Zed after much faffing about. Apart from forgetting the last and crucial aspect of the conversion to composite using Pokemon's excellent mini-board, I'm quite pleased with both my soldering and...

Oooh... have I got one of the newer ULAs? I'd forgotten to check, but you're probably right Will attack it with a small screwdriver shortly

I really am being a bit dense today

I've decided to keep Zed1 (as it is now known) as stock and play about with Zed2, which is a bit poorly as I type this. viewtopic.php?f=7&t=1395

Bah humbug! :( I've connected up the CCB to the Zed, using a nice tidy install inside the modulator box, but now all I get is a blank screen on a composite input off my TV. Plugging and unplugging the power causes a brief flicker as whatever signal is lost, but that's it. My install mirrored the one...

That's brilliant information, thanks. I've got the board on the desk in front of me now, about to install your CCB module, and a visual inspection of TR1 shows nothing, but I suspect that's often the case. I'll put the CCB in and check further once it's done. If it resolves the problem, then I shall...

Thanks Moggy, I'll put a watch on that in case the CCB doesn't cure the issue

Thanks for the input guys... it won't hurt to try a RAM pack on - I have three plus a ZXp already! :lol: The machine is running via the modulator on a CRT TV at the moment... a great big one that takes up most of the desk! :geek: It doesn't do anything on the flat panel I have nearby, but that's a m...

My replacement Zed arrived late last week, and straight out of the box I can see there's a bit of a problem with the TV picture, as you can see in the pic below: http://www.britmodeller.com/reviews/staff/mike/retro/zedex/zed2-screen1.jpg The further right on the screen you get, the worse the picture...

It all revolves around what I find when I undo the case of the new one - If it's tidy ROM and traces, it'll be all systems go.

As it happens, I've got another Zed on the way, as I was missing mine As long as this new one isn't a rarity, too, I'll probably apply any mods to it instead of my Issue 1.