Sinclair ZX80 / ZX81 / Z88 Forums

Squidgy!

Never mind. I have a roll of sticky back neoprene foam tape that's exactly the right width to cut ZX81 feet from, so mine may end up with squidgies after I've cracked it open.

What do the instructions with the converter say about how it converts SCART to HDMI? If it's just taking the composite video signal and converting that, one of the MINI AV2HDMI branded converters you can buy very cheaply on eBay may be able to do the same thing if you can provide composite video via...

Lardo Boffin wrote: ↑Thu Jun 08, 2023 2:06 pm A few things to look out for in very early zeddies:...

Good stuff! Thank you.

A rough rule of thumb re manuals are if it's a spiral bound version then it belongs with an issue one board. For the later issue three boards they tended to have what I call, the normal paper back book spine, again just a rough and ready rule. Thanks Moggy. I found the thread on ZX81 manuals. I had...

Ah, so you outbid me? Glad it went to a forum member. :D Probably only by a few pence. I'm sneaky like that. ;) The feet don’t look like the soft sponge types so its unlikely to be very early. But it is in lovely condition. Correct. They're hard feet, not squidgy. It's in such amazing condition tho...

A Zeddy and a 16K RAM pack are perfectly fine in terms of power consumption when running from a UK700 PSU. The UK700 is rated at an output current of 700mA and a ZX81 requires between 300mA and 400mA (although most less than 400mA), leaving 300mA at least, available for expansions. Sinclair supplie...

Hmm. The manual is a Second Edition reprint from 1982, although I'm not sure whether it belongs with this ZX81 or was put together with it later. I'm guessing it has something to do with the arrival of the 16K Rampack or the ZX Printer as I wouldn't be happy running either of those from a 700mA powe...

Hi peeps, I'm asking this because I've just bought the best looking ZX81 I've ever seen in an auction and it came with a UK700 PSU, so I'm guessing it's fairly early? This one was mis-listed on eBay so probably didn't attract as many bidders as it could have, so I got it for £31 delivered. :D The ZX...

I've got away with the same CPU in a ZX81 before, so fingers crossed these run properly too. I'm planning on measuring current draw as part of the test, so if they're any more power hungry than the genuine part I already have, that'll be a good indicator of any fakery. No ZX Spectrums here I'm afrai...

Hi guys, I'm taking delivery of 12x used Z84C0006PEC CPUs soon and was wondering what you'd recommend as a minimum test I can carry out to check they're OK? The only testbed I have is a socketed ZX81, and the reason I'm asking is because I may be selling some of these on as "tested & working" as I d...