Sinclair ZX80 / ZX81 / Z88 Forums

Thanks! That's a great tool. I can do some shopping tonight.

Yes - you can use Eagle or similar. If you have 2 layers they are automatically plated through. There is no special fee for that, it's standard. As well as silk print. ;) Cool - that's great! I've got two projects to send to them. :) The least messy and easiest to use etching system that I know of ...

"This item is protected by copyright and/or related rights. However, for this item, either no rightsholder(s) have been identified or one or more rightsholder(s) have been identified but none have been located. You are free to use this item in any way that is permitted by the copyright and related ...

Hi Mark, Thanks for the explanation! I knew that without load the voltage from the supply would be higher (but not by how much, exactly). What I didn't know (I was once a programmer not an engineer ;) ) was about calculating AC RMS peak and the multiplier. I love learning new stuff on here. :D So fo...

I was using one of my ZX81 adapters last night and when I went to unplug it it seemed much warmer than I remembered them getting. It's an original Sinclair one - 9.75V 600MA. When I metered it no load, it measured just over 14.5v. I got out two other adapters (one Sinclair and one DVE) and they both...

I totally agree with everything in this thread regarding the mythical notion of "abandonware" even with differences between US and UK law, but I thought it might be helpful to share a little bit of language we use in trying to clarify this "edge case" where copyright holders can't be located at leas...

PokeMon wrote: ↑Thu May 11, 2017 1:31 pm I guess the guy proposed to buy this item and make the scan yourself after.

Yes, I should try this approach more often!

I am not sure if it's really worth making prototype boards yourself in these days. Now most suppliers have special offers with 10 boards 100x100 mm size for just 5 US$ plus shipment. ;) https://www.seeedstudio.com/fusion_pcb.html What a great resource. I was just hunting for a shop that would do sm...

Or just break the old modulator circuit board by the careful application of extreme force :lol: Mark :lol: I think that was what I was trying to do. I guess I need to go the gym or something. :D Seriously, I was trying to do that but the zeddy pcb was starting to flex. It's hard to believe that the...

I realized the listing expired when the machine sold - here is the image from the listing. I think it might be the folded schematic that was available from Sinclair? I've never seen one of those but I know they were available?? Hi everyone, I saw this listing on ebay for a ZX80 and don't recognize t...