Search found 60 matches

by msellan
Thu May 11, 2017 11:07 pm
Forum: Hardware
Topic: Create ULA for €5?
Replies: 84
Views: 20779

Re: Create ULA for €5?

Thanks! That's a great tool. I can do some shopping tonight. 8-)
by msellan
Thu May 11, 2017 10:28 pm
Forum: Hardware
Topic: Create ULA for €5?
Replies: 84
Views: 20779

Re: Create ULA for €5?

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 ...
by msellan
Thu May 11, 2017 10:19 pm
Forum: Software
Topic: ZX81 Software releases
Replies: 14
Views: 36498

Re: ZX81 Software releases

"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 ...
by msellan
Thu May 11, 2017 9:31 pm
Forum: Hardware
Topic: Proper voltage for ZX81 AC adapter
Replies: 20
Views: 6520

Re: Proper voltage for ZX81 AC adapter

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...
by msellan
Thu May 11, 2017 5:36 pm
Forum: Hardware
Topic: Proper voltage for ZX81 AC adapter
Replies: 20
Views: 6520

Proper voltage for ZX81 AC adapter

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...
by msellan
Thu May 11, 2017 5:29 pm
Forum: Software
Topic: ZX81 Software releases
Replies: 14
Views: 36498

Re: ZX81 Software releases

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...
by msellan
Thu May 11, 2017 5:16 pm
Forum: WANTED
Topic: Does anyone have this brochure?
Replies: 13
Views: 5782

Re: Does anyone have this brochure?

PokeMon wrote: Thu May 11, 2017 1:31 pm I guess the guy proposed to buy this item and make the scan yourself after. :mrgreen:
:lol: :lol: Yes, I should try this approach more often!
by msellan
Thu May 11, 2017 5:15 pm
Forum: Hardware
Topic: Create ULA for €5?
Replies: 84
Views: 20779

Re: Create ULA for €5?

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...
by msellan
Thu May 11, 2017 5:06 pm
Forum: Hardware
Topic: ZX8-CCB installation help
Replies: 22
Views: 5547

Re: ZX8-CCB installation help

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...
by msellan
Wed May 10, 2017 5:29 pm
Forum: WANTED
Topic: Does anyone have this brochure?
Replies: 13
Views: 5782

Re: Does anyone have this brochure?

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...