Search found 2160 matches

by Lardo Boffin
Fri Jul 02, 2021 9:32 pm
Forum: Hardware
Topic: How to troubleshoot a Sinclair ZX16K RAM Issue 3
Replies: 24
Views: 5783

Re: How to troubleshoot a Sinclair ZX16K RAM Issue 3

Not wishing to reignite the whole heat sink thing! Just curious what temperature they actually run at.
by Lardo Boffin
Fri Jul 02, 2021 7:24 pm
Forum: Hardware
Topic: How to troubleshoot a Sinclair ZX16K RAM Issue 3
Replies: 24
Views: 5783

Re: How to troubleshoot a Sinclair ZX16K RAM Issue 3

A thermal camera? It would be interesting to see what temp a standard zeddy ULA gets to after being inside a case for a hour (switched on and running! :lol: )
by Lardo Boffin
Fri Jul 02, 2021 3:47 pm
Forum: Hardware
Topic: K - then black screen
Replies: 6
Views: 1633

Re: K - then black screen

citizenfish wrote: Fri Jul 02, 2021 12:50 pm Turned out this was a faulty composite mod. The board had been previously modded and looked a bit of a bodge. I replaced with a Rude dog Retros unit and now have a lovely clear K.

This ZX81 fixing is addictive. One more to go
:D
by Lardo Boffin
Thu Jun 17, 2021 8:47 am
Forum: Welcome Area
Topic: Greetings from London
Replies: 2
Views: 1214

Re: Greetings from London

Welcome. Its only a small step from emulators to a room full of zeddies!
by Lardo Boffin
Fri Jun 11, 2021 5:19 pm
Forum: SALES
Topic: Sold - Issue one PCB working but with large heat sink on ULA
Replies: 6
Views: 3659

Re: For sale - Issue one PCB working but with large heat sink on ULA

Moggy wrote: Fri Jun 11, 2021 5:15 pm Quote.
"The ULA has a large heat sink attached which I doubt can be removed....!


Really?
Awesome! Can I borrow it please?
by Lardo Boffin
Fri Jun 11, 2021 4:15 pm
Forum: SALES
Topic: Sold - Issue one PCB working but with large heat sink on ULA
Replies: 6
Views: 3659

Sold - Issue one PCB working but with large heat sink on ULA

Hello all I have for sale a working issue one zeddy motherboard only, but the catch is that the ULA has a large heat sink attached which I doubt can be removed and won’t go in a standard case. I know some of us have zeddies in larger enclosures so it may be of use? It is working as shown - I have lo...
by Lardo Boffin
Wed Jun 09, 2021 1:02 pm
Forum: Welcome Area
Topic: Hello from the Netherlands..
Replies: 8
Views: 3173

Re: Hello from the Netherlands..

redhawk668 wrote: Tue Jun 08, 2021 11:01 pm
For the ZX Spectrum 16/48K I designed an s-video board to replace the modulator, to provide dotcrawl free video output.
Welcome on board. :D

The dot crawl free board sounds interesting.
by Lardo Boffin
Sun Jun 06, 2021 12:25 am
Forum: Hardware
Topic: ‘Tatung 81’ (ZX81 in a case)
Replies: 29
Views: 7803

Re: ‘Tatung 81’ (ZX81 in a case)

Thanks Mark. I transplanted my rebuilt zeddy inside and it works a treat. :D (still need to finish the switch on the ROM) Then I decided to put my ‘Spand inside. Nope…. 2D7FF549-AB06-4F0A-AA2D-339AEC1135DE.jpeg Going to hit the PSU. OK. Put back the IO expander and then mount it on that. FBC39433-72...
by Lardo Boffin
Sat Jun 05, 2021 11:43 am
Forum: Hardware
Topic: 16K RAM Pack photos - please add yours
Replies: 23
Views: 10770

Re: JRS 16K RAM Pack

This is about the sixth design of ZX81 RAM pack that I have seen. Each one uses a different method or different variation of design for obtaining a -5V supply. Some use a transistor oscillator driving an inductor like the Sinclair 16k RAM pack. Some use a CMOS logic chip and capacitors to do it. So...