Sinclair ZX80 / ZX81 / Z88 Forums

whatever happened with this? Hopefully you didn't sell it and I was the buyer, because I have a TS1500 now with no video lol. My board is identical except no jumper on the back. I did find a factory defect - cold solder joint on 1one of the 2 resistors that are cludged together on the topside near t...

Thanks Mark. I only have a multi-meter, but maybe could get other equipment. is something like one of these a worthwhile investment? I don't do that much with electronics, so not sure all the uses of a scope but don't mind getting one if a workable one isn't too expensive. https://www.amazon.com/STA...

Funny, except for the Roland, exactly the same for me though I got a TS2068 new and still have it. Me and a buddy still program (asm) a bit for the TS1000, and have both started collecting some of the models.. Since we never had the speccy here, I just got my first one 40 years later lol. We both ha...

Hi I don't have a tv with an antenna, so didn't test it first (doh!)Maybe I'll need to undo and find a tv to baseline on. by "no video", I mean nothing at all - no signal whatsoever shows up on the tv. no noise, no nothing and no change when I plug and unplug the cable The little video board is sitt...

Cute. Ghosts are a little fast but it looks good and "feels" right!

Me and a buddy are working on our version of Donkey Kong ("Zonkey Kong") We know its been done much better already, but we started it 40 years ago and by gum it will be done this year lol... (Just polishing up the last bits now).

Is there an overall troubleshooting list or anything that would apply to the 1500? I bought one off ebay, thinking it worked, but no idea really (it was in great cosmetic condition). There's only two socketed chips and they are firmly in there. The ULA is the later model square one. I did the compos...

There's also this one which seems a bit fancier and is more expensive, but I don't know the technical differences. I ordered one but not got it working yet.

https://www.sellmyretro.com/offer/detai ... it%29-2338

Funny, I was looking at just those things on amazon and will no doubt pick one up. I just got my Composite mod board from the UK, time to put it in the 1500 along with a DC/DC power to replace the 7805 and give it a go, and then do the speccy (not arrived yet, along with a QL lol)

I should have thought of a key press... I dynamically define the key functions at startup anyway. I'll file that one away for future use too.

Stefano, thanks, great point! When we are done with it, we'll run it on our real TS1000/TS1500's but sure is a lot easier to develop on modern computer. Even with that constraint we got it working ok now, and can only be more random on the real thing. On to code optimization and arrays....

Thanks!