Sinclair ZX80 / ZX81 / Z88 Forums

With no pension, I'm afraid to leave my full time job, but thankful to have one. Thanks America. lol.
We have 4 cats, so moggy cat better shoot fast

Mark,

Thanks for the hope... Given the voltage issues, maybe issue is upstream of the ram?

Pin 1: .21-.22 on all the ram
Pin 8: 8.30 on all the ram
Pin 9: +5.16 on all the ram
Pin 1 (red, Pin 16 (black): .22V on all the ram

Here you can see how I modified video output of mine with the Mark's buffer mod. You can check ULA video output from the pictures. https://www.sinclairzxworld.com/viewtopic.php?f=7&t=3771&p=38736&hilit=1500+composite#p38736 Thanks... That newer board is much more compact for sure... So, if I got th...

Amazing how that crap little computer box launched thousands of IT workers... Did for me and a friend too - still in it 40 years later.

Brr! I've had the same thing happen to my furnace in the winter before.

I'm in the USA, so the TS1500 is a 60hz one.

All, thanks for the guidance.. I'll need to figure out which pin off the ULA is video then start checking the output at the ula and memory chips voltages next.

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).