Search found 28 matches

by Spinnetti
Sat Jan 23, 2021 11:59 pm
Forum: Hardware
Topic: Photos of my TS1500
Replies: 3
Views: 726

Re: Photos of my TS1500

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...
by Spinnetti
Sat Jan 23, 2021 9:23 pm
Forum: Hardware
Topic: TS1500 no video
Replies: 5
Views: 98

Re: TS1500 no video

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...
by Spinnetti
Sat Jan 23, 2021 3:54 pm
Forum: Welcome Area
Topic: Hello from mid-Pacific
Replies: 4
Views: 438

Re: Hello from mid-Pacific

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...
by Spinnetti
Sat Jan 23, 2021 3:47 pm
Forum: Hardware
Topic: TS1500 no video
Replies: 5
Views: 98

Re: TS1500 no video

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...
by Spinnetti
Sat Jan 23, 2021 3:41 pm
Forum: Development
Topic: 2PAXMAN, a new pacman for the ZX81
Replies: 7
Views: 90

Re: 2PAXMAN, a new pacman for the ZX81

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).
by Spinnetti
Sat Jan 23, 2021 5:29 am
Forum: Hardware
Topic: TS1500 no video
Replies: 5
Views: 98

TS1500 no video

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...
by Spinnetti
Sat Jan 23, 2021 4:21 am
Forum: Hardware
Topic: should I do the composite mod?
Replies: 6
Views: 199

Re: should I do the composite mod?

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
by Spinnetti
Thu Jan 21, 2021 3:57 am
Forum: ZX Spectrum Lounge
Topic: New (to me Speccy)
Replies: 4
Views: 516

Re: New (to me Speccy)

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)
by Spinnetti
Thu Jan 21, 2021 3:44 am
Forum: Development
Topic: What am I missing? - Calling RND from assembly.
Replies: 15
Views: 7076

Re: What am I missing? - Calling RND from assembly.

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.
by Spinnetti
Tue Jan 19, 2021 9:25 pm
Forum: Development
Topic: What am I missing? - Calling RND from assembly.
Replies: 15
Views: 7076

Re: What am I missing? - Calling RND from assembly.

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!