Search found 26 matches

by rcade
Wed Feb 15, 2017 1:58 am
Forum: Development
Topic: ZXblast - ZX81 memory extension plus USB
Replies: 215
Views: 89959

Re: ZXblast - ZX81 memory extension plus USB

I solved it. Adding a 10uf electolytic capacitor between 5v and ground on my transistor video amp solved it completely. Output is crystal clear! Enjoying the ZXBlast- great project. :) It would be nice to have a file manager, though. I did figure out how to load at least one two-part game. HRCHESS 1...
by rcade
Tue Feb 14, 2017 7:27 pm
Forum: Development
Topic: ZXblast - ZX81 memory extension plus USB
Replies: 215
Views: 89959

Re: ZXblast - ZX81 memory extension plus USB

Thanks, I tried 4 different 9V adapters, same thing. USB stick in or out doesn't affect it. Yes, I bought kit and built it. I'm sure it's something funny with my composite mod or something. I will try some ferrite cores tonight and hopefully that will clear it up. Otherwise, maybe some cap(s) to fil...
by rcade
Tue Feb 14, 2017 4:19 pm
Forum: Development
Topic: ZXblast - ZX81 memory extension plus USB
Replies: 215
Views: 89959

Re: ZXblast - ZX81 memory extension plus USB

It's on every screen as long as ZXblast is plugged in... title, menu, and instances. I have two CRT displays- a Sony PVM and a 20" television. It's better on the television than the Sony, but still wavy. I'm going to see if I can find a ferrite bead and put it on the video out wire and see if it hel...
by rcade
Tue Feb 14, 2017 2:59 am
Forum: Development
Topic: ZXblast - ZX81 memory extension plus USB
Replies: 215
Views: 89959

Re: ZXblast - ZX81 memory extension plus USB

I got my kit today and built it up. It works great functionally, but it causes bad interference in my monitor (squiggly lines). I have a 210e ULA and a simple transistor mod. The video is clean with nothing plugged in, and also the Timex 16k packs. It only seems to get interference from ZXBlast. Is ...
by rcade
Sat Feb 11, 2017 3:01 am
Forum: Hardware
Topic: Timex Sinclair 1000 bad Ferranti chip. :(
Replies: 4
Views: 1947

Re: Timex Sinclair 1000 bad Ferranti chip. :(

Are you sure it's bad? The old 184 ULA will not display anything on any of my TV's, but the 210 does. They all work on an old TV from the 70's. :)
by rcade
Mon Jan 23, 2017 2:10 am
Forum: Sinclair Misc
Topic: TS 1000 bad ULA?
Replies: 33
Views: 17562

Re: TS 1000 bad ULA?

My TS1000 has this exact problem also. I have swapped power supplies, with no change. If I remove the case, it takes longer but still happens. I will try to replace my 7805 first, but I am afraid to damage the old keyboard cable. Did you resolve your problem? EDIT: My problem was resolved by replaci...