Search found 398 matches

by bola_dor
Wed Mar 08, 2023 4:13 am
Forum: Hardware
Topic: ZX +128 12v rail issues
Replies: 13
Views: 2834

ZX +128 12v rail issues

Hi, I'm refurbishing a Toastrack for a friend, blue yellow ghosting fix sound leveling etc. I found two wide horizontal dark bands in the display , 20230306_005559.jpg I though it could be 100Hz ripple and I found a 2v ripple at the "9v" input, using an original PSU giving 11.7v with machine on. It ...
by bola_dor
Sat Dec 17, 2022 6:43 pm
Forum: Hardware
Topic: ZX Spectrum +2 Grey video artifacts
Replies: 17
Views: 11121

Re: ZX Spectrum +2 Grey video artifacts

Hi folks, i know its been 5 yrs, but i would like to mention that I have also french version if 128+2 gray and i have exactly same problem with video artifacts. I am too using same original cable which was included with new computer. (there are not any diods nor resistors inside the cable....actual...
by bola_dor
Wed Nov 23, 2022 9:32 pm
Forum: Emulators
Topic: Eighty-one used ram?
Replies: 4
Views: 1243

Re: Eighty-one used ram?

Paul wrote: Wed Nov 23, 2022 9:27 pm In EO the live memory view might help.
You can configure to see touched bytes, read, write and enlarge the quality by selection of a specific block.
I use v1.29
I've upgraded to 1.29 too..
I'm trying to fit some Basic program to run on 2k and may be 1K... I plan to use all the known tricks about.
by bola_dor
Wed Nov 23, 2022 9:28 pm
Forum: Emulators
Topic: Eighty-one used ram?
Replies: 4
Views: 1243

Re: Eighty-one used ram?

mrtinb wrote: Wed Nov 23, 2022 8:49 pm I think VB81 gives you better options here. You can browse memory, and by that see how the system variables are set.
I'll see to that...
Then Ibasume Eighty-one can't do that..
Perhaps they can take this as a efeature request

Thanks!!!
by bola_dor
Wed Nov 23, 2022 7:54 pm
Forum: Emulators
Topic: Eighty-one used ram?
Replies: 4
Views: 1243

Eighty-one used ram?

Hi, is there a way to see used RAM wit EO?
That being used by the listing, variables or Displayfile?
I see a lot of data I can't use at the debugging window but couldn't find RAM usage anywhere.
by bola_dor
Fri Sep 02, 2022 6:06 pm
Forum: Hardware
Topic: Brazilian Microdigital 64K RAM Pack
Replies: 6
Views: 1042

Re: Brazilian Microdigital 64K RAM Pack

This person from Brazil is doing that job. I hope he succeeds with it !!!!!
The retro community never ceases to amaze me !!!!!
https://youtu.be/O7537rqQgIk
by bola_dor
Thu Sep 01, 2022 11:30 pm
Forum: Hardware
Topic: No video out on Timex Sinclair 1000
Replies: 16
Views: 2147

Re: No video out on Timex Sinclair 1000

Now you can set the scope properly re test ULA pin 16.. you should see a video signal at 15khz no matter if Z80 is good or not. it only depends on the resonator signal to make a completely white screen.
by bola_dor
Thu Sep 01, 2022 9:18 pm
Forum: Hardware
Topic: Brazilian Microdigital 64K RAM Pack
Replies: 6
Views: 1042

Re: Brazilian Microdigital 64K RAM Pack

Hi Mark, That's what I thought..
I'll search for your post.

A guy at the brasillian TK group showed up wit an identical board but labeled 48k. Too many hypothesis but is it possible to read a PAL somehow?
Thanks
by bola_dor
Thu Sep 01, 2022 3:24 pm
Forum: Hardware
Topic: Timex 2068 Common Faulty Components Question
Replies: 9
Views: 2751

Re: Timex 2068 Common Faulty Components Question

I don't have it at hand right now but you can search for the service manual online. Follow the power supply troubleshooting.. I remember there is a "transistor " Q1 acting as a regulator that should have 5v at its collector. Voltages are managed completely differently than in ZX spectrum or other cl...
by bola_dor
Thu Sep 01, 2022 1:54 pm
Forum: Hardware
Topic: No video out on Timex Sinclair 1000
Replies: 16
Views: 2147

Re: No video out on Timex Sinclair 1000

I am afraid you have a faulty ULA, at least partially as it seems to drive the CLK OK. best way to confirm that is trying a known good ULA. Luckily yours is on a socket.
Your machine is configurated to 60Hz TV.