Recent content by Deksor

Hello ! Yes I would love to see pics of that thing, especially if you can open it

Not exactly. Basically we used to work with win3x.org's owner (which hosted the site on their server). I used to be a team member at win3x.org myself. However as we coded the site, we noticed that some choices (mostly being backwards compatible with very old browsers like ie5) imposed by the...

Well the story isn't quite finished yet ! Now the problem lies on the saving (and probably loading) of programs. I tried it with the chinese PSU (before the dearth of the regulator), and I couldn't hear anything on my tape player but hum. I hooked the "mic" plug to the TV to hear the signal...

No, that one is still there. The one I removed is the Chinese PSU. I took it off and put back the original PSU (with new diodes) in the case

Alright ! I received the buck converter, I installed it in place of the 7805, added two ceramic caps, and then I took off my mod, took back the old PSU PCB, swapped the diodes (I salvaged them from the chinese PSU :p ) and here's the result ! I don't have the time to fully test it again but...

Ok so I will fix the original PSU soon. I'll then fix the ZX81's regulator hoping the rest hasn't been damaged ...

I don't have an electrician friend but I guess I'll try to fix the old PSU then. The 7805 might have gotten too hot, but it didn't just shut itself down, it failed as now it doesn't work anymore (it was stone cold when I came back)

So I measured and found about 82v AC :( This is obviously bad but what does this imply exactly ?

So today I received and installed the new membrane. The computer works fine and I could play with it a little. ... Or is it ? I kept it turned on for a few hours because I wanted to find a way to save the program I wrote in. However when I came back the computer was off despite the PSU being...

Well I did the opposite before you answered. I took the chinese PSU appart, which is made out of one single PCB, I soldered the wires of the ZX psu to it and I put the PCB in the ZX psu case. I didn't take the effort of attaching it for now, there's nothing metallic in there, the wires are well...

So I tested with a cheap noname 9V PSU ... and it works ! Thanks !! So the PSU is indeed the problem here. I'd like to keep the original look of the PSU though. What would you suggest ? Fix the old PSU (and how ?), or just retrofit the new PSU inside ? The old PSU is very simple and not very...

Thanks for the tips. I'll check that tomorrow :) My CRT TV has no ground though, so that's already checked out. I don't have any bench power supply, but I could perhaps hack something using a random 9V psu I have laying around or take an old USB cable and temporarily solder it where the output...

It is the original power supply. It had some bad capacitors (one of the two caps inside started to leak) so I changed them before I even made this mod.

Hello ! Today I tried to make a composite mod to my father's ZX81 that he bought second hand in the late 80's because I couldn't use it on any of our TVs. The mod is the ZX2020 mod which replaces entirely the RF modulator. The mod works for the most part, but there's a major incovenience and I...

Hello ! I am glad to introduce Ultimate Retro : https://www.ultimateretro.net/ What's UR.net ? It's a project I've been working on for quite a while now (the year in the name is a hint ^^) and many people joined me afterwards which helped me a lot ! It's basically the motherboard section of TH99...