Sinclair ZX80 / ZX81 / Z88 Forums

Today I got this beautiful screen, with no reason. I mean I didn’t do anything new. https://i.postimg.cc/5X46zKKb/F2-D60863-01-F8-4-EAE-B2-E8-BD2-E987-CF479.jpg But after I hit something on keyboard, half texts missing: https://i.postimg.cc/H8tTsdg5/86981197-22-ED-4-B05-B21-F-01-F53-ACF8-EFF.jpg Aft...

Here you are:

I will try first JoulesperCoulomp 555 based circuit if you don’t have any objection. Of course I don’t have any problem test MAK1024 solution in the future. My goal is to hide everything inside the modulator case. I will post here the results when I am ready. Thank you for your time. Well, I just d...

I will try first JoulesperCoulomp 555 based circuit if you don’t have any objection. Of course I don’t have any problem test MAK1024 solution in the future. My goal is to hide everything inside the modulator case.

I will post here the results when I am ready.

Thank you for your time.

I tried this simple circuit, to see if I got any better results: https://i.postimg.cc/PPpsz20H/457-C5014-E5-CF-49-D4-9-C64-E580697586-B4.jpg What I get is a way better screen but this mod work only on a crt tv with AV input. On a modern tv I get a white screen with no "K". On the crt also give me a ...

In case that I can’t find a solution, what is the best way for a composite mod? I want to hide it inside the modulator case. Any link please?

Thank you

https://i.postimg.cc/qgs2L11K/2-CF9-BF91-BF1-B-4-E3-F-8-E27-EE9-D7-BCA3-D0-A.jpg https://i.postimg.cc/QHS1LHGx/4453728-D-7545-480-F-A0-D3-8863-DD401-F68.jpg https://i.postimg.cc/9DMTcCCP/C66-FBE8-A-1556-4-F47-8-E10-73893-C73-E706.jpg Following pictures taken with composite technique. That’s mean th...

Hello Mark.

I hope you doing ok. I am back with a Hantek DSO5102P Oscilloscope. I am new with that kind of tool but if that could help to fix this beauty i am all ears to mesure anything you want me to.

Nop my friend. This is only for 4116 dram IC’s. If you want to test 4164 / 41256 please look the description in video cause this project based on 4164 tester. You can find all info you need to build one.

And here is a video.

https://www.youtube.com/watch?v=F2GORWsW5_k