Sinclair ZX80 / ZX81 / Z88 Forums

As for the voltages readings off the TS1500; +5V on a C11 + side = 5.06V; -5V between D9 & R23 = -5.17V; +12 (to be determined of its test point) = 12.36V.

I will post a few pictures of o' scope's screens here little later tonight.

Dessony

Hi somebody, I created a little cute Veroboard/stripboard project drawing based on 1024MAK's excellent ZX81 Video Transistor Buffer Amplifier circuit design. On my drawing, the outside "square" is a metal gutted-out video modulator. And the inside "square" is the Veroboard/stripboard. Cheers :D :lol...

Hi everybody,

We know that a TS1500 customized ULA is a SMD "square" 68. ZX81 ULA and TS1000 ULA are DIP 40.
Enjoy this file! ,
Dessony

Hi ts1000user,

Do you have an oscilloscope? If so, you can check an ULA's back porch "wave" with a probe into a video output jack or on a "middle" wire before a video modulator or on a D9's anode.

10us 2v AC TVH

Hopefully, this will help you out,
Dessony

Hi 1024MAK (Mark), I want to install slightly more modern DRAM chips or SRAM chip which doesn't request -5V and +12V. I'm submitting a few photos here. DSC00247.JPG DSC00248.JPG Notice that I took parts off, which is producing these -5V and +12V, the board. DSC00249.JPG DSC00250.JPG I also will type...

A TS1500 Resurrection. Step by step appreciated. Hi everyone, I have 2 (two) TS1500. One board have had the 8 (eight) 4116 DRAMs desoldered, removed and -5VDC and +12VDC circuit section removed from the board. And another board have these DRAMS and its related circuit section still intact. Both TS15...

Pokémon, I finished reading the recent ZXmore - info & updates posts. Real interesting! However, I have a few questions for you. What is a different between the ZXmore (V1.1) and the ZXmore (V1.2)? Do we need to do any additional works underside the V1.2's board? Can we just transfer these ICs off t...

The German ZX-Team shared these 4 files with us. So I, as an American, decided to Google-translate my message into German on this website!

Ich bin sehr dankbar, dass das deutsche ZX-Team beschlossen hat, diese 4 Dateien auf diese englischsprachige Website hochzuladen!

Danks,

Bill

These first two videos are real cool! However, may we view these last two videos? It asks for a password.

Welcome to this computer forum! I want to make you, as an American, feel comfortable from an American. I am from Indiana, USA.