Sinclair ZX80 / ZX81 / Z88 Forums

WRX hires works out of the box on a 1k ZX81. It’s the 16k RAMpack, that doesn’t support WRX hires. Therefore a simple modification has to be made to the RAMpack to enable WRX hires. You can also build a custom adapter between the ZX81 and RAMpack. Modern RAM-expansions like the ZXpand support WRX ou...

We've all been there.

I was told to use MPS2369 as a replacement, and it works great in my ZX81.

msch wrote: ↑Fri Nov 27, 2020 4:38 pm Hopefully we will see this at the next ZX-Team meeting

Yes, I've got some problems to hack before it becomes a reality. But I'm working on it.

I'll try with the current approach. If I can't get it to work, I'll try with a microcontroller.

Yes I had already found those pages. That's is my reference for my current prototype pcb.

It’s difficult to see if this schematic of the 16k expansion, will also solve the keyboard translation. The chips on the schematic is just labeled Z1 - Z6, so it’s difficult to know what they do. Even if this schematic will solve the keyboard translation, we don’t know that the different terminal mo...

I have admired the French VP100 (ZX81 inside a minitel terminal) for a while, and wanted to recreate one for my own ZX81 use. Minitel bought. Check! Equipment for secure discharge of CRT purchased. Check! Mintel terminal disassembled, minitel pcb and keyboard removed. Check! Keys rearranged on keybo...

A subset of Basic can be translated to Machine Code using MCoder II.

Here is some info about it: I know Pascal. That’s not the issue. The problem is this implementation gives you a 3-letter prompt, Nothing happens no matter what I type. This software seems useless without it’s manual. I’ve looked through the binary both in ascii and zxscii. There’s not recognizable ...