Sinclair ZX80 / ZX81 / Z88 Forums

Great job, and great reference for future fixes.

I bought a Hantek 2C72 for $130. It has 70 MHz. My first oscilloscope.
https://a.aliexpress.com/_msSyV3l

There is a trick, if you are not a beginner in Z80 assembly. All instructions that start with 0,1,2,3,8,9,A and B will be overridden with a NOP instruction, but all instructions that starts with a 4,5,6,7,C,D,E and F are not modified, so these can be used to programs on any address. Since you'll be ...

Just remember. Saving in EigthyOne is a two step process. Having the file shown in the tape window is not enough. It just means it’s in EightyOne’s memory. You have to save it to a Windows file from here. When you add another file to the tape, it is still in RAM, so you need to save to a new file ag...

You could try to measure the pins of the ICs like described in this thread

Getting your logic probe to work, and compare how the pulsing should be, would be a good start.

Looking forward to a native Mac app. Please make sure it works with Apple Silicon M1.

DrVenkman wrote: ↑Sat Jul 31, 2021 8:41 pm Now can someone point me to a reputable seller where I can buy a TZXduino or even a kit? I would quite enjoy building one.

It seems they come quite cheap preassembled on eBay.

It looks like the game in the video is based on the dk’tronics hardware, which uses UDG (user defined graphics chars). So it is still text mode, but the chars are changed. Other hardware than dk’tronics that support this is UDG4ZXpand or Chroma 81. However with a WRX enabled RAM expansion you can ma...

Or you could just make most of the code in a non-GUI library that is common, and platform specific front end.

Another one being a little pricey at €100, but there’s an option to make an offer.

https://www.ebay.com/itm/234105614165