Sinclair ZX80 / ZX81 / Z88 Forums

Hi, I wanted to say that I built a "printer" for the ZX81 that plugs into the expansion slot. It is built around an ESP32 Arduino-like board that interfaces with the ZX81 through some 74 series logic gates. The microcontroller stores whatever is printed in memory and shows it on a simple web page. I...

Thanks!

Makes total sense! I've never actually written any Z80 assembler so I didn't know about the modes, and was also didn't know which one the XZ81 is using. The "CPU Response" chapter of the z80 manual is after the pin descriptions so I never got that far:)

Staffan

Hi, I'm a beginner ZX81 user (just built a ZX81+38) that started to play around to learn how the hardware is working, and I currently want to understand the details of how the printer works. I've read that the ZX printer is connected only to very few pins of the expansion port: A2 for addressing, D0...

Hi,

Hi -- I built a zx81+38 a few days ago and have been playing around with my new toy for a bit. Hoping to find some help and maybe to build some hardware add-ons as time goes by!

Staffan