Sinclair ZX80 / ZX81 / Z88 Forums

Thank you both. Good advice. OK I may give it a go...also yes I have seen the Pi emulators and I think one that simply runs on the system without Linux (although perhaps that was a spectrum). Thanks A Pi Pico emulator for the ZX81(which runs without an O/S) is picozx81. https://github.com/ikjordan/...

Donated - 5BP44043KX007493U
Many thanks for the forum

There is a new release. https://github.com/ikjordan/picozx81/releases This supports 3 new board types (that makes 9 commercial board types in total): Waveshare RP2040-PiZero (An inexpensive HDMI board, with sound over HDMI) PICOZX with mechanical keyboard by Bobricius (VGA and runtime selectable VGA...

For some time, the ebay seller zzapmort has been selling hardware with built in mechanical keyboards that uses the Raspberry Pi Pico to run a Spectrum emulator. I recently bought one of these and ported the ZX80 / ZX81 pico emulator ( https://github.com/ikjordan/picozx81 ) to it. There is now a list...

These links may help:

Book
http://www.nonowt.com/magfold/mmcode/mmcdindex.html

Downloads
http://www.nonowt.com/magfold/mmcode/download.html (disassembler at bottom of page)

There is a new release for picozx81 at: https://github.com/ikjordan/picozx81/releases/tag/v1.0.4 This release adds the following, compared to the last release made in November: + Colour display emulating Chroma 81 and Chroma 80 for all board types, including HDMI + General support for ILI9341 and ST...

Thank you for the feedback, I appreciate it :-) Sometimes there are options within the TV set-up that can help with re detection of HDMI devices.It may be related to how the TV does hot plug detection through HDMI pin 19. There are some sites that describe workaround for this by blocking connection ...

Yes, the photo shows the two pads that need to be joined.

Either of the Olimex uf2 files will work. picozx81_olimexpc.uf2 will provide sound over the 3.5mm audio connection picozx81_olimexpc_hdmi_sound.uf2 will provide sound over the hdmi cable There was an issue with the original Olimex firmware, where stereo audio over the 3.5mm audio connection was not ...

Thanks for trying picozx81 :-) Some makes of TV detect an HDMI device by looking for 5V on pin 18 of the HDMI connector. Unfortunately, by default, the Olimex board does not supply 5V to that pin. However, there are two pads on the back of the board, which when shorted with a blob of solder, will en...