ikjordan / picozx81 Goto Github PK

Hi,
I bought a Olimex board and flashing went well. I do have the zx81 screen but can’t access the sd-card. I tried different ones, no success. Are there different boards outside?

Since the ZX80 and ZX81 have just black&white video output all the circuitry of VGA (mainly resitors to mix the colors) might be omitted using just one of the analog pins (analog just to generate proper front and back porch). Probably a simpler output in any sense might be the composite one with just two wires.
Also the same for the audio.
See for example the wespi ZX81 addon, just the bare ESP32 and some little components.
Maybe one or two resistors should be attached to the cables, but there should be no need of an external board...
Not sure how to program the 2040 "coprocessor" but should not be difficult for the expert to adapt.
What do you think?
PS: I've found also a working instance to take inspiration from https://areed.me/posts/2021-07-14_implementing_composite_video_output_using_the_pi_picos_pio/

Clicking on the link to download an SD card image the browser returns a 'Not Found' message.
No file is downloaded.
Is there an updated link ?