Watching a Z80 from a Raspberry Pi RP2350

Article excerpt

Kevin was messing around with the Raspberry Pi Pico RP2350 and PIO and at some point wanted to see if it could be hooked up to a Z80. As a starter, I’ve been experimenting with seeing if I can get an RP2350 to see the Z80 address and data bus in any manner. Of particular interest to me is the clock speed. In particular, what is the minimum clock speed possible? I’m using the Arduino Pico core from Earl Philhower which makes it easy to build and download code to the RP2350, but I’m trying to stick to Pico C/C++ SDK functions rather than using the Arduino environment overlays. Naturally this is a pretty crazy thing to be doing, but it is showing the basic idea. See the video below and more in the article here.