Watching a Z80 from an RP2350

I’m messing around with the Raspberry Pi Pico RP2350 and PIO and at some point want to see if I can hook it 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.

I’m using a Pimoroni PGA2350 in my own custom breakout PCB.

The Z80 Bus

There is a lot of detail out there about the Z80 and Z80 bus, so I’m not going to go over that again here, but here are some key references:

The key features relevant to me are:

16-bit address bus (A0-A15).

8-bit data bus (D0-D7).

A number of OUTPUT control lines.

A number of INPUT control lines (including RESET and CLOCK).