My own experiment has recently been a Z80 hooked up to an Arduino - which fakes I/O and RAM accesses to/from the chip.

I got as far as getting BASIC to run, but struggled porting FORTH to z80. Existing Z80 forth interpreters I found need almost 64k but wiring up some static-RAM hasn't yet given me a functional system so I'm hazy on what is wrong; either my real-RAM or the interpreter itself.

My issue when I build my homebrew computer in college was that I didn’t think to put biasing resistors between the z80 and SRAM, since it’s TTL.

You probably didn’t do something that silly though.

That's great! The idea of a cluster with a wireless interconnect is hilarious to me for some reason.