I haven't, but the problem described of the ISA BUS speed being too high is real. I guess it would be better to tweak this design and just feed the correct clock to the AY chips via a separate oscillator. I'm assuming it is a TTL clock signal.

I would imagine root42 would have done it by now, or maybe it's in his plans to do so.

That is one very, very basic board 😉

It's just begging for either a standalone oscillator or a configurable divider to allow it to run safely at 8MHz ISA bus.

According to the Hackaday writeup: " adding support for it in software and emulators is trivial". I've seen PicoMEM can emulate it, but Given Bank Street Music Writer isn't exactly on everybody's must-have list, anybody seen any software that has been modified to use it yet?

Only thing I don’t like is the chips standard I/O port is at port 300 and 302 (second AY chip). Port 300 is a common choice for hosting a second MPU-401 interface.

However patching software seems trivial indeed so port 302 (first) and 304 (second) would be a safe choice.

Also this board is an excellent candidate for a AIL 2 driver, with 6 voices it will sound much more complete than Tandy can do with only 3. Just cut out rhythm channel notes cause those won’t translate well into psg chips, and will for certain make the tunes sound well…out of tune.