digger wrote on 2025-07-03, 22:59:

For conventional memory, I'd reckon those waitstates might have quite some performance impact.

For EMS it might not matter as much.

It would be good to get some benchmark results to find out.

Exactly.. this is precisely what I was thinking. Tbh, I have 192kb UMB and 640kb base RAM already, I'm most interested in the EMS feature. 4mb EMS board would be the ducks nuts for me, but I'm less keen if it's going to run slowly like PS-RAM at 900kb/sec on the 2350 ..but I believe the PicoMEM is 2040 based.

I'm half tempted to write a utility to see what can be read/read per second but would prefer if there's an existing standard solution.