Good news, the high pitched beeps in Tasc R30 and RISC 2500/Mephisto Montreux is fixed.

I also found another issue I'd like to mention:
King 2.50(R30 version) is protected against RAM upgrades. If you install more than 512KB RAM, it will still detect the RAM expansion. But it limits RAM usage to only 128KB. So, if a person wanted to make their R30 stronger by installing more RAM, King 2.50 will actually become weaker.

King 2.2x will happily eat all hash RAM expansion you give it though.

And it appears Gideon never uses the hash RAM above 128KB. I can only speculate, maybe the prototypes of Tasc R30 only had 128KB RAM.