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Hello,
I've successfully installed the Kaypro II in Mame. I can boot CP/M 2.2
successfully (cpmboot). I'm having problems with the non-alphanumeric
keys (; : ' " [ { - _). The correct key emulation produces a click and the
appropriate character. The unsuccessful key emulation produces a click
and a beep and no character. All the listed keys produce the click and beep.
All the contents of the Input submenu that list the mappings seem to be OK.
Do I need to specify the keyboard provider, ie win32? Or, is this a bad
keyboard emulator?

I just booted CP/M on the kayproii system in MAME and I can type all those characters at the CP/M command prompt just fine. It’s worked fine ever since I added low-level emulation of the keyboard. That’s with the usual RawInput keyboard provider on Windows.

The cpmboot disk image performs some weird remapping of the ASCII codes sent by the keyboard. Y and Z are interchanged (this is probably a German version of the OS), @, ^, * and ( become ", &, ( and ) (as on a bit-shift keyboard), & becomes /, < and > become ;, / and ? become _ and -, ] and } become + and *, # isn't recognized, etc. Clearly it expects some different keyboard model.

I performed some further experiments with the MAME source. I hooked up my new keytronic_l2207 emulation, and it surprisingly proved to be almost entirely compatible with normal Kaypro versions of CP/M; even the non-ASCII codes for the numeric keypad are OK. (The Set-Up and PF keys do nothing useful, but that's not terribly surprising.) Even more intriguingly, the primary dump exactly matches that of an INS8048 somebody dumped from a Kaypro II.

I tried rawinput but there was no change.

I have seen the interchanges. I was looking for a colon so I could switch to drive B:
The > key produces a colon.
I'll leave a permanent solution to someone with more experience. Thanks.

There are probably multiple undumped Kaypro keyboards. We’re missing a dump for the 8751-based Kaypro II keyboard. The one we’ve got emulated now is from a Kaypro 10 after they switched to mask programmed 8048 to reduce costs.