I was thinking about NEC V20's 8080 native instruction mode and if there could be possibility to run something like CP/M(-80) on a XT-class machine with V20 CPU and some BIOS modifications. I started to do a research what should I do to achieve this and I found some information, that such OS already existed (I hope, it still exists somewhere) and it is kinda obscure CP/M clone, that was capable to run on V20 equipped XT-class machine without any BIOS or hardware modifications. It is called RP/M2 and it was made by a company called Micro Methods.I found only one article about it: page 96 of this pdf; two ads: on page 84 of the same pdf and on page 101 of this pdf. I also found one message from a person, that claims he possesses the original RP/M2 disks and the user manual. Unfortunately, this person never responded to the questions and the request to preserve and share the original RP/M2 floppy images.

The text of the RP/M2 advertisement from the archived magazines:

RP/M2™ creates CP/M©2.2 compatible IBM PC […]
Show full quote

RP/M2™ creates

CP/M©2.2 compatible
IBM PC

1. Remove the 8088
2. Install the NEC μPD70108 (V20)
3. Boot PC RP/M2
The μPD70108 chip is a fast 8088 that also executes 8080
machine code. PC RP/M2 is an operating system. Either
standalone or with MSDOS present, PC RP/M2 provides the
solid base of a genuine operating system reliably distinct
from the facade created by an MSDOS interface. All 2.2
features are supported with 56.Sk TPA, plus file date and
time stamping, fast virtual disk, iobyte redirection, terminal
cursor positioning, color console display. DOSDISK acces-
ses MS DOS drives; MODEMPC transfers files via serial port;
SETDISK redefines a drive to any of over 80 formats, allow-
ing PC RP/M2 to directly process existing CP/M files in their
native form. Two system disks plus 105 page user and techni-
cal manual $129.Shipping $5 ($10 nonUS)

. 118 SW First St. - Box G
Micro Warrenton, OR 97146
Methods, Inc. (503)861-1765

Pretty interesting offer for a package, that includes a CP/M-type OS and a V20 CPU.

Is there anyone here who has ever seen or used the RP/M2 OS on a XT-machine with a V20 CPU? Or perhaps someone still has the original RP/M2 floppy disks.

I know, that there are programs like V2080-3 CPeMulator, Z80 CPeMulator and V20BOOT, but those are rather a DOS emulators/wrappers for CP/M software.