Q: How can I read this CP/M diskette?
From Hardware
Unless it is a CP/M formatted RX50 diskette, you simply can't. No utility exists to make it possible.
You can, however, convert it to RX50 CP/M standard on your IBM compatible using a wonderful program called 22DISK from Sydex. The program can read and write most CP/M formats.
If you are attempting to read an RX50 CP/M disk on your Rainbow, you should use RDCPM, a program shipped with most versions of MS-DOS for the Rainbow. The format is:
RDCPM [OPTION] [DRIVE] [FILE]
OPTION is either DIR, READ, or WRITE. DRIVE is the disk drive containing the CP/M diskette (this can also be a CP/M hard disk partition). FILE is the file to perform the operation on, whether it be for DIR (ex. *.DAT), READ, or WRITE.