Confirmed that my copy works the same on the 100A as the 100B and the picture matches what I posted for the 100B. Looks like escape sequences are getting lost in the 100A one in MAME for some reason. I have screen shots of the physical rainbows, but I didn't include them because they didn't add any info and I thought it might be seen as bragging (plus my machine room is a mess).

Also, my 100A identifies itself as having version 01.01.11A firmware rather than the 04.03.11A firmware that's in the archive. I've not snagged the ROMs to see what the difference might be.
[Linked Image from people.freebsd.org]

I've uploaded the CP/M 1.0 disk image in physical sector order. The label says:

CP/M-86/80 V1.0 BIN RX50
Serial No. PC100-528-38978
Part # BL-N648A-BV

I've never got the hang of converting the images I have to TD0 or ImageDisk format. frown. Since only the Lotus 123 disks have the copy protection stuff on it, it hasn't been much of an issue...

Last edited by bsdimp; 01/01/21 06:15 PM.