Hi
Sorry for replying to this several weeks later, I only check this group
sporadically and now it is a long time ago.
Actually this item say model: cp/m so not for TRSDOS... it is a pretty
unreadable small image that says cp/m so easily missed.
It also has -sys so Ira's disk probably boots into whatever CP/M it wants to be
for. Maybe CP/M PLUS from Tandy/Digital Research for M4 is a good guess.
Searching I found this
http://www.z80.eu/downloads/Aztec-C106d.zip
in this site
http://www.z80.eu/c-compiler.html
unfortunately the files are no longer on a virtual TRS-80 floppy.
A K&R type C it seems, not ansi. And I found some assembly that looks like 8080
mnemonics. Maybe the compiler is 8080 code which runs fine on Z80, generating
8080 code also. Possibly CP/M PLUS is 8080 code too but for M4 hardware.
BTW I have a Kontiki computer (later renamed to Tiki) which runs KP/M, which is
a total rewrite of CP/M for Z80, lightning fast compared to CP/M... :-)
Knut