On Thu, Dec 22, 2016 at 7:01 PM, drlegendre . <drlegen...@gmail.com> wrote:
> The Z80 also showed up in the Osborne, Kaypro and TRS-80 models.. mostly > due to the fact that CP/M was written to it. > Use of the Z80 in the mainstream TRS-80 models (1 and III) had little or nothing to do with CP/M. The special CP/M with a non-standard TPA needed for the Model 1 and III was just about useless, since it would only run special TRS-80 versions of CP/M software. There were third-party mods for the Model 1 and III to run a normal CP/M, but only a tiny fraction of TRS-80 users did that. CP/M may have been more of a factor for the Model II/12/16/6000, which could run a normal CP/M without any hardware mods, as could the later Model 4 and 4P. Most Model II family machines I saw in the wild were used to run Radio Shack's accounting and business software on TRS-DOS II; few used CP/M, possibly because there were much lower cost CP/M systems available elsewhere. Most Model 4 owners I knew didn't do any serious CP/M use on it, and mostly used the 4 as an improved-spec III running TRS-DOS/LDOS/etc.
