From Sinclair Wiki
Revision as of 13:59, 10 May 2020 by Zub (talk | contribs) (Internal use of CP/M at Sinclair Research)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

CP/M is an operating system developed by Digital Research, Inc., originally released in 1974.

The ZX Spectrum +3 included CP/M support in ROM. The version included is CP/M Plus, which provides compatibility for programs written for the older CP/M 2.2, matching that provided by the Amstrad CPC.

CP/M 2.2 compatibility was available for the SAM Coupé using Pro-Dos. This did not license the original CP/M code, but was a reimplementation of the interfaces provided by CP/M.

CP/M was used by Sinclair Research for the development of the ZX Spectrum 128, in the form of a Z80 expansion card [1] capable of supporting two instances of CP/M, attached to the corporate VAX-11/780. If two instances were in use, a CP/M system could be emulated using the VAX's own CPU, but used a great deal of processing power, which was discouraged, as by the mid-1980s, the same VAX was used heavily within Sinclair Research as their corporate computing environment, including email. The Microsoft M80 macro-assembler and L80 linker were used to assemble and link the ZX Spectrum 128's ROM image.

External link