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CP/M

681 bytes added, 13:59, 10 May 2020
Internal use of CP/M at Sinclair Research
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 [https://www.zdnet.com/article/the-zx-spectrum-birthday-memories/] 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.
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