Introduced in March of 1983, the CompuPro S-100 system was one of the last and most expensive CP/M systems that appeared. It was a very flexible system that could accommodate a wide range of S-100 bus cards built by a wide range of manufacturers.
CompuPro itself manufactured a large number of S-100 cards. Its S-100 system could be fitted with either 8-bit and/or 16-bit processor cards. One of the best-selling cards was a dual processor 8808 + 8085. This allowed running both 8 bit CP/M and 16 bit MP/M software at a speed of 2 or 5 MHz in a multitasking environment.
The CompuPro S-100 included several cards from 8088 + 8085 to Z80 to 80286 at a speed of 4 MHz and up. There are 2 8" floppy disk drives. The three major options for operating systems were CP/M, CP/M-86, and MP/M. The machine had 16 KB of RAM, which could be expanded to 1 MB. Depending on how the computer was configured, its price ranged from around $5,500 up to almost $20,000.
This particular CompuPro S-100 was owned by the author and journalist Jerry Pournelle (1932-2017) who dubbed it Ezekiel II (also Zeke II) and used it writing, including preparation of his columns for Byte magazine. Pournelle first mentioned the machine in his "User's Column" for March, 1983.
Reference
Jerry Pourelle, "User's Column: Sage in Bloom, Zeke II, CBIOS Traps, Language Debate Continues. Byte, vol 8 #3, March 1983, pp. 218-238, 242, 244.
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