CP/M
From Free Knowledge Base- The DUCK Project: information for everyone
CP/M, sold by Digital Research, Inc. of Pacific Grove, California, is very different from other software. For one thing it isn't written for any particular system. There are versions currently available for most of the popular small computers.
CP/M is also different in that it carries a substantial cost. It sells for $100 direct from Digital Research, and a version for the TRS-80 is priced at $150 from FMG Corporation. Lifeboat Associates of New York offers versions for many computers. Their price is $145.
While large corporations are