EOS (operating system)

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EOS
Website	?
Company/ developer	ETA Systems
OS family	?
Source model	?
Latest stable release	? / 1986?
Marketing target	Supercomputing.
Available language(s)	?
Supported platforms	ETA10 line of supercomputers
Kernel type	?
Default user interface	Command line interface
License	Proprietary
Working state	Nonexistent.

EOS was the name of an operating system developed by ETA Systems (a spin-off division of CDC) for use in their ETA10 line of supercomputers in the 1980s.

EOS was preceded by and was binary executable compatible with the CDC VSOS operating system for Cyber 205. Like VSOS, EOS had demand paged virtual memory (the VS part) with 2 pages sizes for improved virtual memory performance with the ETA's longer hardware pipelines. VSOS was a batch-oriented operating system, and EOS had to have some interactive features but still retained its batch oriented character. VSOS was not run at very many institutions and its application-oriented performance, while well intended, set its features behind the times because of its limited user base. EOS was written in assembly language (?) like VSOS. The command line appearance of all these systems shares a long lineage going back to UNIVAC EXEC*8.

EOS was poorly received and developed a reputation for problems to the extent that some customers refused to pay for their supercomputer installations.

ETA later released a port of UNIX for the ETA-10 line, which was better accepted by their customer base.