Computing Dictionary

GE-645 definition

A computer built by General Electric, the successor to the GE-635, designed to provide the extra CPU features required by the Multics project.
The GE-645 was designed in 1965 by John Couleur and Edward Glaser at MIT. It had several security levels and instructions for handling virtual memory. Addressing used an 18-bit segment in addition to the 18-bit address, dramatically increasing the theoretical memory size and making virtual memory easier to support.
Design of the GE-645's successor, the GE-655, started in 1967.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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