IBM 5100

From: Nico de Jong <>
Date: Tue Aug 17 00:20:08 2004

From: "Tony Duell" <>
> It is, of course, possible to make a processor where the microcode can be
> changed by the user. Many early graphics workstations (the PERQ, many of
> the Xerox machines, etc) had microcode that was loaded from disk when the
> machine booted. WCS (Writeable Control Store) options were available for
> a few models of PDP11 to allow the user to write microcode.
My first encounter with 8" floppies was with a S/370, IIRC.
There was a vertical floppy drive near the top of the system.
What was that used for ? Microcode, diagnostics, .... ?


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