On Mon, Aug 16, 2004 at 09:42:55PM +0100, Tony Duell wrote:
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.
Somewhere at home I have the instruction card for twiddling KDF11 microcode.
-ethan
--
Ethan Dicks, A-130-S Current South Pole Weather at 16-Aug-2004 21:20 Z
South Pole Station
PSC 468 Box 400 Temp -83.5 F (-64.2 C) Windchill -129.7 F (-89.90 C)
APO AP 96598 Wind 15.6 kts Grid 035 Barometer 669.6 mb (11022. ft)
Ethan.Dicks(a)amanda.spole.gov
http://penguincentral.com/penguincentral.html