Microprogram load unit having alternative backup memory sources

Details Microprogram load unit having alternative backup memory sources Microprogram load unit having alternative backup memory sources

1985-08-22

1993-08-17

Clark, David L.

Boots, shoes, and leggings

364DIG1, 3642685, 3642851, 364DIG2, 3649752, 36496579, G06F 1216

Patent

active

052376877

ABSTRACT:
A microprogram load unit comprising a readable and writable microprogram memory within a central processor unit for storing microprogram, a relatively low speed, readable and writable, nonvolatile memory unit, and a readable and writable memory with battery backup. It is determined whether data of the readable and writable memory with backup has been lost or not when power is turned on. If data loss is not present, microprogram is read out of the readable and writable memory with backup and written into the microprogram memory. If data loss is present, microprogram is read out of the nonvolatile memory unit and is written into the microprogram memory.

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patent: 4393500 (1983-07-01), Imazeki et al.
patent: 4458307 (1984-07-01), McAnlis et al.
patent: 4491914 (1985-01-01), Susaku
patent: 4523295 (1985-06-01), Zato
patent: 4564922 (1986-01-01), Muller
patent: 4584663 (1986-04-01), Tanikawa
patent: 4648066 (1987-03-01), Pitt

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