Personal computer having normal and high speed execution modes

Details Personal computer having normal and high speed execution modes Personal computer having normal and high speed execution modes

1984-06-27

1988-02-23

Chan, Eddie P.

Boots, shoes, and leggings

G06F 900, G06F 1300

Patent

active

047274913

ABSTRACT:
A personal computer is disclosed having a high speed microprocessor which executes in either a FAST mode or a SLOW mode application programs written for a slow speed microprocessor. The slow speed microprocessor contains a pre-fetch queue that is smaller than the pre-fetch queue of the high speed microprocessor. A logic means is included, responsive to a mode select signal for controlling the wait state of said high speed microprocessor when in the SLOW speed mode so that every other word accessed to said RAM memory requires two consecutive word accesses to the same memory address to obtain the contents of the addressed location thereby enabling said high speed microprocessor to execute application programs in the SLOW mode, on the average, at substantially the same speed as the program normally runs on the slow speed microprocessor.

REFERENCES:
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patent: 4180854 (1979-12-01), Walden et al.
patent: 4218754 (1980-08-01), Schaeffer
patent: 4366540 (1982-12-01), Berglund et al.
patent: 4435757 (1984-03-01), Pross, Jr.
patent: 4438488 (1984-03-01), Shibayama et al.
Patent Abstracts of Japan, vol. 6, No. 70.
IBM Technical Disclosure Bulletin, vol. 27, No. 3, Aug. 1984, pp. 1695-1696.
IBM Technical Disclosure Bulletin, vol. 26, No. 11, Apr. 1984, pp. 5788-5789.
EDN Electrical Design News, vol. 23, No. 5, Mar. 1978, pp. 42-46.

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