Auto-switching device for CPU logic circuits

Details Auto-switching device for CPU logic circuits Auto-switching device for CPU logic circuits

1992-05-20

1995-04-18

Richardson, Robert L.

Boots, shoes, and leggings

395500, 3642382, 364230, 3642306, 364231, G06F 1300

Patent

active

054086116

ABSTRACT:
An auto-switching device for CPU logic which automatically senses the kind of CPU, and sets the timing margin according to the sensed kind of CPU, and at the same time switches the CPU logic so that a system can be operated in accordance with the sensed kind of CPU in an IBM PC-compatible system using CPUs of the i80486SX, i80487SX and i80486DX type produced, for example by Intel Co. The auto-switching device is constituted by a CPU socket capable of mounting CPU chips of the i486DX, i486SX chip and the like types and being mounted for multiple use. A ROM having built-in software for detecting the kind of CPU at the time of initial operation and a decoder providing the address of a storage medium for storing information about the kind of CPU detected by the software. A latch stores information about the kind of CPU detected by the software according to the output signal and a PAL (Programmable Array Logic) switches the CPU signal defined by one another at the different position of the CPU socket according to the kind of CPU for operating the system.

REFERENCES:
patent: 4967346 (1990-10-01), Freidin
patent: 5163145 (1992-11-01), Parks

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