G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 13/40 (2006.01) G06F 15/78 (2006.01)
Patent
CA 2112752
ABSTRACT SIGNAL ROUTING CIRCUIT FOR MICROPROCESSOR UPGRADE SOCKET A computer system can be upgraded from a 386 main CPU to a 486 microprocessor without exchanging the processor card or removing the 386 microprocessor. The computer includes a single empty socket which can be fitted with a 486SX, 487SX, or 486DX microprocessor. Any of these microprocessors can be plugged into the socket, which causes the cache system which includes an 82395 to enter a tri-state test mode and suspends the operation of the main CPU. To correct for the variations in the pin arrangements of each processor, various system signals are routed using switches to different pins for different microprocessors. In addition, specific system signals are rerouted among the system components using a set of six switches to provide for proper operation when the socket is empty and when it is occupied. By appropriately setting all of the switches, the correct signals are provided to each pin of the upgrade microprocessor. While the cache system remains in test mode, the main CPU remains fundamentally inactive, and the upgrade processor controls the computer system.
Compaq Computer Corporation
Finlayson & Singlehurst
LandOfFree
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