Single shared ROM for storing keyboard microcontroller code port

Details Single shared ROM for storing keyboard microcontroller code port Single shared ROM for storing keyboard microcontroller code port

1994-01-27

1997-02-11

Lee, Thomas C.

395830, 395427, 39549701, 39549704, G06F 1300, G06F 1310

Patent

active

056030550

ABSTRACT:
A shared keyboard and system ROM uses a single ROM for both the keyboard and the system operating system information (BIOS). The shared ROM is never simultaneously used for both of these functions. At initial boot-up, the system processor executes from the shared ROM to copy the system BIOS information to the system Random Access Memory DRAM. Once this copying has been completed, the shared ROM then is used by the keyboard subsystem. Different address ranges are employed in the shared ROM for the keyboard information and for the system BIOS.

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