Computer system having BIOS (basic input/output system)-ROM (Read Only Memory) writing function
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United States of America Patent
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May 28, 1996
Grant Date -
N/A
app pub date -
Apr 28, 1994
filing date -
May 13, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A flash memory used as a BIOS-ROM has a main block storing a BIOS and a boot block storing minimum programs executed in initializing the system. Upon a power-on operation, when a rewriting unit is connected to an expansion bus connector, a new boot block stored in a ROM of the rewriting unit is written in the flash memory. Upon the power-on operation, a key depression detecting routine in the boot block is executed to check whether a predetermined key is depressed. If the predetermined key is determined to be depressed, a rewriting program in a floppy disk is loaded in the system and executed, thereby rewriting the content of the main block into the BIOS file stored in the floppy disk.
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