INFORMATION PROCESSOR, BASIC SYSTEM PROGRAM REWRITING METHOD OF INFORMATION PROCESSOR, AND RECORDING MEDIUM RECORDED WITH BASIC SYSTEM PROGRAM REWRITING PROGRAM OF INFORMATION PROCESSOR

摘要

PROBLEM TO BE SOLVED: To provide an information processor capable of rewriting its BIOS program easily without confusing the user by preventing the processor from being disabled to start owing to a failure in the rewriting of the BIOS. SOLUTION: A BIOS ROM 2 is =2 times as large as the BIOS program size, the BIOS program is held in two divided areas A and B of the BIOS ROM 2 respectively, and the system side is enabled to access only a half area of the BIOS ROM. Further, an address switching circuit 1 is provided between the BIOS ROM 2 and the address bus of the system so that both the area can selectively be accessed.