The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 2003
Filed:
Mar. 30, 1999
Hitoshi Ogata, Sakai, JP;
Sanyo Electric Co., Ltd., Moriguchi, JP;
Abstract
A computer system comprises a microcomputer and external memory means in communication with the microcomputer for storing various programs and various items of data. The microcomputer comprises a nonerasable ROM having stored therein a basic program and basic data indispensable to the operation of the system, a RAM for storing various programs or various kinds of data, a CPU for executing programs and processing data, and an interface circuit for providing communications with external devices. The external memory means has stored therein a modification program for modifying a portion of program data contained in the basic program, and a modification starting address indicating a location in the basic program where the modification of the basic program by the modification program is to be started. The CPU has an address interrupt function for processing an interrupt at a predetermined interrupt address. The microcomputer modifies the basic program by transferring the modification program from the external memory means to the RAM, storing the modification starting address in the CPU as the interrupt address, and executing a command to jump to a head address of the modification program in the RAM for an address interrupt.