Program modification system in an electronic cash register
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United States of America Patent
Stats
-
Aug 18, 1987
Grant Date -
N/A
app pub date -
Apr 22, 1983
filing date -
Apr 26, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronic cash register includes a mask ROM for memorizing a fixed operation program. First through third RAM's are provided for storing information for partly modifying the operation program memorized in the mask ROM. The first RAM stores information which indicates an address of the mask ROM at which the program should be modified. The second RAM stores a modified program. The third RAM stores an address table which correlates the address of the mask ROM at which the address should be modified, and the addresses of the second RAM at which the modified program is stored. A control system performs an operation in accordance with the operation program memorized in the the mask ROM with reference to the first RAM. When the first RAM indicates the modification, the operation is conducted in accordance with the modified program information and associated address table stored in the second and third RAM's.
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