Reprogrammable cartridge memory with built-in identification circuitry and programming method
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United States of America Patent
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Jul 14, 1987
Issued Date -
N/A
app pub date -
May 19, 1986
filing date -
Mar 17, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A reprogrammable plug-in semiconductor memory cartridge for use in a personal computer system, the cartridge being reprogrammed without removing the circuitry from the cartridge. The cartridge uses a keying-locking circuitry, such as a resistor-capacitor circuit having a unique time constant which must be detected by a cartridge programming system before allowing the programming operation to start. Thus access to a programming system program library is limited only to cartridges having the above-mentioned keying-locking circuitry. A cartridge retailer maintains a master program library and a limited number of such blank cartridges rather than maintaining a large inventory of programmed cartridges.
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