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A replaceable ink cartridge for an ink jet printing system having an ink supply station with an ink receptacle and a printer electrical connector. The cartridge has a housing removably matable with the ink supply station. An electrical circuit and a connected cartridge electrical connector reside on

A replaceable ink cartridge for an ink jet printing system having an ink supply station with an ink receptacle and a printer electrical connector. The cartridge has a housing removably matable with the ink supply station. An electrical circuit and a connected cartridge electrical connector reside on the housing, and the cartridge electrical connector is matable with the printer electrical connector. An ink reservoir in the housing defines a chamber containing a supply of ink of a selected volume, and has an ink outlet connectable to the printer ink receptacle. An ink level sensor in the housing is connected to the cartridge electrical connector, and detects whether the supply of ink is less than a threshold amount. If so, it generates an "ink depleted" signal.

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[ We claim:] [1.] A replaceable ink cartridge for an ink jet printing system having an ink supply station with an ink receptacle and a printer electrical connector, the cartridge comprising:a housing removably matable with the ink supply station,a digital electronic circuit and a connected cartridge

[ We claim:] [1.] A replaceable ink cartridge for an ink jet printing system having an ink supply station with an ink receptacle and a printer electrical connector, the cartridge comprising:a housing removably matable with the ink supply station,a digital electronic circuit and a connected cartridge electrical connector on the housing, the cartridge electrical connector matable with the printer electrical connector;an ink reservoir in the housing defining a chamber containing a supply of ink of a selected volume;the reservoir having an ink outlet connectable to the printer ink receptacle; andan ink level sensor in the housing connected to the digital electronic circuit, and operable to detect whether the supply of ink is less than a threshold amount, and to generate an "ink depleted" signal in response to detecting that the supply of ink contains less than the threshold amount.