Portable battery back-up data cartridge

Details Portable battery back-up data cartridge Portable battery back-up data cartridge

1991-05-28

1995-04-18

Voeltz, Emanuel T.

Boots, shoes, and leggings

364187, 368 55, G04G 500

Patent

active

054084210

ABSTRACT:
The cartridge has a memory for containing an information set, a status flag and a buffer for receiving an update to the information set, the update representing a change to only a part of the information set, and a data and power connector for connecting the cartridge to a host computer, the connector being able to receive power from the host computer and exchange data when connected to the host computer. The cartridge includes a power supply election switch including a battery for selectively supplying power from the host computer when the connector is connected and from the battery when disconnected. The update is transferred to the buffer and subsequently from the buffer to the information set in response to the status flag, such that in the event of a disconnection, while the update is being received, the information set is not partially updated. The cartridge may also include a real time clock and a copy of the time when the real time clock was set by the host in the memory, so that the host may use the clock setting of the real time clock if the copy of the time when the real time clock was set is more recent than the time when a clock on the host was set, such that when the cartridge is used between a plurality of host computers, a more accurate and recent clock setting may be transferred between the plurality of host computers by the cartridge.

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