Juniper Systems Allegro DOS Manual - Manual (Page 66)

Page 3-6 Memory and Data Storage
SRAM Cards
Power
SRAM cards are powered by the Allegro while installed in the PC card
slot. An on-board battery retains data when the card is not being
powered by the Allegro. Some brands have a replaceable lithium battery
(coin type). If you have this type, make sure that the battery is installed
before attempting to use the card. Other brands have a rechargeable
battery that is automatically recharged while it is inside the Allegro. The
rechargeable batteries are not replaceable.
The life of these batteries varies greatly depending on usage and the
memory size of the card. If the lithium battery is drained, the
information stored on the card is lost. When a new battery is installed,
the card needs to be formatted. The manufacturer's instructions that
came with the card should include information on battery life and
recommended changing intervals.
Replacing SRAM Card Batteries
SRAM card batteries are readily available at most stores. Unless the
manufacturer's instructions state otherwise, we recommend that you
change the battery every six months.
Formatting SRAM Cards
SRAM cards come pre-formatted. Files and directories can be copied
onto it just like a standard disk drive. If you need to format a card, enter
the following command into the Allegro from the DOS prompt:
Format D:
❖ Warning: Formatting the SRAM card will delete everything previously
stored on the card. For more information on using FORMAT, refer to the
MS-DOS Help.
Inserting and Removing Cards
For details on how to access the PC card slot and insert and remove
cards, refer to Section 2, Hardware Components, PC Card Slot.