Datamax PE Operator's Manual page 28

Holding the FLASH Cartridge with the label facing up,
insert it into the connector, see Figure 3-10. Push firmly,
but do not force it, doing so could damage the cartridge and
socket.
Figure 3-10 Inserting the Memory Cartridge
Close the Panel and secure it with the screws. Plug in and
turn 'on' the printer. The printer will refer to the FLASH
Cartridge as Module B.
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PE Series Operator's Manual