
Chapter 9: Card Slots
Card Slots
69
Psion Mobile Devices Developers Guide
9.1 Card Slots
The Mobile Devices SDK provides functions that control the power status of card slots. There are situations,
such as in hospitals or airports, where it is necessary to temporarily prevent radios from transmitting. Using
SDK functions to disable power to the card slot containing the radio achieves this. Most Psion hand-held
and vehicle-mount computers have this feature available on all card slots; however, there are some excep-
tions. Refer to the tables below for details.
For those card slots that cannot be powered off, the driver for the card slot is unloaded, and all further
attempts by the application to communicate with the card slot are ignored; however, the card slot remains
fully powered, so the outcome depends on the behaviour of the radio card under these circumstances.
The following table lists the Psion computers, their card slots, and whether the card slots can be controlled
by the SDK. The “SDK Hardware Name” is the specific string used with the get / set method to identify the
card slot.
7530
7535
1
On the7535, the SD-MMC card slot cannot be powered off. The driver for the card can be unloaded and
further activity on the slot is ignored, but the device is still powered and may still be active in some way
(e.g. a radio may still transmit/receive).
2
On the 7535, calls to the power state setting method for PCMCIA Slot1 are ignored.
8515
8525/8530
Card Slot Type SDK Hardware Name
Software Control Of
Power State
Cards Accepted
SDIO SD-MMC Yes SD card
MMC card
Compact Flash PCMCIA Slot0 Yes CF card
Card Slot Type SDK Hardware Name
Software Control Of
Power State
Cards Accepted
SD-MMC SD-MMC Yes
1
SD card
MMC card
CF PCMCIA Slot0 Ye s
2
CF card
Card Slot Type SDK Hardware Name
Software Control Of
Power State
Cards Accepted
MicroSD SD-MMC No MicroSD card (memory
only)
Compact Flash PCMCIA Slot0 Yes
Card Slot Type SDK Hardware Name
Software Control Of
Power State
Cards Accepted
SD-MMC SD-MMC Yes SD card
MMC card
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