I'm not familiar with your PDA but it has a USB connection that may give you (raw) access to the internal memory.
Connect the unit to a PC (should work with a Mac too) and see if the system recognizes the internal memory.
If it does, you should be able to copy the memory contents to disk in some form but even then, it may not be something you can easily use.
I did find some info on it here:
Visor Prism
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