Sony PCGA-UMS1 Primary User Manual page 30

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2 Press the Release button a second time. The PC Card slot protector pops out.
When you use a Type III PC Card, you need to remove both the top and bottom PC
Card slot protectors.
PC Card slot protector
3 Insert the PC Card into the PC Card slot.
4 Verify that the front label of the PC Card is facing up.
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