Computer Hardware
A Type 1 PCMCIA card is:

The same physical size as other PCMCIA cards but configured differently
The thinnest PCMCIA card, measuring 3.5mm in thickness
The thickest PCMCIA card, measuring 10.5mm in thickness
An old standard that is not compatible with the newest laptops
None of these

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Computer Hardware
Whenever you have a hardware resource conflict, it will more likely be an IRQ conflict rather than an i/o conflict because:

I/O addresses cannot conflict
software tends to correct I/O conflicts
the BIOS sometimes has more of a problem controlling IRQs
software tends to mess up IRQs
there are a lot more I/O addresses than IRQs.

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