>
> Can somebody explain to me about this feature?  I know nothing about
> it at all.

PCMCIA is like NuBus or PCI for a Laptop. It's a bus that you plug 
PCMCIA cards into. They're generally accessible from the outside, 
allowing you to hot-swap cards (and thus, features)

The shorter terms for this are PC-Card and CardBus (shortened since 
People Can't Manage Computer Industry Acronyms) :)

> Does
> that mean I would _have_ a PC card in there, or only that I could use
> one if I had it?  And if I had one, what might I use it for?
>

You should have 1 or 2 _slots_, to plug _cards_ into. The 16-bit cards 
(Type I, Type II, and Type III) are limited to things you'd see on a 
PeeCee's ISA bus - Ethernet (10Mbps), Modems, Wireless Ethernet, 
CompactFlash readers, and so forth.

> And then the upgrade changes the slot to a 32-bit one.  The webpage
> says then I can use all sorts of things with it, including a firewire
> card and a USB card.  Do these cards get _installed_ into the slot,
> or do you just put them in like a floppy and when you're done you
> eject them?

You answered your own question. They go in like solid-state floppy 
disks. They mount on the desktop just like HD, FD, Servers, and eject 
when you trash 'em. The iBooks & TiBooks have one CardBus slot *inside* 
for Airport. In that case, the card gets 'installed.'


> I particularly want to understand this because I too have a camera
> that uses flashcards, and I like the idea of being able to download
> pictures from the flashcard into the 2400.  How does it work -- Do
> you need to put in a specific card into the PC card slot that's just for
> reading flashcards, and you put the flashcard into _this_ card?  And
> it all takes place _inside_ the 2400?

Yup.  :)

>
> Can flashcards only be read from a card in a 32-bit slot, not a
> 16-bit one (or would it just be slower in 16-bit one?)?
>

I'm pretty sure there's backwards compatibility, but as far as 
performance, I don't know.

> I'd be grateful for any explanations.  I can see that people really
> appreciate their 2400's PCMCIA slot, and I would like to understand
> just what it is and what makes it such a valuable feature.
>

A weird and wonderful thing. I may be a bit wrong in this information 
though, since I only have experience with my 1400's PCMCIA slots. 
(sorry, mentioned a forbidden 'book   :p )

Hope that helps.
-Andy
-----

"... I realized that when they used the mouse, they were pointing. 
Pointing, and tapping the button with the finger they were pointing 
with ... there was no mental model for pointing with more than one 
finger. So we got rid of the two-button mouse ..."
Larry Tesler of Apple Computer on the mouse.


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