PCMCIA voltage key.

Ralf Findeisen rffn@gmx.net
Tue Mar 23 22:32:25 CET 2004


Right, PCMCIA is basically a port of the 16 bit ISA bus to a different form 
factor with plug and play. Cardbus is the next step of evolution, 32 bits, 
a few extensions to the protocol IIRC. From the top of my head I don't 
recall, if there are 3.3V 16 bit card at all (don't think so). Remains the 
question, if there are 3.3V only CF cards. Anybody had a look in the CF 


On Sun, 21 Mar 2004 14:21:18 -0500, Smith, Todd <Todd.Smith@camc.org> 

> Hello Oleg,
> It is probably a CardBus card instead of a PC Card since the CardBus 
> cards
> were keyed to keep from blowing them in older PC Card 5V bus
> Todd Smith <todd.smith@camc.org>
> -----Original Message-----
> From: Oleg Gusev
> To: jornada820@lists.linux.it
> Sent: 3/20/2004 12:37 PM
> Subject: PCMCIA voltage key.
> I have just realized that it is impossible to insert the low voltage 
> keyed PCMCIA card in j820. What does that mean ? AFAIK, the CF doesn't 
> care if it is fed with 3.3V or 5V. Can we
> simply assume that everything insertable in j820 must
> work with 5V, and later lower the voltage if the card is capable of 3.3V? 
> I don't (yet) know what wince is doing, but the hardware is functional 
> there, while
> in linux some things are broken.
> Oleg.

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