Date: Thu, 27 Jun 2002 07:41:15 +0000
From: "neil barnes" <[EMAIL PROTECTED]>
Subject: Re: [LIB] L50 & USB?


>Date: Wed, 26 Jun 2002 15:06:43 -0500
>From: John Musielewicz <[EMAIL PROTECTED]>
>Subject: Re: [LIB] L50 & USB?
>
>On Wed, 26 Jun 2002 08:55:19 -0700, you wrote:
>
> >Date: Wed, 26 Jun 2002 17:48:40 +0200
> >From: franklin <[EMAIL PROTECTED]>
> >Subject: L50 & USB?
> >
> >Hi all,
> >
> >Anybody have a solution for connecting a USB hub to a L50?
> >
> >I have found PCMCIA cards with 2 USB connectors, but they are CardBus 
>types
> >unfortunately, and the L50 doesn't support CardBus.
> >
> >Any ideas?
> >
> >I will be holidaying with my L50 in tow and a digital camera, and I was
> >thinking og buying an extra credit card-sized camera for my son, but they 
>seem
> >to only support USB.
> >
> >tia+br
> >
> >Franklin
>
>It might be possible but a driver wold have to be written. The 16 bit
>bus would have to be doubled in software to 32 bits. Its done
>sometimes with an 8 bit bus to get 16 bits and seems to work on 16 bit
>cards. Donno if it'll work for cardbus. Depends on if the actual
>pinout is differant on a cardbus and 16 bit slot. But as far as I know
>it isn't since the pcmcia revisions have all been in software since
>about 2.0

The pinouts are not only different, but they're selected by the driver chip 
depending which system is required. The data/address bus stuff isn't (e.g.) 
multiplexed onto the same pins, it uses different pins in different 
positions. Without the hardware, you're stuffed. And, strictly, a Cardbus 
card shouldn't even *fit* into a PCMCIA 16-bit slot.

There main problem with USB cards seems to be that the maximum data rate is 
too low on the sixteen bit systems. According to the PCMCIA-CS howto, the 
maximum rate is only about 2-3Mb/s, irrespective of the hardware.

Neil

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