Thanks Adam and Mike
I wonder if I can get the pinout and then talk to the card through windows
(or dos), ie send commands to it and see what it does...

Justin

-----Original Message-----
From: Mike Harrison [mailto:mike@WHITEWING.CO.UK]
Sent: Tuesday, 15 April 2003 12:56 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: PCMCIA modem connections


On Mon, 14 Apr 2003 10:44:32 -0400, you wrote:

>You can view the pinout here:
>
>http://sunsite.tut.fi/hwb/co_Pcmcia.html
>
>Notably, there are no serial lines.  The PCMCIA is essentially a 16 bit
>data bus that's very similar to ISA.  The major differences allow for
>hot-swapping, automatic card identification, and IIRC allows the OS to
>change the I/O space and IRQ usage of the card itself.

The IO address and IRQ mapping is done by the PC host controller, not the
card. The controller maps
the card's fixed address space within the PCMCIA bus to a configurable place
in the PC's I/O memory.
This will not be an issue when driving from a PIC.

>I suspect you'll find that your old modem card has or emulates a generic
>16550 UART.  You need to determine if it uses a fixed I/O address, or if
>it's configurable.  If it's fixed you may have luck just talking
>directly to the 16550.
This should work - the address is likely to be at the start of the PCMCIA
I/O address space.

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