Really, I'd like to enable the modem with an pic output and talk to it over
a data bus much like a serial modem (the normal commands ATH etc). I'm also
thinking about attaching one of these to a gameboy advance sp...to surf the
internet...maybe.

Justin

-----Original Message-----
From: Mike Harrison [mailto:mike@WHITEWING.CO.UK]
Sent: Tuesday, 15 April 2003 3:20 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: PCMCIA modem connections


On Mon, 14 Apr 2003 12:01:48 -0400, you wrote:

>> Hi All
>> I would like to use an old pcmcia modem I have to connect to a
>> pic. The pic
>> will use the modem to dial a phone number. I have this already
>> working with
>> a normal serial modem but would prefer to use the pc card because of its
>> size.
>>
>> Does anyone know what pin numbers to use on the card or how to
communicate
>> with the card at all? I have done a small search and come up with some
>> standards that are gobblygook to me.
>
>        Think many I/Os.

Not really - remember most of the PCMCIA address lines are for ROM space
access, which you don't
need. Probably about 4-6 for the I/O address, data bus may well be 8 bit,
and you can use a latch
off the data bus  for the address bus if required so you could probably get
it down to a dozen or so
I/Os. If all else fails, use a second low-end PIC as a 'pcmcia-to-serial'
converter - a 16C55 ought
to do it easily

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