>The AV macs and PowerMacs have serial ports greater than 57.6Kbps.
>The Internal ports on 100 series powerbooks is also greater, but the
>blackbirds (500 series) internal ports are slow which is why only the
>100 series PowerBooks can use the PowerPort Platinum.
>
>        There are Nubus cards that offer extra serial ports but I don't
>know much about them.

i don't know what company makes them, but you can buy something called a
hurdler card for the mac... it gives you 4 230k serial ports. there is also
an external scsi-based version. they're made mainly for bbb uses...

- josh