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From: oster@well.sf.ca.us (David Phillip Oster)
Newsgroups: comp.sys.mac.programmer
Subject: Re: What's the differance between serial Port A & Port B?
Message-ID: <21466@well.sf.ca.us>
Date: 2 Nov 90 09:29:58 GMT
References: <57715.272d5199@pttrnl.nl>
Organization: Whole Earth 'Lectronic Link, Sausalito, CA
Lines: 15

>error -98
this probably means that appletalk is turned on. Use the Chooser to turn it
off.

On the original 128K mac, at baud rates above 9600 baud, during floppy access,
port B would loose data, but port A was specially checked by the floppy
driver. I would be surprised if this were still a concern.

The ports differ slightly in the power available on the auxiliary control
lines, but unless you are designing hardware to run off power scavenged
from the serial port (like Apple's MIDI interface does) you won't have to
worry about this.
-- 
-- David Phillip Oster - Note new signature. Old one has gone Bye Bye.
-- oster@well.sf.ca.us = {backbone}!well!oster