The baud rate on the Apple 1200 modem is not unalterable, although how to
alter the rate is not very obvious: you alter the rate by passing data to the
modem at the rate you want the modem to transmit data. From whichever program
you use to send data to the modem, it determines the baud rate of the data it
recieves and sets itself at that rate. For example, when you set the baud
rate of the LisaTerminal program to 300 and instruct the program to auto-dial,
LisaTerminal sends the auto-dial message to the modem at 300 baud; from the
speed of this message, the modem assumes that you want to be communicate at
300 baud; the modem then alters its rate to 300 baud. Subtle, no? But here's
the catch: if you change the baud rate in the program without turning off the
modem first, the modem ignores the messages sent to it at the new baud rate.
You must turn off the modem if you are going to change the baud rate.