Modems plugged into the serial port of a 3400, 4400, 5400, or 6400 are sometimes not recognized by communications programs. It does not appear that the computer exhibits this behavior with serial StyleWriter printers, QuickTake cameras, or Newton MessagePads. To see if your system exhibits this behavior with a modem:
1) Connect an external modem to the modem port.
2) Make sure the modem is powered off.
3) Restart your Macintosh.
4) Use a communications program such as ClarisWorks, ZTerm, etc. to talk to the modem.
There are two easy workarounds:
- Plug the modem in after the Macintosh restarts.
- Make sure the modem is powered up before starting the Macintosh.