* The modem that originally shipped with the PowerBook 140 and 170 was called the Apple Fax/Data Modem.
* The latest version of the Software that shipped exclusively for the Apple Fax/Data Modem is called FAX Sender 1.0.3.
* The latest supported Software for this modem is Express Modem 1.5.5 and fulfillable through CR fulfillment option.
* Telecom 2.3.2 was tested with the modem and works if the PowerBook is running 7.1 or later.
* Earlier versions of the Express Modem software had to be "Added" over the top of the FAX Sender Software (not true with 1.5.5 and telecom 2.3.2)
* Express modems do NOT work in PowerBook 100, 140, 145, 145b, 150 or 170 models.
* To identify a PowerBook modem, open a modem application like Zterm and enter the command AT10 or ATI4. The response will identify "data/send FAX" for the Apple Fax/Data Modem. Using the same command with an Express Modem, the response is: "APPLE EXPRESS MODEM....."