Toshiba V.90 - Manual (Page 20)

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Setup
This chapter describes how to set up your hardware and how to
check the internal modem’s functions. It is written primarily for
users who, for some reason, need to set up the modem again.
Some procedures may vary slightly for users who have a
preinstalled modem.
Hardware Setup
Use the MS-DOS ® or TSETUP program to set the COM port, I/O
address port, and IRQ level. Refer to your computer’s
documentation.
The default settings are:
Device Configuration All devices
Built-in Modem Com 2 (2F8H/IRQ3)