Product: IBM ISA V.34 Host Processor Controlled Data / FAX Modem (P/N 42H4334). The file "ISAHPC31.EXE" is a self extracting zip file, which when executed will create the file for the IBM ISA V.34 Host Processor Controlled Data / FAX Modem Windows 3.1 Installation Disk. Once the files have been extracted run setup to install. Note: After the setup program successfully installs the software drivers, you must reboot windows to activate the modem in order to use it. The IBM ISA V.34 Data/FAX modem software is designed to operate under Windows 3.1x enhanced mode environment. For reliable operation your Data and Fax software must be set for Hardware Flow Control. The default IRQ is IRQ 3. MODEMKIT program in this group is provided for you to select a different IRQ in case of any conflict