Peripheral devices such as a mouse, keyboard, printer, modem, sound card and floppy drive use IRQs (Interrupt Requests) to communicate with the computer system. The limited number of IRQs available in PCs to run these peripheral devices, like scanners, is an industry-wide challenge. When a compatible IRQ is not available, the HP ScanJet scanner can be installed using Real Mode Drivers instead of Protected Mode Drivers. In most cases, the installation of Real Mode Drivers does not affect performance, but occasionally, users report a change in scanning speed.
Normal installation of the HP Scanning Software, on Windows 95, requires an IRQ. If the installer is unable to obtain an IRQ that is compatible with the HP ScanJet scanner, the installer reconfigures the HP Scanning Software to run with Real Mode Drivers.
Please refer to the section in the ReadMe file titled, "If Your Computer Has No Compatible IRQs (Windows 95 Only)", for more information.
