The PCI bus 8255 adapter is a 32-bit PCI bus adapter with Plug and Play (PnP) features, it is a programmable I/O interface for PC/486, Pentium or compatible computers. The PnP features let hardware configuration for IRQ and I/O address is detected by BIOS automatically, you don¡¦t need set switch and jumper.

The PCI bus 8255 adapter provides total 6 digital I/O ports, each I/O port contains 8 I/O lines, and can be set either input or output by the user¡¦s program. The signal assignments of PCI bus 8255 adapter is designed as standard configurations, so that it can be used to connect to the 8255 terminator board for several applications.

4 Features of 8255/8254
*32-bit PCI bus with Plug and Play (PnP) features
*Programmable I/O control functions
*Up to 48 I/O lines.
*Maximum of 10 KHz counter rate.
*Support several operating modes that are programmable.
*Provides DII device driver for PnP features.