Technical information

9
Super I/O Controller
The PC87309 Super I/O Controller from National Semiconductor is an ISA Plug and
Play compatible, multifunction I/O device that provides the following features:
•= Serial ports
= Two 16450/16550A-software compatible UARTs
= Internal send/receive 16-byte FIFO buffer
= Four internal 8-bit DMA options for the UART with SIR support (USI)
•= Multimode bidirectional parallel port
= Standard mode: IBM and Centronics compatible
= Enhanced parallel port (EPP) mode with BIOS and driver support
= High-speed extended capabilities port (ECP) mode
•= Floppy disk controller
= PC8477 compatible, which contains a superset of the floppy disk
controllers in the DP8473 and N82077.
= 16-byte FIFO
= PS/2 diagnostic-register support
= High-performance digital data separator (DDS)
= PC-AT and PS/2 drive-mode support
•= Keyboard and mouse controller
= Industry standard 8042AH PC87911compatible
= General-purpose microcontroller
= 8-bit internal data bus
By default, the I/O controller interfaces are automatically configured during boot up.
The I/O controller can also be manually configured in the Setup program.
Serial Ports
Two compatible 9-pin D-Sub serial port connectors, both are located on the back IO
panel see Figure 2.
Parallel Port
The connector for the multimode bidirectional parallel port is a 25-pin D-Sub
connector located on the back panel. In the Setup program, the parallel port can be
configured for the following:
•= Compatible (standard mode)
•= Bidirectional
•= Extended Parallel Port (EPP) Levels 1.7 & 1.9
•= Enhanced Capabilities Port (ECP)