Super I/O Controller; Serial Ports - Intel AN430TX - Motherboard - ATX Technical Product Specification

NOTE
If you connect an LS-120 drive to an IDE connector and configure it as the "A" drive and
configure a standard 3.5-inch floppy as a "B" drive, the standard floppy must be connected to the
floppy drive cable's "A" connector (the connector at the end of the cable).

1.8 Super I/O Controller

The PC87307VUL Super I/O Controller from National Semiconductor is an ISA Plug and Play
compatible (see section 5.1 for compliance level), multifunction I/O device that provides the
following features:

Serial ports:

Two 16450/16550A-software compatible UARTs
Send/receive 16-byte FIFO
Four 8-bit DMA options for the UART with Slow Infrared Support (USI)
Ring indicator support for both serial ports
Multimode bidirectional parallel port
Standard mode, IBM
Enhanced Parallel Port (EPP) mode with BIOS and driver support
High-speed Extended Capabilities Port (ECP) mode
Floppy disk controller
DP8473 and N82077 compatible
16 byte FIFO
†
PS/2 diagnostic register support
CMOS disk input and output logic
High performance digital data separator (DDS)
†
PC-AT and PS/2 drive mode support
Keyboard and mouse controller
Industry standard 8042A compatible
General purpose microcontroller
8 bit internal data bus
Support for an IrDA and Consumer IR-compliant infrared interface
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.
1.8.1 Serial Ports
The motherboard has one 9-pin D-Sub serial port connector located on the back panel, and one
keyed 10-pin header located on the motherboard for cabling to the back panel. The 16540 and
16550A compatible UARTs support data transfers at speeds up to 921.6 Kbits/sec, while the
extended UART mode supports data rates up to 1.5 Mbits/sec.
† †
and Centronics compatible
Motherboard Description
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