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SE7221BK1-E Technical Product Specification
4.2
Super I/O
National Semiconductor* PC87427Super IO device contains all of the necessary circuitry to
control two serial ports, one parallel port, floppy disk, PS/2-compatible keyboard and mouse and
hardware monitor controller. The baseboard implements the following features:
GPIOs
Two serial ports
Floppy
Keyboard and mouse
Local hardware monitoring
Wake up control
System Health Support
4.2.1
Serial Ports
The board provides two serial ports, an external serial port, and an internal serial header. The
following sections provide details on the use of the serial ports.
4.2.1.1
Serial A
Serial A is a standard DB9 interface located at the rear I/O panel of the server board, below the
video connector. Serial A is designated by as "Serial A" on the silkscreen. The reference
designator is J8A1.
4.2.1.2
Serial B
Serial B is an optional port, accessed through a 9-pin internal header (J1B1). A standard DH-10
to DB9 cable can be used to direct serial B to an external connector on any given chassis. The
serial B interface follows the standard RS232 pin-out. The baseboard has a "Serial_B"
silkscreen label next to the connector and is located beside the PCI32 5V connector.
4.2.1.3
Floppy Disk Controller
The floppy disk controller (FDC) in the Super IO is functionally compatible with floppy disk
controllers in the DP8473 and N844077. All FDC functions are integrated into the Super IO
including analog data separator and 16-byte FIFO. The baseboard provides a standard 34-pin
interface for the floppy disk controller.
4.2.1.4
Keyboard and Mouse
Two external PS/2 ports, located on the back of the baseboard, are provided to access the
keyboard or mouse functions.
4.2.1.5
Fast X-Bus extension for boot flash, memory and I/O.
The fast X-bus Supports I/O and memory read/write operations and 8 bit data bus, 28-bit
addressing.
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