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:
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Serial ports
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Two 16450/16550A-software compatible UARTs
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Internal send/receive 16-byte FIFO buffer
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Four internal 8-bit DMA options for the UART with SIR support (USI)
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Multimode bidirectional parallel port
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Standard mode: IBM and Centronics compatible
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Enhanced parallel port (EPP) mode with BIOS and driver support
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High-speed extended capabilities port (ECP) mode
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Floppy disk controller
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PC8477 compatible, which contains a superset of the floppy disk
controllers in the DP8473 and N82077.
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16-byte FIFO
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PS/2 diagnostic-register support
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High-performance digital data separator (DDS)
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PC-AT and PS/2 drive-mode support
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Keyboard and mouse controller
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Industry standard 8042AH
PC87911
compatible
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General-purpose microcontroller
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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:
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Compatible (standard mode)
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Bidirectional
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Extended Parallel Port (EPP) Levels 1.7 & 1.9
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Enhanced Capabilities Port (ECP)
