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The Input/Output Controller Hub (82801AA)

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The lg chip (NS 87364) provides the control for two FDD devices, two serial ports, one bidirectional multi-mode parallel port and a keyboard and mouse controller.

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Rst

Mpp

 

 

 

Super I/O

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2Fh

 

 

 

The 9-pin serial ports (whose pin layouts are depicted on page 138) support RS-232-C and are buffered by 16550A UARTs, with 16-Byte FIFOs. They can be programmed as COM1, COM2, COM3, COM4, or disabled.

The 25-pin parallel port (also depicted on page 139) is Centronics compatible, supporting IEEE 1284. It can be programmed as LPT1, LPT2, or disabled. It can operate in the four following modes:

Standard mode (PC/XT, PC/AT, and PS/2 compatible).

Bidirectional mode (PC/XT, PC/AT, and PS/2 compatible).

Enhanced mode (enhanced parallel port, EPP, compatible).

High speed mode (MS/HP extended capabilities port, ECP, compatible).

The integrated(FDC) supports any combination of two of the following: tape drives, 3.5-inch flexible disk drives, 5.25-inch flexible disk drives. It is software and register-compatible with the 82077AA, and 100% IBM-compatible. It has an A and B drive-swapping capability and a non-burst DMA option.

The computer has an 8042-based keyboard and mouse controller. The connector pin layouts are shown on page 137.

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Image 61
HP KAYAK XU800 manual Nlk, Rst Mpp Super I/O 2Eh 2Fh