HP Workstation x2000 hp workstation x2000 - Technical Reference and Troublesho - Page 67

System Board The Input/Output Controller Hub 2 (82801BA) The Super I/O Controller The Super I/O chip (NS 87364) provides control for two FDD devices, two serial ports, one bidirectional multimode parallel port, and a keyboard and mouse controller. Device Super I/O Index Data 2Eh 2Fh Serial/Parallel Communications Ports The 9-pin serial ports (whose pin layouts are depicted on page 148) support RS-232-C and are buffered by 16550A UARTs, with 16-byte FIFOs. You can program them as COM1, COM2, COM3, COM4, or you can disable them. The 25-pin parallel port (also depicted on page 149) is Centronics compatible, supporting IEEE 1284. You can program the port as LPT1, LPT2, or you can disable it. It can operate in the 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). FDC The integrated floppy disk controller (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 IBM-compatible. It has an A and B drive-swapping capability and a non-burst DMA option. Keyboard and Mouse Controller The computer has an 8042-based keyboard and mouse controller. See page 147 for connector pin layouts. Chapter 2 67