HP Vectra VT 6/xxx HP Vectra XU 6/xxx and VT 6/xxx PCs - Technical Reference M - Page 21

Devices On The Isa Bus, Ultra I/o Controller

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Plug and Play Plug and Play is an industry standard for automatically configuring the PC's hardware. When you start the PC, the Plug and Play system BIOS can detect automatically which hardware resources (IRQs, DMAs, memory ranges, and I/O addresses) are used by the system-based components. The HP Vectra XU/VT 6/xxx PCs have a "PnP level 1.0A" BIOS and meets the "Windows 95 Required" level for Plug and Play. Accessory boards which are Plug and Play are automatically configured by the BIOS (Windows 3.11) or by the operating system (Windows 95). Error Diagnostics and Suggested Corrective Actions Most problems caused by incompatibilities on PCI accessory boards are detected by the POST during the Power-On sequence. This is described in Chapter 5. DEVICES ON THE ISA BUS The PCI/ISA bridge chip (otherwise known as the system I/O chip, SIO-A) is an Intel S82379AB. It is responsible for transferring data between the PCI bus and the ISA expansion bus. It also houses the controller for the ISA bus, and incorporates the logic for a DMA interface, a DMA controller that supports fast DMA transfers, data buffers to isolate the PCI and ISA buses, Timer/Counter logic, APIC, and NMI control logic. • Ultra I/O controller, containing the following: • serial / parallel communications ports • flexible drive controller (FDC) • real time clock (RTC) and CMOS memory • keyboard and mouse controller • serial EEPROM • Little BEN • audio controller • System ROM • other ISA accessory devices. ULTRA I/O CONTROLLER Serial / parallel communications ports The Ultra I/O chip (SMC 37C932) supports two serial ports and one bidirectional multi-mode parallel port. The two 9-pin serial ports (on the rear panel) support RS-232-C and are buffered by 16550 UARTs, with 16 Byte FIFOs. They can be programmed as COM1, COM2, COM3, COM4, or disabled. The 25-pin parallel port (also on the rear panel) is Centronics compatible, supporting IEEE 1284. It can be programmed as LPT1, LPT2, or disabled. 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 flexible drive controller (FDC) 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. It

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Plug and Play
Plug and Play is an industry standard for automatically configuring the PC’s hardware. When you
start the PC, the Plug and Play system BIOS can detect automatically which hardware resources
(IRQs, DMAs, memory ranges, and I/O addresses) are used by the system-based components.
The
HP Vectra XU/VT 6/xxx PC
s have a “PnP level 1.0A” BIOS and meets the “Windows 95
Required” level for Plug and Play. Accessory boards which are Plug and Play are automatically
configured by the BIOS (Windows 3.11) or by the operating system (Windows 95).
Error Diagnostics and Suggested Corrective Actions
Most problems caused by incompatibilities on PCI accessory boards are detected by the POST
during the Power-On sequence. This is described in Chapter 5.
DEVICES ON THE ISA BUS
The PCI/ISA bridge chip (otherwise known as the system I/O chip, SIO-A) is an Intel S82379AB. It
is responsible for transferring data between the PCI bus and the ISA expansion bus. It also houses
the controller for the ISA bus, and incorporates the logic for a DMA interface, a DMA controller
that supports fast DMA transfers, data buffers to isolate the PCI and ISA buses, Timer/Counter
logic, APIC, and NMI control logic.
•
Ultra I/O controller, containing the following:
•
serial / parallel communications ports
•
flexible drive controller (FDC)
•
real time clock (RTC) and CMOS memory
•
keyboard and mouse controller
•
serial EEPROM
•
Little BEN
•
audio controller
•
System ROM
•
other ISA accessory devices.
ULTRA I/O CONTROLLER
Serial / parallel communications ports
The Ultra I/O chip (SMC 37C932) supports two serial ports and one bidirectional multi-mode
parallel port. The two 9-pin serial ports (on the rear panel) support RS-232-C and are buffered by
16550 UARTs, with 16 Byte FIFOs. They can be programmed as COM1, COM2, COM3, COM4, or
disabled.
The 25-pin parallel port (also on the rear panel) is Centronics compatible, supporting IEEE 1284. It
can be programmed as LPT1, LPT2, or disabled. 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 flexible drive controller (FDC) 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. It