Intel 281786-002 manual IDE Support, National Semiconductor 87306 Super I/O Controller

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IDE SUPPORT

The Advanced/ZP baseboard provides two independent high performance bus-mastering PCI IDE interfaces capable of supporting PIO Mode 3 and Mode 4 devices for up to 16 MB/sec transfers. Support for ATAPI devices is provided in the system BIOS. The system BIOS also supports Logical Block Addressing (LBA) and ECHS on both IDE interfaces. When used in conjunction with a special driver the IDE interface operates as a PCI bus master for optimum performance in a multi-tasking environment. One such driver is provided by Intel for the Windows 95 environment.

NATIONAL SEMICONDUCTOR 87306 SUPER I/O CONTROLLER

Control for the integrated serial ports, parallel port, floppy drive, RTC and keyboard controller is incorporated into a single component, the National Semiconductor 87306. This component provides:

∙Two NS16C550-compatible UARTs with send/receive 16 byte FIFO

-Support for an IrDA compliant Infra Red interface ∙Multi-mode bi-directional parallel port

-Standard mode; IBM and Centronics compatible

-Enhanced Parallel Port (EPP) with BIOS/Driver support

-High Speed mode; Enhanced Capabilities Port (ECP) compatible

∙Industry standard floppy controller with 16 byte data FIFO (2.88 MB floppy support) ∙Integrated Real Time Clock accurate within +/- 13 minutes/yr

∙Integrated 8042 compatible keyboard controller

Configuration of these interfaces is possible via the CMOS Setup program that can be invoked during boot-up. The serial ports can be enabled as COM1, COM2 or disabled. COM2 can alternately be configured as an IRDA port. The parallel port can be configured as normal, extended , or disabled. The floppy interface can be configured for 720 KB, 1.2 MB, 1.44 MB, or 2.88 MB media. Header pins located near the back of the board allow cabling to use these interfaces.

KEYBOARD INTERFACE

The AT keyboard connector is located on the back panel side of the baseboard. The 5V lines to this connector is protected with a PolySwitch* circuit which acts much like a self-healing fuse, re-establishing the connection after an over-current condition is removed. While this device eliminates the possibility of having to replace a fuse, care should be taken to turn off the system power before installing or removing a keyboard.

The integrated 8042 microcontroller contains the AMI Megakey keyboard controller code which, besides providing traditional keyboard control functions, supports Power-On/Reset (POR) password protection. The POR password can be defined by the user via the Setup program. The keyboard controller also provides for the following "hot key" sequences:

∙CTRL-ALT-DEL: System software reset. This sequence performs a software reset of the system by jumping to the beginning of the BIOS code and running the POST operation.

∙CTRL-ALT+ and CTRL-ALT-: Turbo mode selection. CTRL-ALT- sets the system for de-turbo mode, emulating a 25 MHz AT, and CTRL-ALT+ sets the system for turbo mode. Changing the Turbo mode may be prohibited by an operating system, or when the CPU is in Protected mode or virtual 86 mode under DOS.

∙CTRL-ALT-<defined in setup>: Power down and coffee-break key sequences take advantage of the SMM features of the Pentium processor to greatly reduce the system’s power consumption while maintaining the responsiveness necessary to service external interrupts.

REAL TIME CLOCK, CMOS RAM AND BATTERY

The integrated Real Time Clock, RTC, is accurate to within 13 minutes/year. The RTC can be set via the BIOS SETUP Program. CMOS memory supports the standard 128-byte battery-backed RAM, fourteen bytes for clock and control registers, and 114 bytes of general purpose non-volatile CMOS RAM. All CMOS RAM is reserved for BIOS use. The CMOS RAM can be set to specific values or cleared to the system default values using the BIOS SETUP program. Also,

Advanced/ZP Technical Product Summary ∙Page 8

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Contents Advanced/ZP Baby-AT Board Table of Contents Introduction ADVANCED/ZP Form FactorBaseboard Dimensions Mounting Hole PlacementFront Panel Connectors JUMPERS/SWITCHESBoard Level Features Performance UpgradeCPU Second Level CacheSystem Memory EDO DramExpansion Slots PCI 3.3 Volt CapabilitiesPeripheral Component Interconnect PCI Pciset 82437FX Triton System Controller TSC82438FX Triton Data Path TDP 82371FB PCI ISA/IDE Accelerator PiixReal Time CLOCK, Cmos RAM and Battery IDE SupportNational Semiconductor 87306 Super I/O Controller Keyboard InterfaceSystem Bios Bios UpgradesIrda Infrared Support Flash ImplementationSetup Utility PCI AUTO-CONFIGURATIONPower Management ISA Plug & PlaySecurity Features ConnectorsConnections Power ConsumptionBack Panel Connections Current WattsSimm 1,2 Bank Simm 3,4 Bank Total System Memory Appendix a − User-Installable UpgradesRTC Battery Appendix B − Jumpers and Switches Recovery Boot Enable J1K1 Processor Voltage Regulation SwitchISA BUS Speed Switch PCI Configuration Space MAP Appendix D − Memory Map Appendix E − Interrupts & DMA ChannelsFront Panel Connectors − J2A1, J1B1 Appendix F − ConnectorsPower Supply Connectors Primary Power J9J1 AT Keyboard Connector J8k1 FLoppy Connector j9c1Serial Ports j7k1, j7k2 Parallel Port j9e1ISA Connectors J1G1, J2G1, J2G2, J3G1 PCI Connectors J4G1, J5G1, J5G2 Appendix G − Bios Setup Overview of the Setup Menu ScreensOverview of the Setup Keys Main ScreenHard Disk Configuration Submenu Floppy Options SubmenuInitialization Timeout IDE Translation ModeMultiple Sector Setting Number of CylindersBoot Options Submenu Peripheral Configuration Submenu Advanced ScreenSerial Port 2 IR Mode Parallel Port ModePCI IDE Interface Floppy InterfaceAdvanced Chipset Configuration Submenu Power Management ConfigurationPlug and Play Configuration Submenu Security Screen Options Administrative and User Access ModesSecurity Screen Exit Screen Recovery Mode Appendix H − Bios RecoveryUsing the Upgrade Utility Beep Codes Appendix I − Error messages and Beep CodesError Messages Plug and Play Error Messages ISA NMI MessagesAppendix J − Environmental Standards Appendix K − Reliability Data

281786-002 specifications

The Intel 281786-002 is a highly regarded microprocessor that was part of Intel’s extensive portfolio of technology solutions. Originally released in the mid-1990s, it is recognized for its robust performance and advanced features, which catered to the needs of both personal computing and embedded systems.

One of the standout features of the Intel 281786-002 is its architecture, which includes a 32-bit data bus. This architecture allows for efficient data processing and memory management. The processor is built on a 0.6-micron process technology, contributing to reduced power consumption while enhancing overall performance. The chip operates at various clock speeds, typically ranging around 25MHz to 50MHz, allowing it to suit different applications and user requirements.

The Intel 281786-002 also boasts a sophisticated instruction set that supports a wide range of operations. This multi-functionality ensures that it can efficiently handle complex computations and multitasking scenarios. Its ability to execute instructions in parallel paves the way for better performance when running multiple applications simultaneously.

In terms of memory support, the processor is designed to interface effectively with both SRAM and DRAM technologies, accommodating a vast range of memory configurations, thereby enhancing flexibility for system designers. It is also compatible with both 16-bit and 32-bit data buses, making it versatile enough for use in various computing environments.

Another notable aspect of the Intel 281786-002 is its integrated security features. These allow for better data protection and integrity, making it a viable choice for systems requiring enhanced security protocols.

Furthermore, the microprocessor's reliability and stability have made it a preferred choice for embedded applications, network devices, and industrial systems. Its proven track record in various computing environments underscores Intel's commitment to quality and performance.

Additionally, the Intel 281786-002 supports various operating systems, providing flexibility in deployment across different computing platforms. This compatibility ensures that users can leverage existing software ecosystems without extensive modifications.

In conclusion, the Intel 281786-002 microprocessor encapsulates an amalgamation of performance, efficiency, and versatility. With its advanced features and robust architecture, it has played a significant role in shaping computing technology, making it a noteworthy component in Intel’s legacy of innovation.
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