PROCESSOR VOLTAGE REGULATION - SWITCH 2

Sets the output of the on-board voltage regulator. The switch settings are OFF = VR, and ON = VRE. The VR voltage specification requires a voltage range of 3.3-3.465 Volts DC, while the VRE specification requires a voltage range of 3.45- 3.6V. Pentium processors currently available that do not require the VRE voltage specification should use the VR setting. When upgrading your CPU be sure to consult the documentation for the processor voltage requirements before setting this switch, as an incorrect setting may damage the processor. The default position is with the switch set for VR (off).

ISA BUS SPEED - SWITCH 1

Sets the ISA bus speed to either 1/4 or 1/3 of the PCI bus speed to best maximize system performance for 75, 90, 100 or 120 MHz processor speeds. When SW1=ON the ISA bus speed will be 1/4 of the PCI bus speed and when SW1=OFF the ISA bus speed will be 1/3 the PCI bus speed. The ISA bus speed is derived from the PCI bus speed which is derived from the external processor clock frequency. The position of SW1 will set the ISA bus speed to either Compatible or Enhanced for 90 MHz, 100 MHz, and 120 MHz processors and will leave the ISA bus speed Compatible for 75 MHz processor speed. For 90 MHz, 100 MHz, and 120 MHz processor speeds, if SW1 is set to Compatible (SW1=ON), the speed will fall within the limits defined by the IBM AT Technical Reference (6-8.33 MHz). If set to Enhanced (SW1=OFF), the speed will be greater than the maximum defined by the IBM AT Technical Reference manual. SW1 can be set to either position when a 75 MHz processor speed is used for maximum ISA bus performance. Modern ISA cards can operate with the enhanced speeds, however some older cards can experience difficulties. The actual value of the Bus Clock when set to Compatible or Enhanced is dependent upon the setting of the external processor frequency. The following table describes the ISA bus speeds for the 75 MHz, 90 MHz, 100 MHz, and 120 MHz processor speeds.

Internal Processor Frequency

 

PCI bus Frequency

SW1=OFF (1/3)

SW1=ON (1/4)

75 MHz

 

25 MHz

8.33 MHz

8.33 MHz

90 MHz

 

30 MHz

10.0 MHz

7.50 MHz

100 MHz

 

33 MHz

11.0 MHz

8.33 MHz

120 MHz

 

30 MHz

10.0 MHz

7.50 MHz

 

Table B-2. ISA Bus Speed Switch Settings

 

RECOVERY BOOT ENABLE - J1K1

This switch allows the system to boot in the event the system BIOS has been corrupted by moving the jumper from the default position of 1-2 to the 2-3 position. A recovery disk must be in drive A while booting up with this jumper set to 2-3. Once the recovery is complete the jumper should be move back to pins 1-2, and the system rebooted.

Advanced/ZP Technical Product Summary ∙Page 16

Page 15 Page 17
Page 16
Image 16
Intel 281786-002 manual Processor Voltage Regulation Switch, ISA BUS Speed Switch, Recovery Boot Enable J1K1
Page 15 Page 17

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.
Top Page Image Contents