HP Vectra VE 5/xxx HP Vectra VE 5/xx Series 2 PC Familiarization Guide - D4000 - Page 7
New Features, System Board, Microprocessor - 75
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• The desktop's backplane has one PCI slot, one combination ISA/PCI slot, one ISA slot and one HP proprietary ISA slot for accessory boards. New Features • A completely upgradable Pentium-based system board (using system board switches and voltage regulator module). • A new keyboard supporting Windows 95 special key functions. • Vectra Ergonomic Power Solution (VEPS): space bar power-on (under any operating system), push-button status panel, and software shutdown from Windows 95. • HP's new style BIOS. System Board The main features of the system board are: • A system board that can mount PENTIUM processors (with accompanying Voltage Regulation Module) at several different clock speeds (75 MHz, 100 MHz and 133 MHz). • A new type of main memory module called EDO (Extended Data Output) for faster memory access times (60 ns). • Optional 256KB of synchronous pipeline burst level 2 cache. • A 64-bit host bus for PENTIUM processor, cache and main memory. • A 32-bit Peripheral Component Interconnection (PCI) local bus for accessing the video controller and IDE controller. • An Industry-Standard Architecture (ISA) bus for ISA-compatible controllers (for devices such as flexible disk drives, serial ports, parallel port, and audio card in multimedia models). • A dual password (administrator and user) security system that provides protection against unauthorized use of the PC. • A flash BIOS updating facility. Microprocessor The Pentium microprocessors used in the HP Vectra VE 5/xx series 2 use internal clock multiplication, similar to that used by the 486 DX2 processor. The microprocessor's internal clock is a multiple of the system clock. The Pentium 75 MHz and 100 MHz processors multiply the 50 MHz and 66 MHz system clock by a factor of 1.5. The Pentium 133 MHz processor doubles the 66 MHz system clock. The Pentium 150 MHz processor multiplies the 60 MHz system clock by a factor of 2.5. To set the appropriate switches for each processor speed, refer to the Pentium Processor table in the section System Board Switches in chapter 2. The system board of the HP Vectra VE 5/xx series 2 has a Voltage Regulator Module (VRM) which supplies the Pentium processor with the correct voltage. The VRM allows the processor to be upgraded without replacing the system board.