Cache Memory; Graphics Controllers; Ide Peripheral Interface - Compaq Deskpro 2000 Series Reference Manual

Cache Memory

Graphics Controllers

IDE Peripheral
Interface
1-4 Computer at a Glance
Cache memory is very fast pipeline burst memory used for
temporarily storing data for fast access by the processor. The
faster the processor is, the more need there is for temporary
data storage. A 256-kilobyte write-back, direct mapped
secondary (L2) cache is integrated on Pentium models that
have a speed of 120 megahertz or higher. A 256-kilobyte write-
back, four-way, set associative secondary (L2) cache is
integrated into the processor on Pentium Pro models.
The purpose of a graphics controller is to generate the text and
graphics images for the monitor screen. The quality of the
picture you see depends on the resolution of your monitor and
the number of colors that can be displayed. High resolution
graphics with many colors require that the graphics controller
has its own memory system. The computer comes with one of
the following graphics controllers:
The Matrox MGA Millennium graphics controller comes
standard with 2 megabytes of Windows random access
memory (WRAM), which can be upgraded to 4 or 8
megabytes of WRAM.
The Cirrus 5446 PCI performance graphics controller
comes standard with 1 megabyte of Extended Data Out
(EDO) dynamic random access memory (DRAM), and can
be upgraded to 2 megabytes of EDO DRAM.
The Cirrus 5436 PCI performance graphics controller
comes standard with 1 megabyte of EDO DRAM, and can
be upgraded to 2 megabytes of EDO DRAM.
The onboard PCI chipset provides a high-speed, 32-bit
PCI/IDE interface, which supports the following:
Up to four PCI/IDE hard drives on the PCI bus
Enhanced Mode 3 and Mode 4 support
Logical block addressing (LBA) of hard drives larger than
528 megabytes
Extended cylinder head sector (ECHS) translation modes
ATAPI devices (such as CD-ROMs) on both IDE interfaces