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System Board Devices and Features
Figure 1-2 lists the system board devices and their features. The
IBM Personal System/2 Hardware Interface Technical Reference
describes devices common to PS/2 products by type number.
Figure 1-2 (Part 1 of 2). System Board Devices and Features
Device Type Features
Microprocessor – Intel Pentium processor with the MMX
technology
200 or 233 MHz
32 KB on-chip cache
External cache – 512 KB (write back)
System timers 1 Channel 0: system timer
Channel 1: refresh generation
Channel 2: tone generator for speaker
ROM subsystem – 128 KB by 4 banks (1 KB equals 1024 bytes)
RAM subsystem – 32 to 256 MB (1 MB equals 1,048,576 bytes)
CMOS RAM
subsystem
– 128 bytes CMOS RAM with real-time
clock/calendar + 4 K byte NVRAM
EEPROM
subsystem
– 1 K bits
Video subsystem – XGA video functions:
Up to 65,536 colors on the TFT XGA
(1024x768) LCD
Up to 16,777,216 colors on an external
monitor
See “Video Subsystem” on page 3-2 for more
details on the video subsystem.
DMA controller 1 Seven DMA channels (AT compatible:)
Four 8-bit channels and three 16-bit channels
System Overview 1-3