Lenovo ThinkPad 600E Technical Reference Manual for the ThinkPad 600 - Page 13

System Board Devices and Features, IBM Personal System/2 Hardware Interface Technical Reference - ram

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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. Device Microprocessor External cache System timers ROM subsystem RAM subsystem CMOS RAM subsystem EEPROM subsystem Video subsystem Type - - 1 - - - - Features Intel Pentium processor with the MMX technology 233 MHz or Intel Pentium II processor 233 or 266 MHz 512 KB (write back) Channel 0: system timer Channel 1: refresh generation Channel 2: tone generator for speaker 128 KB by 4 banks (1 KB equals 1024 bytes) 32 to 160 MB (1 MB equals 1,048,576 bytes) 128 bytes CMOS RAM with real-time clock/calendar + 4 KB NVRAM 1 K bits - XGA video functions: Up to 65,536 colors on the TFT XGA (1024x768) LCD and HPA XGA (1024 x 768). Up to 16,777,216 colors on an external monitor DMA controller See "Video Subsystem" on page 3-2 for more details on the video subsystem. 1 Seven DMA channels (AT compatible:) Four 8-bit channels and three 16-bit channels Figure 1-2 (Part 1 of 2). System Board Devices and Features System Overview 1-3

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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
233 MHz
or
Intel Pentium II
processor
233 or 266 MHz
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 160 MB (1 MB equals 1,048,576 bytes)
CMOS RAM
subsystem
–
128 bytes CMOS RAM with real-time
clock/calendar
+
4 KB NVRAM
EEPROM
subsystem
–
1 K bits
Video subsystem
–
XGA video functions:
Up to 65,536 colors on the TFT XGA
(1024x768) LCD and HPA XGA (1024 x
768).
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