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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 3). System Board Devices and Features
Device Type Features
Microprocessor – ThinkPad 560:
Intel** Pentium**
100/120/133MHz
16KB on-chip cache
ThinkPad 560E:
Intel Pentium processor with the MMX
technology
150/166MHz
32KB on-chip cache
Level 2 cache – ThinkPad 560:
None
ThinkPad 560E:
256KB
System timers 1 Channel 0: system timer
Channel 1: refresh generation
Channel 2: tone generator for speaker
ROM subsystem – 128KB by 4 banks (1KB equals 1024 bytes)
RAM subsystem – ThinkPad 560:
8 to 40MB (1MB equals 1048576 bytes)
ThinkPad 560E:
16MB (standard). Expandable up to 48MB
with the 32MB DIMM.
Expandable up to 80MB with the 2-bank-type
64MB DIMM.
CMOS RAM
subsystem
– 128 bytes CMOS RAM with real-time
clock/calendar
ThinkPad 560/560E System Overview 1-3