Sun Microsystems SPARCstation 20 User Manual

viii SPARCstation 20 Service Manual • July 1996
Installing a NVRAM/TOD 181
12. Illustrated Parts Breakdown 183
Replacement Parts List 183
Illustration of Selected FRUs 185
A. Product Specifications 191
Physical Specifications 191
Electrical Specifications 192
Environmental Specifications 194
B. Functional Description 195
System Overview 195
System Architecture 195
System Board 196
SBus Card 197
MBus Module 198
MBus-to-SBus Interface 198
Memory 198
SBus-to-SCSI, Ethernet, and Parallel Interfaces 202
SBus-to-External Bus Interface 203
Clock Chip 204
C. System Board Connector Pinouts 205
Parallel Connector 205
AUI Connector 207
Keyboard and Mouse Connector 209
Serial Ports A and B Connector 210
Twisted-Pair Ethernet Connector 211
SCSI Connector 212

Sun Microsystems SPARCstation 20 Specifications

General

Brand	Sun Microsystems
Model	SPARCstation 20
Category	Desktop
Language	English