HP 9800 SERIES - Page 5

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Chapter 4: Status Display Board Diagnosis
Introduction ........................................................................ 4-1
General Description of Diagnosis Method
.............................................. 4-1
Self-Test Initiation
................................................................... 4-2
T est Selection
....................................................................... 4-2
Default Self-Test
................................................................ 4-2
Read-Only Self-Test
............................................................. 4-2
Write/Read Self-Test ............................................................ 4-2
Using the Status Display Board for Failure Analysis ..................................... 4-4
Obtaining Test Results From LED Display ............................................. 4-4
Error Rate Testing With the Status Display Board ...................................... 4-6
Chapter 5: Replaceable Parts
Introduction ........................................................................ 5-1
Appendix A: HP 9895A Disc Memory Command Set
Introduction ............................. ~ .......................................... A-I
Command Compatibility ............................................................. A-2
Command Sequences ............................................................... A-2
Parallel Poll Response
............................................................... A-3
Cylinder
and Track Numbering ....................................................... A-3
Target Addressing
................................................................... A-4
The D Bit
........................................................................... A-4
HP and IBM Formats ................................................................ A-5
Loading of
the Recording Heads ..................................................... A-5
Holdoffs
........................................................................... A-6
Command Execution Checks ......................................................... A-8
Commands ......................................................................... A-9
Sense
Commands ................................................................. A-II
Identify ........................................................................ A-II
DSJ ............................................................................ A-II
Read Self-Test Results .......................................................... A-I3
Read Loopback Record ......................................................... A-I4
Request Status ................................................................. A-I5
Request (Logical) Disc Address .................................................. A-20
Request (Physical) Disc Address ................................................. A-2I