Zenith Z-100 PC series Service Manual page 240

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Contents
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Chapter 4 Troubleshooting
General ....................................................... 4.1
Serial Input/Output .............................................. 4.2
Floppy Disk Controller ........................................... 4.4
Troubleshooting Table ........................................... 4.8
Video Output Adjustments ....................................... 4.9
Chapter 5 Parts List
Introduction .................................................... 5.1
Parts List ..................................................... 5.2
Tables
2.1 Interrupt Vector Selection ................................... 2.2
2.2 Monitor Synchronization and Light Pen Configuration ............ 2.2
2.3 DIP Switch Options ....................................... 2.3
3.1 Video Logic-to-System Logic Interlace Signals ................. 3.9
3.2 CRT Controller Register Functions .......................... 3.11
3.3 Video I/O Port Assignments ............................... 3.16
3.4 Video I/O Port Selection .................................. 3.16
3.5 Color Select Register Logic ................................ 3.17
3.6 Color Palette Number 1 Selection .......................... 3.18
3.7 Color Palette Number 2 Selection .......................... 3.18
3.8 Mode Select Port 3D8 Logic ............................... 3.19
3.9 Mode Select Port 3DA Logic ............................... 3.20
3.10 Status Select Logic ....................................... 3.21
3.11 Gate Array I/O Signal Description and Pinouts ................ 3.28
3.12 Software Selectable Color Palettes .......................... 3.32
3.13 PAL Logic Equations ..................................... 3.36
3.14 Logic Designators ........................................ 3.36
3.15 PAL I/O Signal Description and Pinout ...................... -3.37
3.16 Backplane I/O Bus Signal Names .......... _................ 3.38
4.1 Serial I/O Component Failures ..... _........................ 4.3
4.2 Floppy Disk Controller Component Failures .................... 4.7
4.3 General Troubleshooting Guide ....................... _...... 4.8
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