Sinclair QL Service Manual

4. SER OUTPUTS
5. HOW TO CURE A CRASHING QL
6. FLICKERING DISPLAYS
APPENDIX B TO SECTION 4 USER HINTS
APPENDIX C TO SECTION 4 MANDATORY MODIFICATIONS
1. FITMENT CHECKS
2. IMPROVEMENT TO MICRODRIVE PERFORMANCE
3. COLLAR FOR QL MICRODRIVE 2
APPENDIX D TO SECTION 4 MICRODRIVE FAULT FINDING
1. INTRODUCTION
2. MECHANICAL CHECKS
3. USING THE SIGNAL TEST PROGRAM
3.2 Write Check
3.3 Read Check
3.4 Erase Check
4. FAULTS ON EARLY MICRODRIVES
SECTION 5
PARTS LISTS
1. SERIAL NUMBERS
2. PARTS LISTS / MODIFICATION HISTORY
3. RETROSPECTIVE (MANDATORY) MODIFICATIONS
4. NOTES TO TABLES

Sinclair QL Specifications

General

Processor	Motorola 68008
Clock Speed	7.5 MHz
RAM	128 KB (expandable to 640 KB)
ROM	48 KB
Operating System	Sinclair QDOS
Release Year	1984
Storage	Microdrive tape loop
Graphics	256x256 pixels, 8 colors
Ports	RS-232, ROM cartridge
Sound	Beeper (internal speaker)