TABLE OF CONTENTS 11.8 Speaker control 11-41 11.9 Disk drive control 11-41 11.10 Expansion RAM control 11-46 11.11 Serial port control 11-50 11.13 Joystick and paddle control 11-54 11.12 Parallel printer control 11-52 11-14 Mouse control 11 -56 11-15 Power supply 11 -59 APPENDIX A. CPU speed control in "LASER 128 EX" A-l B. Keyboard layouts and key codes B-l C. 65C02 programming specification C-l D. Service information D-l D.l Trouble shoot guide D-l D.2 Gate array pin assignment D-21 D.2.1 Gate array 1 : MMU D-21 D.2.2 Gate array 2 : VDG D-37 D.2.3 Gate array 3 : UDC D-53 VI