Commodore Amiga - Page 11

Chapter 7 SYSTEM CONTROL HARDWARE ............................................... 197
Introduction ............................................................................................................................. 197
Video Priorities ..................................................................................................................... 198
FIXED SPRITE PRIORITIES
.................................................................................... 198
HOW SPRITES ARE GROUPED
............................................................................ 199
UNDERSTANDING VIDEO PRIORITIES
.......................................................... , 199
SETTING THE PRIORITY CONTROL REGISTER
...................................... 200
Collision Detection ............................................................................................................. 202
HOW COLLISIONS ARE DETERMINED
........................................................... 202
HOW TO INTERPRET THE COLLISION DATA
........................................... 202
HOW COLLISION DETECTION
IS CONTROLLED ..................................... 203
Beam Position Detection ............................................................................................... 205
USING THE BEAM POSITION COUNTER
...................................................... 205
Interrupts .................................................................................................................................. 207
NONMASI<ABLE INTERRUPT
............................................................................... 207
MASKABLE INTERRUPTS
....................................................................................... 207
USER INTERFACE TO THE INTERRUPT SYSTEM
.................................. 207
INTERRUPT CONTROL REGISTERS
................................................................ 208
SETTING AND CLEARING BITS
.......................................................................... 208
DMA Control ......................................................................................................................... 212
Chapter 8 INTERFACE HARDWARE .................................................................... 215
Introduction ............................................................................................................................. 215
Controller Port Interface .............................................................................................. 216
READING THE CONTROLLER
PORT ............................................................... 217
Disk Controller ..................................................................................................................... 227
DISK SELECTION, CONTROL, AND SENSING
............................................ 228
OTHER REGISTERS IN DISK OPERATIONS
............................... :................. 232
DISI( INTERRUPTS
...................................................................................................... 235
The I(eyboard ........................................................................................................................ 236
HOW THE KEYBOARD DATA
IS RECEIVED ................................................ 236
TYPE OF DATA RECEIVED .................................................................................... 236
LIMITATIONS
OF THE KEYBOARD .................................................................. 239
Parallel Input/Output Interface ............................................................................. 240
Serial Interface ...................................................................................................................... 240
INTRODUCTION
TO SERIAL CIRCUITRy..................................................... 240
SETTING THE
BAUD RATE .................................................................................... 240
SETTING THE RECEIVE MODE
........................................................................... 241
CONTENTS
OF THE RECEIVE DATA REGISTER ..................................... 241
HOW OUTPUT DATA
IS TRANSMITTED ....................................................... 243
SPECIFYING THE REGISTER CONTENTS
.................................................... 244
Audio Output Connections ......................................................................................... 245
Display Output Connections ...................................................................................... 245
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