Commodore Amiga - Page 319

mode, 30
memory required, 41,
69
modulo registers, 51
multiple-playfield display, 82
normal, 30
poin ter registers, 57,
67
priority, 200
register summary, 83-5
scrolling
horizon tal, 74-8
vertical, 73-4
selecting bit-planes,
37
setting resolution mode, 38
specifying modulo, 50-2, 66-8
specifying the data fetch, 67
with external video source, 82
with genlock, 82
with larger display memory, 66-8
Playfield-sprite priority, 200
Ports
controller, 216
disk, 228
parallel, 240
serial, 240-5
POTODAT,
223
POT1DAT, 223
POTGO, 222, 226-7
POTGOR, 226-7
Priority
dual playfields,
64
playfield-sprite, 200
priority control register,
200
sprites, 198
Proportional con trollers
reading,
222
Resolution
setting,
38
Sampling
period,
141
rate, 152
Scrolling
data fetch, 76
delay, 78
horizon tal, 74-8
Index-6
in dual-playfield mode,
64
in high-resolution mode, 75
modulo, 76
vertical, 73-4
SERDATR, 241-3
Serial port
baud rate, 240
output register, 243
receive-data register,
241
shift register, 243
SERPER,
241
Sound generation, 132-5
Sprites
address pointers, 106
arming and disarming, 120
attached
color registers,
129
colors, 118
control word, 116
Copper list, 119
data words, 117, 119
clipped, 95
collision, 109, 202-4
color,
96-8
color registers used, 98
comparator, 121, 123
control registers, 121, 123, 125-6
con trol words,
102
data registers, 123, 126
data structure, 99-104
data words, 102
designing, 98
displaying
example, 106-8
steps in, 104
DMA,
105, 110
end-of-data words, 104
forming,
92 .. 104
manual mode,
119
memory requirements, 100
moving, 108-10
overlapped, 114
parallel-to-serial converters,
120
pixels in sprites, 95