Commodore VIC-20 - Page 237

Chapter 6: Graphics 223
VIC Chip
Window Location
0
'1024
2048
3072
4096
5120
6144
7168
8192
9216
10240
11264
12288
13312
14336
15360
PEEK and POKE Locations
32768
33792
34816
35840
36864
37888
38912
39936
0
1024
2048
3072
4096
5120
6144
7168
Screen and
Character Memory
Unreversed
Character ROM
Reversed
Character ROM
Unreversed Upper and
I,.ower Case ROM
Reversed Upper and
Lower Case ROM
VIC Chip and
VIA Chips
Color Memory
Reserved for
Expansion
Reserved for
Expansion
System Memory
Not present in
Standard VIC
Filled by
3K
Expansion Cartridges
Program and
Screen Memory
FIGURE 6·7. The VIC chip's window into memory
Color
Memory
37888
37888
37888
37888
37888
37888
37888
37888
37888
37888
37888
37888
37888
37888
37888
37888
example, at 4096 in a "big" VIC), the lower half (37888-32893) is used.
Otherwise, the upper half (38400-38905) holds the color information.
Changing the Locallon of Screen
And Character Memory
Screen and character memory can be placed anywhere in the VIC chip's
window. The starting locations are kept in the chip and may be changed with