Commodore 128 Programmer's Reference Manual page 244

234 COMMODORE 128
SCREEN LOCATION
The screen location in multi-color character mode defaults to 1024 ($0400) through 2023
($07E7), the same as standard character mode. The screen memory locations can be
relocated. See the Screen Memory section for details.
HOW SCREEN DATA IS INTERPRETED
In multi-color character mode, the screen data from screen memory is interpreted as
screen codes the same way as in standard character mode. The screen codes are listed in
Appendix D. See the screen data interpretation in the standard character memory
section. The only difference between standard character mode and multi-color character
mode is the way color is assigned to the characters on the screen.
CHARACTER MEMORY LOCATION
The character memory in multi-color character mode, as in standard character mode, is
taken from between 53248 ($D000) and 57343 ($DFF) when I/O is switched out. See
standard character mode for more detailed information on character memory.
HOW CHARACTER MEMORY IS INTERPRETED
IN MULTI-COLOR CHARACTER MODE
Character memory is interpreted virtually the same way in multi-color and in
standard character modes, except for one difference: In standard character mode, if
a bit in the character definition image is on, the pixel corresponding to that bit
is colored in the foreground color as specified by color RAM. If a bit in the character
image in the character ROM is equal to zero, the corresponding pixel on the screen is
colored in the background color, as specified by background color register 0 (loca
tion 53281).
In multi-color character mode, color assignments to the pixels that make up the
character on the screen are not in a direct one-to-one relationship to the bits in the
character ROM data patterns. Instead, the bits that make up a character are grouped in
pairs, as shown in figures 8-18, 8-19 and 8-20.
D
U
U
U
Figure 8-18. "At" Sign (@) Character as It Appears on the Screen
u
u