Commodore Plus 4 - Page 237

Summary of Memory Map Considerations 235
$FF12 Bit 2 determines RAM (0) or ROM (1).
$FF13 Bits 7-2 determine location of character set (bits 15-10).
$FF14 Bits 7-3 determine location of color/screen memory (bits 15-11).
$FF15 Background 0 luminance and color.
$FF16 Background 1 luminance and color.
$FF17 Background 2 luminance and color.
$FF18 Background 3 luminance and color.
$FF19 Border luminance and color.
Character color and luminance are determined by color memory (normally
$0800-$0BE7). Characters displayed and their background color are determined
by screen memory (normally $0C00-$0FE7).
Multicolor Characters
SFF07 Set bit 4 for multicolor mode. Bit 7 determines 128 characters (0)
or 256 characters (1).
$FF12 Bit 2 determines RAM (0) or ROM (1).
$FF13 Bits 7-2 determine location of character set (bits 15-10).
$FF14 Bits 7-3 determine location of color/screen memory (bits 15-11).
$FF15 Background 0 luminance and color.
$FF16 Background 1 luminance and color.
$FF17 Background 2 luminance and color.
$FF19 Border luminance and color.
Character color, luminance, and high-resolution or multicolor status are deter
mined by color memory (normally $0800-$0BE7). Characters displayed are
determined by screen memory (normally $0C00-$0FE7).
High-Resolution Bit Map
$FF06
$FF12
Set bit 5 for bit-map mode.
Bit 2 determines RAM (0) or ROM (1). Bits 5-3 determine loca
tion of bit map (bits 15-13).