XX format => text/bitmap color/multicolor / extended background mode
$D020, 15 octets :
BO BORDER
BA BACKGROUND
E1 Extra background color #1
E2 Extra background color #2
E3 Extra background color #3
SE1 sprite extra color #1
SE2 sprite extra color #2
S0 sprite #0
S1 sprite #1
S2 sprite #2
S3 sprite #3
S4 sprite #4
S5 sprite #5
S6 sprite #6
S7 sprite #7
TP
T = type
0 - end of file
1 - bitmap
2 - screen ram
3 - color ram
4 - border/background etc.
P = packing
0 - no packing
1 - RLE packing
2 - color ram RLE packing
