Page 22
Epson Research and Development
Vancouver Design Center
8 bpp color
When the S1D13506 is configured for 8 bpp color mode all 256 entries in the LUT are used.
Each byte in the display buffer corresponds to one pixel and is used as an index value into
the LUT.
The S1D13506 LUT has four bits (16 intensities) of intensity control per primary color
while a standard VGA RAMDAC has six bits (64 intensities). This four to one difference
must be considered when attempting to match colors between a VGA RAMDAC and the
S1D13506 LUT. (i.e. VGA levels 0 - 3 map to LUT level 0, VGA levels 4 - 7 map to LUT
level 1...). Additionally, the significant bits of the color tables are located at different offsets
within their respective bytes. After calculating the equivalent intensity value the result must
be shifted into the correct bit positions.
The following table shows LUT values that will approximate the VGA default color palette.
Table 4-3: Suggested LUT Values to Simulate VGA Default 256 Color Palette
Index
R
G
B
Index
40
41
42
43
44
45
46
47
48
49
4A
4B
4C
4D
4E
4F
50
51
52
53
54
55
56
57
58
59
5A
5B
5C
5D
5E
R
G
B
Index
80
81
82
83
84
85
86
87
88
89
8A
8B
8C
8D
8E
8F
90
91
92
93
94
95
96
97
98
99
9A
9B
9C
9D
9E
R
G
B
Index
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9
CA
CB
CC
CD
CE
CF
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
DA
DB
DC
DD
DE
R
G
B
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
00
00
00
00
A0
A0
A0
A0
50
50
50
50
F0
F0
F0
F0
00
10
20
20
30
40
50
60
70
80
90
A0
B0
C0
E0
00
00
A0
A0
00
00
50
A0
50
50
F0
F0
50
50
F0
F0
00
10
20
20
30
40
50
60
70
80
90
A0
B0
C0
E0
00
A0
00
A0
00
A0
00
A0
50
F0
50
F0
50
F0
50
F0
00
10
20
20
30
40
50
60
70
80
90
A0
B0
C0
E0
F0
F0
F0
F0
F0
D0
B0
90
70
70
70
70
70
70
70
70
B0
C0
D0
E0
F0
F0
F0
F0
F0
F0
F0
F0
F0
E0
D0
70
90
B0
D0
F0
F0
F0
F0
F0
F0
F0
F0
F0
D0
B0
90
B0
B0
B0
B0
B0
B0
B0
B0
B0
C0
D0
E0
F0
F0
F0
70
70
70
70
70
70
70
70
70
90
B0
D0
F0
F0
F0
F0
F0
F0
F0
F0
F0
E0
D0
C0
B0
B0
B0
B0
B0
B0
B0
30
40
50
60
70
70
70
70
70
70
70
70
70
60
50
40
30
30
30
30
30
30
30
30
50
50
60
60
70
70
70
30
30
30
30
30
30
30
30
30
40
50
60
70
70
70
70
70
70
70
70
70
60
50
40
50
50
50
50
50
50
50
70
70
70
70
70
60
50
40
30
30
30
30
30
30
30
30
30
40
50
60
70
70
70
70
70
70
70
70
70
60
60
00
00
00
00
00
00
00
00
20
20
30
30
40
40
40
40
40
40
40
40
40
30
30
20
20
20
20
20
20
20
20
40
40
40
40
40
30
20
10
20
20
20
20
20
20
20
20
20
20
30
30
40
40
40
40
40
40
40
40
40
30
30
00
10
20
30
40
40
40
40
40
40
40
40
40
30
30
20
20
20
20
20
20
20
20
20
20
20
30
30
40
40
40
S1D13506
X25B-G-003-03
Programming Notes and Examples
Issue Date: 01/02/06
EPSON [ EPSON COMPANY ]
