Example Of An Uppercase D (24-Line By 80-Column Font) - Digital Equipment VT520 Programming Manual

Character Sets
7.6 Soft Character Sets
Use the format shown in Figure 7–3. Each 6-bit pattern represents 6 pixels,
or a sixel. The least significant bit is at the top, and the most significant bit
is at the bottom. The terminal would receive the sixel columns in order (1 to
10), starting with Group A.
Figure 7–3 Example of an Uppercase D (24-Line by 80-Column Font)
Because the character cell height (16 pixels) is not a multiple of 6, the
columns on the bottom of the character cell (Group D) have only 4 bits each,
b0 through b3. Bits b4 and b5 in the bottom cell do not affect the character's
appearance, so they have been excluded from Figure 7–3.
3. Convert the binary value of each sixel to its hexadecimal value.
Sixels codes are restricted to characters in the range of ? (3F
so you must add an offset of 3F
For example:
000000
7–10 Character Sets
1 2 3 4 5
b0
b1
b2
b3
b4
b5
b0
b1
b2
b3
b4
b5
b0
b1
b2
b3
= 00 110101
2 16
+ 3F
16
3F
16
6 7 8 9 10
G r o u p A
G r o u p B
G r o u p C
G S F _ 0 6 0 0 _ 8 9 . D G
to the hexadecimal value of each column.
16
= 35 111111
2 16
+ 3F
16
74
16
) to ~ (7E ),
16 16
= 3F
2 16
+ 3F
16
7E
16