Proportional and Fixed Spacing
Proportional and Fixed Spacing

Proportional and Fixed Spacing

Proportional spacing is different than fixed spacing. In Table 1, the intercharacter gap (ICG), the space between characters, is constant for fonts A through H, which means that the spacing between all characters is the same. For example, the spacing between the letters
MW
is the same as between the letters
IE
.
Fixed Space Fonts Proportion Example
The baseline is the imaginary line on which the bottom (base) of all characters (except any descenders) rest. The area between the baseline and the bottom of the matrix is used for any character “descenders.” Baseline numbers define where the baseline is located in relationship to the top of the matrix. For example, the baseline for font “E” is 23 dots down from the top of the matrix.
Intercharacter Gap and Baseline Parameters
Font
H x W (in dots)
Type
Intercharacter Gap (in dots)
Baseline(in dots)
A
9 x 5
U-L-D
1
7
B
11 x 7
U
2
11
C,D
18 x 10
U-L-D
2
14
E
28 x 15
OCR-B
5
23
F
26 x 13
U-L-D
3
21
G
60 x 40
U-L-D
8
48
H
21 x 13
OCR-A
6
21
GS
24 x 24
SYMBOL
PROPORTIONAL
3 x HEIGHT/4
0
DEFAULT: 15 x 12
PROPORTIONAL
3 x HEIGHT/4