Omron 8025G Maintenance Manual page 66

THEORY OF OPERATION
SECTION 4
Hence, the character generator must be addressed nine times to complete a character.
A three-bit octal code is used for line addressing (000 through Ill), which provides
eight lines. The ninth line is obtained by incrementing the eighth-line address back
to the first line (000).
As shown in Figure 4-2, dot formation (C-3 through C-9) for producing the
"H" is contained in the character generator for the first seven lines (L-O through
L-6, address 000 through 110). No dot information is contained in the eighth line
(L-7, address Ill), and no dots ever exist in
c-o
through C-2. Incrementing L-7
back to L-O makes the ninth line (L-8) dot information identical to L-O. For this
group of characters, however, L-8 dot information is blanked out and does not appear
on the
CRT
screen.
COLUMN
LINE
o
2
3 4 5 6 7 8 9
ADDRESS CHARACTER I NFORMAT I ON
LI~E
oooe oooooe
000
oooeoooooe
001
2
oooeoooooe
010
3
oooeeeeeee
011
4
0 ooe oooooe
100
.
.
5
OOO_oooooe
101
6
OOO_oooooe
110
7
0000000000.
III
8
0000000000
000
9
0000000000
e ·
illuminated dot
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No (Increment to 000)
Yes, same as l-O but
blanked
Figure 4-2. Example of upper case character (H).
4-18