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Assigning the character dot pattern
We will use a tiny representation of a telephone symbol for our example.
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~
I I ~~ ~ ~I
I I I I I I I I I I i I
I I I I I I I
~
I
64—— —
a, I- I I-I I- I l-r l-r I-
I- I- 1 1 I
32—— —
~ !
16———
8—— —
4
2 ———
1
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04
32
16
6
4
2
1
128
64
32
16
8
4
2
1
ii
●
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figure 9-3.Telephone symbol with LQ pica
After you have designedthe character pattern, you will need to compress the
DotPattern. Data compression allowsyouto storemoredownload characters
than without compression. It is a more efficient use of memory. The printer
will repeat the previous dot column when the current column compression
mask bit is set to “l”.
Fill up theadjacent dot even they do notprint, then compare theeach veritcal
line to the left line. If the line is the same as the left one, write “l” in the
column of the “compression mask bit”. If it is different, write “O”.
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