TallyGenicom Matrix Printer Programmer's Manual page 168

Just add up the values of the three parts of the byte to get the value of A.
1. Normal
Descender
2. First column is 1
First column is 2
First column is 3
First column is 4
First column is 5
First column is 6
First column is 7
First column is 8
3. Last column is 5
Last column is 6
Last column is 7
Last column is 8
Last column is 9
Last column is 10
Last column is 11
Last column is 12
Example:
Descender matrix field
First column is 3
Last column is 10
Total value of <A>
= 128
= 0
= 0
= 16
= 32
= 48
= 64
= 80
= 96
= 112
= 4
= 5
= 6
= 7
= 8
= 9
= 10
= 11
= 0
= 32
= 9
= 41
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