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If you use hexadecimal numbers to specify dots or combination of dots, you must think of the Columns as being
arranged as in Table 9:
GPR
INT Addressable Dot Numbering (Hexadecimal)
Column
Row
1
2
4
8
1
2
4
*
*
*
*
*
*
*
Table 9
In this arrangement, the seven rows are divided into a lower group of three rows and an upper group of four rows.
Each group is numbered, from top to bottom, by powers of two.
It is therefore possible to represent all the patterns of a group by a single hexadecimal number. Because the lower
group has only three rows, the range of allowable digits for this group will be from 0-7.
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