Radio Shack PC-2 TRS-80 Owner's Manual page 72

If you use decimal numbers, you must specify the dots in terms of the rows they occupy as described in Table 8.
GPRINT Addressable Dot Numbering (Decimal)
Column
Row 1
2
4
8
16
32
64
*
*
*
- - - - - - - - - - * - - - - - - - - - - - - - - - - -
- - - - - - - - - - * - - - - - - - - - - - - - - - - -
*
*
Table 8
To turn on the Row 16 dot in a column (column 100, for instance), simply type (in RUN Mode):
68