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Radio Shack PC-2 TRS-80 - Page 75

Radio Shack PC-2 TRS-80
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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.
71

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