Radio Shack PC-2 TRS-80 Owner's Manual page 78

To create a box (like the one that was used in the previous example) but with hexadecimal numbers, type (in the
RUN Mode):
and the box will be created.
If you specify a single-digit Hex number, it must be preceded by a zero (e.g., OA is legal; A is illegal).
Another way to accomplish the same thing is to use the hexadecimal preface &. For instance:
and the box will again be created.
Example
To create an up-arrow using GPR I NT, type:
1
(1
=
~l~
AI T 25
74