KEYBOARD REVERSE (ZX81)
by Derek Robinson, Bradford, West Yorkshire
from Your Computer (March 1982), Pages 72-73

This program effectively reverses the keyboard thus enabling Inkey$ to
operate on the graphic symbols so that they can be printed rapidly in a
continuous manner without resort to the shift key. With my software,
printing graphics can be controlled by a program, or by the cursor keys.
This makes unlimited picture drawing possible. The symbols can be changed
directly by pressing the key bearing the symbol required. Alternatively,
they can be interchanged with the normal Inkey$ character, or erased by a
flashing screen cursor, again, repeatedly and without limit.

To run the second program  N may be larger or smaller than 10  input
pairs of code numbers to correspond to the two symbols on the selected
keys. Enter the graphics-symbols code first and having input N pairs, the
screen will clear. Depress the symbol you require and it will appear on the
screen. You can print it repeatedly leaving a trail of the symbol in the
direction selected by the cursor including, 4, 9, T and U  45 degree
movement.

To change to another graphic symbol, press M followed by the symbol key. To
erase, press Rubout then a movement cursor; to change to the normal
character key or vice versa, press the full stop.
