MYSTERY PROGRAMS (1K ZX81)
by Allister Dann, Sleaford, Lincolnshire
from Your Computer (November 1982), Page 111

These programs are for the 1K ZX-81 alone. Tempting as they might seem to
16K owners, the RAM pack must be removed.

Program 1: When the inverse L appears, enter 62,-166,237,71,201 where the
commas represent NEWLINE.

You will have to try it to see what this program does, because it is very
hard to describe. Suffice to say it produces graphics never before seen on
a ZX-81.

Program 2: The screen is filled with peculiar characters. Wait until
three-quarters of the screen is filled, and then Wham!

To revert to the normal graphics mode, use NEW. Repeat this procedure,
changing the -166 to -122 for even more spectacular results.

The cleverer ones amongst you will have realised that program 1 can be
entered as a series of direct POKE commands. The format I have used is
simply the one I like best. For fun, trying changing the -122 to another
number.

Program 3 was discovered by accident. The POKE command gives you 34 columns
as opposed to the standard 32. Use line 10 with other programs to increase
screen size.
