SPEED SCROLL (16K ZX81)
by Munir Zaman, Levenshulme, Manchester
from Your Computer (January 1983), Page 119

This program performs the SCROLL function at speed without disrupting the
display file. ZX-81 users will notice that clearing the screen after a
SCROLL function takes a long time if the program is long; also printing
takes a long time after a SCROLL function.

This program does not have these disadvantages, and it only requires 15
bytes compared to Per Nielsen's program although it does not have the
special features. The program can be stored anywhere. If in line 1 - REM -
the program can be called with RAND USR 16514. Do not use the program if
you have less than 3.25K of memory or if you have used SCROLL - CLS will
negate this.
