SCROLL CLEAR (16K ZX81)
by Ian Bland, Northampton
from Your Computer (November 1982), Page 111

While messing around with my 16K ZX-81 I found a way to make the screen
Clear quickly after Scrolling. Normally, a CLS command or a return to
non-Scrolled Printing takes a long time because the display has to be
padded out with spaces on the expanded machines.

The trick is to artifically pad the display file on each scroll, by using a
TAB to move the PRINT position to the end of the line. By forcing the ZX-81
to print a full line of 32 spaces each time, the display file remains
intact.
