Fast Display
by Daniel Freeman
from Sinclair Programs, May 1982, page 20

DANIEL FREEMAN of Ramsgate, Kent, writes: "On page 12 of the printer manual is
a Basic routine which puts the contents screen into the array A$ so that it can
be recalled instantly by using PRINT AT 0, 0;A$. Although very useful, even in 
FAST mode it takes a long time to RUN. My machine code version does the same 
job instantly."

In the listing displayed, the first lines are the loader listing which can be 
put at the beginning of your program and will POKE the machine code into the 
REM statement, so that it can be recalled by a line like LET A=USR 16514.

The rest of the listing is a demonstration of what the routine can achieve. Ten
concentric circles are drawn very slowly and the display saved after every 
circle. The computer then replays the pictures at machine code speed.
