ZX81 SCREEN PRINT (ZX-81)
by Dennis Clinton
from ZX Computing (August 1986), page 61

Here is a short, six byte routine which will let you COPY as many lines of
the screen as you like (up to a maximum of 24)!

Dennis Clinton of California sent us this one and it should work on machines
both sides of the Atlantic. The second POKE line determines how many lines of
the screen will be copied on the ZX/Alphacom/Timex type printer, so change the
number 24 to suit your needs.

Once the code has been poked into the line 1 REM statement, the other lines con
be deleted one at a time. The COPY routine can be used at any stage in the
program by RAND USR 16514 BUT the line 1 REM with the machine code must still
be there. The program makes use of the fact that the 81's own COPY routine
expects the register pair to contain the number of lines to be copied before
calling it. We simply set it to the number of our choice.
