ZOOOOOM!

by Chris Pile



[A Block Line Delete listing by J.M. Clough was printed here.  JimG]



Usefulness is simply emanating from these pages this month. I can

barely believe it myself. After the superlativeness of the last

offering we now have Chris Pile and his excellent (and short) Quadrant

Magnifier which'll allow you to zoom in on a specific quarter of the

screen. Wowsers.



Simple Pimple

To get magnifying just type in the self-sufficient, user-friendly

Basic program. Once RUN, this will assemble the code in memory (at

address 63400 incidentally) and SAVE it for you. Cor; some people

don't know how easy they have it. Afterwards NEW the computer to clear

the BASIC away. The code will remain intact.



Zooooom!

First thing to do is specify which quadrant is to be magnified. You do

this by POKEing.a value into address 63401 (0 - Top left, 1 - Top

right, 2 - Bottom left, and 3 - Bottom right). So if you wanted to

magnify the bottom left you'd POKE 63401,2 and so on. Follow up the

POKE with RANDOMIZE USR 63400. A magnified version of that part of the

screen will now fill the entire screen. Repeating this process

produces a sly little zoom effect.