INTERFERENCE SIMULATOR

by Mark Turner (a third time)



I've printed some pretty dodgy-sounding programs in Pitstop in my

time, but this one has to take the biscuit. It simulates your Spectrum

being switched off, and the resulting fuzzy black and white dots that

appear on the screen. What's this? Has old Jonathan finally gone off

his chump? Most certainly not! The thing is, you see, that you can

restrict this effect to a certain area of the screen. Obviously this

makes the program handy for doing special effects here and there.

Great, eh?



Having typed everything in and run it you'll once again be presented

with a demo displaying the program's full capabilities. Impressive

stuff, I'm sure you'll agree. To create a bit of interference of your

own you need to POKE 63056 with the x co-ordinate, 63057 with the y

co-ordinate, 63054 with the width and 63055 with the depth of the

block you want the effect to appear in. All these values are in

character squares, of course. Then repeatedly RANDOMIZE USR 63000 for

as long as you want the effect to last. Line 1300 produces a suitable

sound effect if you've got a 128K Speccy, and 1310 turns it off again.