I tried PSET and LINE in all 9 screen modes but each time i try it it responds with Illegal Function Call

Try

10 SCREEN 5
20 COLOR 15,0,0
30 LINE (0,0)-(100,100),15
40 GOTO 40

and then

RUN

(wow )

syntax:

LINE(X-start, Y-start)-(X-end, Y-end),color

I didn't even test it but this should work.


just typing

SCREEN 5
LINE ..
etc
won't work, because BASIC returns to SCREEN 0 everytime this way. SO, you'll have to create a listing and RUN it. (Somehow I have the feeling this is the mistake you made)