Can someone help me with BASIC...

[jj]

IF you are using blizt basic or most decent basics.  You can set the screen you are drawing to.  As the last poster says draw the next screen to the background screen.  Then when you character reaches the screen just flip.  Its basically double screen buffering.   Might be cool speed wise to do this in the main game loop befopre your character gets to the edge of screen.  Only problem is if you have four possilbe screens then yopu will have to draw it as they get to the edge.  but still do the flip as it wil lapeear as screen just apperaing as opposed to being drawn.
 
Does this make sense ?

[jj]

Thats a pretty good idea.  Though depends how quickly the screen draw takes.  If you are re-drawing a screen to the back buffer everytime a player changes direction might slow the game down quite a lot.  Suppose it depends how long screen draw takes, and what the target system spec is.

[jj]

Out of interest what basic are you using, blitz or amos and is this for Amiga or other platform ?
 
I perosnally from a users point of view prefer a smooth scroll rather than flipping screen.

[jj]

QBasic as in the really old basic that came with ms-dos ?  If you are doing it on PC would still suggest blitz basic .