@mozipha Thanks for the extra tips. Very useful. I've just started a chess PGN file reader. Hoping to convert e4, d4 etc. to x?, y? and then plot an appropriate sprite to the screen. I want to be able to replay a complete game move by move on a nice onscreen chess board. I've got a feeling this is going to be a long program with many lines. Should be fun. By the way, any idea how to find the length of a saved file? Thanks.