Mel: I'm not exactly sure which numbers you want to switch, but maybe you could use one of the bit functions in the Toolbox, such as BITNOT or BITXOR. >I just bet someone has a real fast efficient way of turing those digits >around (they are in binary in the file). If I was still in Z80, I'd do a >rotate thru the carry. I'm not. ____________________ Use e-mail with integrity. Mark Goodes (wave@...)