Just a guess, and I'm not familiar with radio shack printers but, from my
expereince with Epson and Diablos, you should be able to set the margins of the
printer. I do it on my Epson by sending the correct control codes (really
escape codes) by way of LPRINT from BASIC. By the by, for anyone with and Epson
(I know I'm a tad off the subject), you ca can send an ESCAPE by typing GRPH k
either in TEXT or BASIC (in a PRINT cmd) Hope this helps.
Glenn