Code previously assembled without error using Version 1.11 of MPASM, now gives a number of Error 110: "Unmatched" and Error 113 : "Symbol not previously defined" errors, presumably in connection with labels. I have release notes for V1.21 but can't see anything immediatey obvious to explain why this should be ( but I'll stand corrected on this ) Any ideas ? ---------------------------------------------------------- Mike Hogben. Senior Engineer. mah@itl.co.uk.