>What does the "~" mean when used in the following way? > > ANDLW ~SWITCHLINES ; keep unused outputlines from PortB > >I can't find a reference that details all the special commands like $...etc. There is a reference - it is the MPASM manual. ~ means to compliment. In this case, 'SWITCHLINES' is a constant (literal) which is being complimented (inverted) by the assembler. dwayne Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (403) 489-3199 voice (403) 487-6397 fax