ASSMAP v 1.3.1 fixes a problem in earlier optimizing versions. The problem only occurs after generating a store of a SET, and the optimizer could generate an erroneous following address. If your program is not using sets, the situation does not arise. Otherwise, see if v 1.3.1 generates the same code size as 1.3.0 (you need only the TIC file for this, and need not save the output .MAC file). If the size is the same, the situation did not arise. Otherwise, regenerate the code file. ASSMPCD and .PCD code modules are unaffected. cbf 87/01/16