Funny, I didn't see that call in the include file. ;-) >> call _ex_op1_op2 ; swap OP1 and OP2 >> call _ex_op1_op3 ; swap OP1 and OP3 >> rst 30h ; _FPADD -- OP1 = OP1 + OP2 >> ; OP1 = OP1 + OP3, OP3 = old OP1, OP2 = old OP3 > >or > call _OP3TOOP2 > rst 30h