MIRRHEX:   	MOV DPTR, #INV_HEX-1 ; -1 was missing
			MOV MIRHEX1,#0FFH    ; # was missing
			MOV MIRHEX2,A
	CHKLUP:    	INC DPTR
			INC MIRHEX1
			MOV A, MIRHEX1
                        CLR C                ; this instr. was missing
			SUBB A, MIRHEX2
			JNZ CHKLUP
			MOV A, #0
			MOVC A, @A+DPTR
			RET