From DECsystem-10 / DECSYSTEM-20 Processor Reference Manual (June, 1982) MOVEI AC,1 SETZ AC+1, ;Big binary integer MOVEI AC+3,1 ;One digit byte EXTEND AC,[CVTBDO] ;Convert will abort TLNE AC+3,200000 ;Test effect on N JRST KL10 ;KL10 if N set JRST KS10 ;KS10 if N unaffected From TOAD-1 System Architecture Reference Manual (April, 1997) CVTBDO Convert Binary to Decimal Offset [...] CVTBDT Convert Binary to Decimal Translated [...] Caution: In the KL10 the N and M flags are set up first and may therefore be affected even by an instruction that is aborted becuase the binary integer is too large.