Device  Error                   Action

CDR     RN, RA invalid char     set RDCHK; if IOSTOP set, stop simulator with INVCHR
        unattached              stop simulator with UNATT (CHANGED - used to set RDCHK too)
        end of file             stop simulator witn NOCD (CHANGED - used to set RDCHK too)
        file read error         set RDCHK; stop simulator with IOERR
        input line too long     set RDCHK; stop simulator with IOERR

CDP     WN,DN invalid digit     set WRCHK; if IOSTOP set, stop simulator with INVCHR
        WA invalid char         set WRCHK; if IOSTOP set, stop simulator with INVCHR
        unattached              stop simulator with UNATT (CHANGED - used to set WRCHK too)
        file write error        set WRCHK; stop simulator with IOERR

LPT     bad K control field     set PRCHK; if IOSTOP set, stop simulator with INVFNC
        WN,DN invalid digit     set PRCHK and WRCHK; if IOSTOP set, stop simulator with INVFNC
        WA invalid char         set PRCHK and WRCHK; if IOSTOP set, stop simulator with INVFNC
        unattached              stop simulator with UNATT (CHANGED - used to set WRCHK too)
        file write error        set PRCHK and WRCHK; stop simulator with IOERR

PTR     RN, RA invalid char     set RDCHK but complete operation; if IOSTOP set at end, stop simulator with INVCHR
        RN, RA parity error     set RDCHK but complete operation; if IOSTOP set at end, stop simulator with INVCHR
        WN, DN invalid digit    set WRCHK; if IOSTOP set, stop simulator with INVCHR
        WA invalid char         set WRCHK; if IOSTOP set, stop simulator with INVCHR
        unattached              stop simulator with UNATT (CHANGED - used to set WRCHK too)
        file write error        set WRCHK; stop simulator with IOERR

TTY     RN, RA invalid char     ignored, echoed as beep/bell
        WN, DN invalid digit    ignored, printed as :
        WA invalid char         set WRCHK; if IOSTOP set, stop simulator with INVCHR
