Further HELP with FCS I/O error codes can be obtained by typing HELP FCS ERROR NN. The error codes to follow are of the form IE.XXX, ad the values themselves are octal octal numbers appearing in the low byte of an error code word. 2 ERROR @LB1:FCSERROR.HLP 2 DUMMY # AT PRESENT FCS HELP IS LIMITED TO HELP FCS ERROR NN.