.IOC. OBJECT PROGRAM DIAGNOSTICS

During the execution of an object program referring to .IOC. certain error condi-
tions may occur. They are termed irrecoverable and cause a halt. t  Diagnostic
information is displayed in the A- and B-Registers at the time of the halt.

The B-Register contains the absolute location of the JSB instruction of the request
call containing the illegal condition.

The A-Register contains a code defining the illegal condition:

A-Register      Explanation

  000000        Illegal request code.

  000001        Illegal unit-reference
                number on request.

  000002        The Standard unit re-
                quested is not defined
                as a particular device
                in the Equipment Table.

--------------------
t The halt is at the absolute location assigned to the symbol IOERR during Prepare
  Control System processing.

F-1