ERDEV$                   Device Causing Critical Error

 s$ = ERDEV$

    Returns the name of the device that has caused an INT 24h (critical
    error).

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      Notes:    If the device is a character device, ERDEV$ returns the
                eight-bit device name. If the device is a block device,
                ERDEV$ returns a two-character string consisting of the
                drive letter and a colon.

                ERDEV$ is a read-only variable.