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INT 2F - Multiplex - Communicating Applications Spec - GET DIAGNOSTICS RESULTS
        AX = CB13h
        DL = 00h
Return: AX = 0040h in progress
           > 0     passed
           < 0     failure code
Note:   diagnostics return values are hardware dependent
SeeAlso: AX=CB13h/DL=01h

Intel Connection CoProcessor failure codes:
        bit 3: 9600 bps FAX modem module failed
        bit 2: SDLC chip failed
        bit 1: RAM failed
        bit 0: ROM checksum failed