INT 2F - Communicating Applications Specification - GET DIAGNOSTICS RESULTS
        AX = CB13h
        DL = 00h
Return: AX = 0040h in progress
           >= 0    passed
           < 0     hardware-dependent failure code (see below)
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

Intel SatisFAXtion failure codes:
 bit 1  2400 bps data modem failed
 bit 0  9600 bps FAX modem failed

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