INT 15h,  43h (67)       Read System Status                       Convertible

    Reports the status of the system for the PC Convertible.

       On entry:      AH         43h

       Returns:       Carry      Set if error, else cleared
                      AH         Modified
                      AL         Status (see below)

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               Status (AL)
            7 6 5 4 3 2 1 0
            1 . . . . . . .       Low battery
            . 1 . . . . . .       Operating on external power source
            . . 1 . . . . .       Standby power lost
            . . . 1 . . . .       Power activated by real-time clock alarm
            . . . . 1 . . .       Internal modem power-on
            . . . . . 1 . .       Serial/parallel power-on
            . . . . . . 1 .       Reserved
            . . . . . . . 1       LCD not attached
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       Notes:         This service is available only for the PC
                      Convertible.

                      If the standby power is lost (bit 5 is on), then the
                      real-time clock time will be incorrect.

                      See INT 1Ah, Service 08h, for power-on using the
                      real-time clock alarm.