INT 15 - Compaq SLT/286 - READ POWER CONSERVATION/MODEM CONFIGURATION
        AX = 4600h
Return: AH = modem configuration information
            bit 0 powerup state (0 off, 1 on)
            bit 1 modem installed
            bit 2 IRQ line assignment (0 IRQ 4, 1 IRQ 3)
            bit 3 COM port assignment (0 = COM 2, 1 = COM 1)
            bit 4 modem state (0 not assigned, 1 assigned)
            bit 5 modem is on
        AL = power conservation status information
            bit 0  power source (0 internal, 1 external)
            bits 1-2 low battery state
                    00 no low battery condition
                    01 low battery 1
                    10 reserved
                    11 low battery 2
            bits 3-4 power conservation mode
                    00 automatic
                    01 on
                    10 off
                    11 reserved
        BH = default system inactivity timeout (1-21 minutes)
        BL = current system inactivity timeout (1-21 minutes)
        CH = default video display inactivity timeout (1-63 minutes)
        CL = current video display inactivity timeout (1-63 minutes)
        DH = default fixed disk drive inactivity timeout (1-21 minutes)
        DL = current fixed disk drive inactivity timeout (1-21 minutes)
SeeAlso: AX=4280h,AX=4601h,INT 77

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