INT 15 - SYSTEM - READ SYSTEM STATUS (CONVERTIBLE)
	AH = 43h
Return: AL = status bits (see #00464)


Bitfields for Convertible system status:
Bit(s)	Description	(Table 00464)
 7	power low
 6	external power in use
 5	standby power lost
 4	power activated by alarm
 3	internal modem powered on
 2	RS232/parallel adapter powered on
 1	reserved
 0	LCD(Liquid Crystal Display) detached