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