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Int 15 Fn 43 - System - Read System Status (convertible) [B]
AH = 43h
Return: AL = status bits (see below)
Bitfields for Convertible system status:
bit 0 LCD detached
bit 1 reserved
bit 2 RS232/parallel adapter powered on
bit 3 internal modem powered on
bit 4 power activated by alarm
bit 5 standby power lost
bit 6 external power in use
bit 7 power low
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