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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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