X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 15 - system

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