X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - phar lap 386/dos-extender

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INT 21 - Phar Lap 386/DOS-Extender - GET HARDWARE INTERRUPT VECTORS
        AX = 250Ch
Return: CF clear
        AL = base interrupt vector for IRQ0-IRQ7
        AH = base interrupt vector for IRQ8-IRQ15
        BL = interrupt vector for BIOS print screen function

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