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INT 21 - Phar Lap 386/DOS-Extender - SET INT TO ALWAYS GAIN CONTRL IN PROT MODE
        AX = 2506h
        CL = interrupt number
        DS:EDX -> 48-bit address of protected-mode interrupt handler
Return: CF clear
Note:   This function modifies both the real-mode low-memory interrupt
          vector table and the protected-mode Interrupt Descriptor Table (IDT)
        Interrupts occurring in real mode are resignaled in protected mode.