Click above to get retro games delivered to your door ever month!

INT 21 - Phar Lap 386/DOS-Extender - SET REAL- & PROTECTED-MODE INT VECTORS
        AX = 2507h
        CL = interrupt number
        DS:EDX -> 48-bit address of protected-mode interrupt handler
        EBX = 32-bit address of real-mode interrupt handler
Return: CF clear
Note:   interrupts are disabled until both vectors have been modified
SeeAlso: AX=2504h,2505h