X-Hacker.org- Programmers Reference 0.02b - int 0ch (12) (irq 4) comunications (com 1, mainly)

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INT 0Ch (12) (IRQ 4)     Comunications (COM 1, Mainly)

        Called by hardware 8259-1, IRQ 4

     Normal use:

                RS-232 Serial Handler (COM 1)

     Also used for:

                SDLC,                   BSC,

                Voice communications adapter

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