INT 0bH is a hardware-generated interrupt (IRQ 3) forced by COM2 or COM4
when it is done sending or receiving a byte of data.
ÛÝCPU Exception InterruptÞÛ
286+ computer execute INT 0bH when the CPU is in protected mode and it
detects a Segment Not Present exception.
See Also: IRQs: Hardware Interrupts
Serial Ports
BIOS Data Area
ROM-BIOS Functions
DOS Functions
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