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INT 0A - IRQ2 - EGA VERTICAL RETRACE
Notes:  the TOPS and PCnet adapters use this interrupt request line by default
        DOS 3.2 revectors IRQ2 to a stack-switching routine
        on ATs and above, the physical data line for IRQ2 is labeled IRQ9 and
          connects to the slave 8259.  The BIOS redirects the interrupt for
          IRQ9 back here.
        under DESQview, only the INT 15h vector and BASIC segment address (the
          word at 0000h:0510h) may be assumed to be valid for the handler's
          process
SeeAlso: INT 52, INT 71