INT 71 - IRQ9 - REDIRECTED TO INT 0A BY BIOS
Notes:  may be masked by setting bit 1 on I/O port A1h
the default BIOS handler invokes INT 0A for compatibility, since the
pin for IRQ2 on the PC expansion bus became the pin for IRQ9 on the
AT expansion bus.
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 59

See also: 0A

71 - IRQ9 - REDIRECTED TO INT 0A BY BIOS