INT 02 - external hardware - NON-MASKABLE INTERRUPT
Desc:   generated by the CPU when the input to the NMI pin is asserted
Notes:  return address points to start of interrupted instruction on 80286+
although the Intel documentation states that this interrupt is
typically used for power-failure procedures, it has many other uses
on IBM-compatible machines:
Memory parity error: all except Jr, CONV, and some machines
without memory parity
Breakout switch on hardware debuggers
Coprocessor interrupt: all except Jr and CONV
Keyboard interrupt: Jr, CONV
I/O channel check: CONV, PS50+
Disk-controller power-on request: CONV
System suspend: CONV
Real-time clock: CONV
System watch-dog timer, time-out interrupt: PS50+
DMA timer time-out interrupt: PS50+
Low battery: HP 95LX
Module pulled: HP 95LX

02 - external hardware - NON-MASKABLE INTERRUPT