Teknor Industrial Computers VIPer807 Technical Reference Manual page 46

4.03.2 INTERRUPT CONTROLLERS
Two 8259 interrupt controllers handle the interrupts on the VIPer807. Six interrupt lines
are directly linked to the keyboard controller, timer, the real-time clock, both serial ports
and the parallel port. Note that with Plug and Play, interrupt lines for I/O devices and the
SCSI interface can be modified via software per system requirements.
TABLE 4-2: 8259 Interrupt Controllers
CONTROLLER # 1
IRQ 0 Timer 0
IRQ 1 Keyboard
IRQ 2 Cascade controller # 2
IRQ 3 COM 2*
IRQ 4 COM 1*
IRQ 5 Available (LPT2)*
IRQ 6 Floppy controller*
IRQ 7 LPT 1*
* All functions marked with an asterisk (*) can be disabled or reconfigured.
4.03.3 COUNTER/TIMERS
There are three independent 16-bit 8254 Counter/Timers: Counter/Timer 0 is tied to
Interrupt 0, Counter/Timer 1 is used to generate the refresh with DMA Channel 0, and
Counter/Timer 2 is used for the Speaker Port.
CONTROLLER # 2
IRQ 8 Real-time clock
IRQ 9 Available (SCSI)
IRQ 10 Available
IRQ 11 Available
IRQ 12 PS/2 Mouse
IRQ 13 Coprocessor
IRQ 14 IDE*
IRQ 15 Available
Installing & Working With System Components 4-5