Interface pinouts and interrupts
PS/2 keyboard port (optional)
The entries in parentheses are effective if the jumper X507 is inserted on 2-4 and
3-5.
1
4
2
3
5
6
Pin Meaning
1 Keyboard
data
2
not used (mouse data)
3
0 V
4
+5 V
5 Keyboard
clock
6
not used or
keyboard
on/off
(mouse
clock)
Keyboard port (diode socket connector, optional)
1
4
2
3
5
Pin Signal
name
1 Keyboard
clock
2 Keyboard
data
3
0 V
4
+5 V
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Interface pinouts and interrupts
Interrupt Request Levels and DMA channels
Interrupt Request Levels and DMA channels are listed below.
Interrupt Request Levels
IRQ0 = timer 0
IRQ1 = keyboard
IRQ2 = interrupt cascading
IRQ3 = serial interface 2 (COM2/COM4)
IRQ4 = serial interface 1 (COM1/COM3)
IRQ5 = audio controller or free or parallel interface (LPT2)
IRQ6 = floppy disk controller
IRQ7 = parallel interface (LPT1/LPT3) or audio controller
IRQ8 = real-time clock interrupt
IRQ9 = audio controller or free
IRQ10 = audio controller or free
IRQ11 = free
IRQ12 = mouse
IRQ13 = math coprocessor
IRQ14 = IDE disk controller (connector IDE 1/2)
IRQ15 = IDE disk controller (connector IDE 3/4)
DMA channels
DMA0 = free
DMA1 = audio controller or free
DMA2 = floppy disk controller
DMA3 = free/ECP mode of the parallel interface or audio controller
DMA4 = DMA channel cascading
DMA5 = audio controller or free
DMA6 = free
DMA7 = audio controller or free
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A26361-D858-Z120-6-7619
