Device
and operation
CPC307
C P C 3 0 7 U s e r M a n u a l
36
© 2 0 2 2 F a s t w e l v . 0 0 6
4.2.4 Distribution of interrupt lines
By default, interrupt requests are generated by devices included in the module. The interrupt
sources are shown in Table 4.6. Interrupt requests configuration is set in the BIOS Setup menu.
Table 4.6. Distribution of interrupt lines in the CPC307 module
Nodes that use interrupt
lines
NMI
Number of IRQ interrupt line
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
System timer
●
PS/2 keyboard
●
PS/2 mouse
●
Cascading
●
COM 1
○
●
○
○
○
COM 2
●
○
○
○
○
COM 3
○
●
○
○
○
COM 4
●
○
○
○
○
COM 5
●
COM 6
●
CAN 1
●
CAN 2
●
LPT
●
○
RTC
●
Ethernet
●
USB
●
●
●
●
Co-Processor
●
IDE (Primary Channel)
●
WDT0
○
○
○
○
○
○
○
○
○
○
○
○
WDT1
○
○
○
○
○
○
○
○
○
○
○
○
WDT2
o
○
○
○
○
○
○
○
○
○
○
○
External Isolated
Interrupt
o
○
○
○
○
○
○
○
○
○
○
○
PC-104
o
○
○
○
○
○
○
○
○
○
○
○
PCI-104
INT A
○
○
○
○
○
○
○
○
○
○
○
INT B
○
○
○
○
○
○
○
○
○
○
○
INT C
○
○
○
○
○
○
○
○
○
○
○
INT D
○
○
○
○
○
○
○
○
○
○
○
The conventional symbols used in Table 4.6:
Switching is not allowed
Switching is allowed
Switching is set by default
Switching is done via the IOCHK# signal of the ISA bus.
The allocation of hardware interrupts can only be changed using the BIOS.
The IRQ[3...7], IRQ[9...12], IRQ[14...15] interrupt lines are hardware connected to the PC/104
connector on the board.
○
●
o