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P H 4 4 0 N L X M o t h e r b o a r d U s e r G u i d e
S e p t e m b e r 1 9 9 8
MITSUBISHI ELECTRIC MOTHERBOARD DIVISION
PAGE 27 OF 51
BUS RESOURCE UTILISATION
ISA DMA Channels
DMA
Data Width
Usual Assignment
Audio
0
8-bit
ISA card
option
1
8-bit
ISA card
default 8-bit
2
8-bit
Floppy disk controller
3
8-bit
ECP parallel port
option
4
-
DMAC daisy chain
5
16-bit
ISA card
6
16-bit
ISA card
7
16-bit
ISA card
Shaded areas indicate DMA channels not normally available on the ISA bus
ISA Interrupts
IRQ
Usual Assignment
Fixed?
PCI
IRQ0
System timer
YES
IRQ1
Keyboard
NO
IRQ2
IRQ8 - 15 Cascade
YES
IRQ3
Serial port 2
NO
X
IRQ4
Serial port 1
NO
X
IRQ5
ISA/PCI bus (Audio)
NO
X
IRQ6
Floppy disk
NO
X
IRQ7
Parallel port
NO
X
IRQ8
Real time clock
NO
IRQ9
ISA/PCI bus
X
IRQ10
ISA/PCI bus
X
IRQ11
ISA/PCI bus
X
IRQ12
PS/2 Mouse
NO
X
IRQ13
Floating point error
YES
IRQ14
Primary hard disk
If drive connected
X
IRQ15
Secondary hard disk
NO
X
The last column indicates which ISA interrupts PCI devices can be routed to.
PCI Interrupts
Channel
Device
INTA#
Slots
INTB#
Slots