User guide

PH440 NLX Motherboard User Guide September 1998
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