HU430 NLX Motherboard User Guide
124575UG Revision 2
Mitsubishi Electric PC Division
Page 12 of 21
The PIIX4E can support up to 5 ISA slots on the riser. There are an additional two ISA
‘loads’ used on the motherboard: the audio and super i/o controllers.
2.11.2 Peripheral Component Interconnect (PCI)
The motherboard can support up to 3 bus master PCI slots on the NLX riser.
2.12 Bus Resource Utilisation
2.12.1 ISA DMA Channels
DMA
Data
Width
Usual Assignment
Audio
Combo
0
8-bit
option
1
8-bit
Audio (8-bit)
option
option
2
8-bit
Floppy disk controller
option
3
8-bit
ECP parallel port
option
option
4
-
DMAC daisy chain
5
16-bit
6
16-bit
7
16-bit
Shaded areas indicate DMA channels not normally available on the ISA bus
2.12.2 ISA Interrupts
IRQ
Usual Assignment
Audio
Combo
0
Timer 0
1
Keyboard
option
2
PIC daisy chain
option
3
Serial port 2
option
4
Serial port 1
option
5
Audio
option
option
6
Floppy disk controller
option
7
Parallel port
option
option
8
Real-time clock
option
9
Video
option
option
10
option
11
option
option
12
Mouse
option
option
13
Co-processor
option
14
Primary IDE
option
15
Secondary IDE
option
option
Shaded areas indicate IRQs not normally available on the ISA bus
