HU430 NLX Motherboard User Guide
124575UG Revision 2
Mitsubishi Electric PC Division
Page 3 of 21
1 Overview
The HU430 motherboard is an NLX form factor socket 7 design, with a local bus speed of 60
or 66MHz. The design is based around the Intel 430TX chipset. The board was designed to be
compliant with the NLX specification 1.2 and must be used with an NLX riser that also
conforms to this specification.
1.1 Motherboard Features
Form factor
NLX, 9.0" wide x 10.0" long
Processors
Socket 7 - P54C, P55C, K6, 60/66MHz bus speed
Power regulation
Adjustable processor core voltage regulator 2.1V to 3.6V, optional
3V3 regulator for 4 o/p PSUs
Core logic
Intel 430TX with PIIX4E ISA bridge
Cache
256KB or 512KB on-board L2
Memory – RAM
2 DIMMs for 64-bit unbuffered SDRAM (or EDO)
Memory - Flash ROM
2Mb: BIOS/Setup, USB, DMI, 120FD
Buses
3 bus master PCI slots and ISA
VGA
ATI VT3 (VT-B) part standard, 3D-RAGE II+ compatible, 1MB
40ns EDO upgradeable to 2MB
Audio – controller
Business audio only, Crystal CS4236B
Audio – features
MIDI/joystick header
Audio – output
Mono internal speaker, ‘PHONES OUT, MIC IN jacks on
motherboard rear panel
Hard Disk & CD-ROM Dual ATA33 (UltraDMA/33)
Floppy Disk
Standard 3.5”, 5.25” & tape drives. Support for 120MB via IDE
Parallel Port
IEEE 1284 (ECP & standard)
Serial Ports
2x 16550s: 9-way ‘D’ COM1, COM2
USB
Dual USB connector; optionally one channel can be routed to the
NLX riser
Keyboard & Mouse
Dual-stacked PS/2 style keyboard/mouse connectors
Security
BIOS branding
IR I/O
IR routed to NLX riser, but not IRDA control signals
Power Management
Uses SMM. IRQ wake-up. Magic Packet & PCI PME# supported
Cooling
NLX fan signal and CPU fan switched by GPIO port in standby,
CPU fansink connector on motheboard
System Management
DMI instrumentation chip LM78 as optional fit
Plug & Play
PC97 compliant
Battery back-up
On-board lithium coin cell with 5 years life
PCB
9.0" wide by 10.0" long, all top-side components
