Quick Reference Guide

DP 7400/7500 Series
Quick Reference Guide

Jumper Settings

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Figure 2-2, DP 7400/7500 Series Board Layout & End Bracket

Jumper	Function	Jumper 1-2	Jumper 2-3
JP1	SCSI Termination	Enabled	Disabled
JP2	Video Controller	Enabled	Disabled
JP3	Ethernet Controller	Enabled	Disabled
JP4	SCSI Controller	Enabled	Disabled
JP5	External Raid	Enabled	Disabled
J7	Keyboard & Mouse Emulation	Jumper OFF Enabled	Jumper ON Disabled
JP11	Flash BIOS	Jumper ON Enabled	Jumper OFF Disabled

Other Processor Board Jumpers

Jumpers JP6, 7, 8, 9 & 10 are processor dependent, and should not be changed from the factory settings.

Processor Termination

If only a single Pentium Processor is installed on the DP 7400/7500 board, a special termination card must be installed in the empty processor slot.

LEDs

Ethernet Adapter LED's

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Near the RJ-45 connector and visible in the mounting bracket are two sets of light emitting diodes (LEDs).

On the upper set:

The green LED indicates network activity.

The amber LED is not connected.

On the lower set:

The green LED will light when the interface has a valid connection to an Ethernet hub.

The amber LED will light when the interface is set to 100 Mbit/s.

SCSI Activity LED

There is an LED located between the internal and external SCSI connector which will be amber when the SCSI is busy.

Power LED

These is a Board Power LED between the COM2 and Fan Connector. This LED will be green when there is power to the board.

Memory Configuration & Management

DIMMs are 168 pin, 100MHZ (PC 100) ECC SDRAM (72 bits)
DIMMs do not need to be installed in pairs, and different sizes may be mixed.
DIMMs may be either registered or unbuffered. However, registered and unbuffered DIMMs may NOT be mixed.
DIMMs must have gold contacts (edge connectors).

Table 4-1, Memory Map

Memory Range	Size	Use
00000-9FFFF	640KB	Conventional Memory
A0000-AFFFF	64KB	VGA Graphics Buffer
B0000-B7FFF	32KB	MDA Text Buffer
B8000-BFFFF	32KB	VGA/CGA Text Buffer
C0000-C7FFF	32KB	VGA Bios
C8000-DFFFF	96KB	Available
E0000-FFFFF	127KB	System & PCI BIOS

Table 4-2, I/O Map

ISA Ports	Description
0000-00FF	Various "AT" functions in ISP chip and keyboard controller
01F0-01F7	IDE hard drive interface
02F8-02FF	COM2
03A0	Cubix supervisory interface
03A8-03AF	IES serial port
03B4-03B5	VGA
03BC-03BF	LPT1
03C0-03CF	VGA
03D4-03D5	VGA
03F0-03F7	Floppy / IDE
03F8-03FF	COM1

System Interrupts

The 16 system hardware interrupts on the SP are represented in Table 4 - 4. Interrupts are managed by two standard 8259A Programmable Interrupt Controllers (PICs). Interrupts at IRQ 0 through 7 are located on the main PIC; IRQ 8 through 15 are on the SLAVE PIC.

Table 4-3, System Interrupts

IRQ	Description	IRQ	Description
0	Timer clock	8	Real Time Clock
1	Keyboard	9	Redirected IRQ 2
2	Second OIC controller	10	Set By PCI Plug & Play at boot time
3	COM2	11	Set By PCI Plug & Play at boot time
4	COM1	12	Available (or PS/2 Mouse)
5	Set By PCI Plug & Play at boot time	13	Math Coprocessor
6	Floppy Disk Controller	14	Primary IDE Controller
7	LPT1	15	Secondary IDE Controller (or IES)