Quick Reference Guide

BC 7300 Series
Quick Reference Guide

Jumper & Switch Settings

BC 7300 Series Board Layout & End Bracket

Switch Settings

S1, Switch 1 and 2 - Supervisory Interrupt

The IES (Intelligent Environmental Sensor) module in the Density System communicates with the BC processors in the system via a hardware interrupt which is configurable as either IRQ 10 or IRQ 15. The interrupt is set with switch 1.

Table 2-1, S1 Switch Settings

Function	1	2
Supervisory Interrupt IRQ 10	on	off
Supervisory Interrupt IRQ 15 *	off	on
No Supervisory Interrupt	off	off
*Factory Settings	on	off

Jumper Settings

The figure above shows the connector, switch and jumper locations on the board. Tables 2-2, 2-3 and 2-4 define jumper settings.

JP5 - Ethernet

The on-board DEC 21140 PCI Fast Ethernet (10/100 Mbps) controller can be disabled in the system BIOS and via hardware with jumper JP5.

JP8 - SCSI

The on-board Symbios 895 SCSI controller can be enabled or disabled in the system BIOS and via hardware with jumper JP8.

JP6 - VGA

The on-board S3 video controller can be enabled or disabled in the system BIOS and via hardware with jumper JP6.

Table 2-2, Jumpers JP2 to JP4

Jumper	Function	Enabled	Disabled
JP1	Password Disable	Jumper On	Jumper Off
JP3	Enable Flash Programing	Jumper On	Jumper Off
JP5	Ethernet	Jumper On Pins 1-2	Jumper On Pins 2-3
JP6	VGA Video	Jumper On Pins 1-2	Jumper On Pins 2-3
JP7	SCSI Termination	Jumper On	Jumper Off
JP8	SCSI	Jumper On Pins 1-2	Jumper On Pins 2-3

JP9, JP10, JP11, & JP12 - CPU Voltage And Speed (Do Not Change)

Memory Configuration & Management

All SP Series memory is provided in 168 pin, 72 bit standard 60ns buffered DIMMs. DIMMs do not need to be installed in pairs, and different sizes may be mixed on a SP. Table 4-1 shows the Memory map for the SP processor. Table 4-2 defines the boards I/O configuration.

Click here for the DIMM Memory Configuration Table

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)