CLASS 3304 Motherboard Settings and Configuration

Processor

80386SX

Speed

16/20MHz

Chip Set

Unidentified

Max. Onboard DRAM

1MB

BIOS

Unidentified

Cache

None

Dimensions

353mm x 265mm

I/O Options

Proprietary external memory card, VGA port, parallel port, serial ports (2), floppy drive interfaces (2), IDE interface, proprietary AT bus

NPU Options

80387SX

CONNECTIONS

Purpose

Location

Purpose

Location

VGA port

J1

IDE interface

P8

External floppy drive interface

J2

Internal floppy drive interface

P9

Parallel port

J6

IDE/floppy drive power

P10

Serial port (9 pin)

P4

Proprietary external memory port

S1

Serial port (25 pin)

P5

Proprietary AT bus slot

S2

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

»

CMOS memory normal operation

JP1

pins 1 & 2 closed

CMOS memory clear

JP1

pins 2 & 3 closed

»

Bus speed select slow

SW1/1

Off

Bus speed select fast

SW1/1

On

»

Pipeline mode disabled

SW1/2

Off

Pipeline mode enabled

SW1/2

On

»

Memory 0-512KB enabled

SW1/3

Off

Memory 0-256KB enabled, 256-512KB disabled

SW1/3

On

»

Memory 512-1024KB enabled

SW1/4

Off

Memory 512-1024KB disabled

SW1/4

On

»

SMEM - Command in intern cycles disabled

SW1/5

On

SMEM - Command in intern cycles enabled

SW1/5

Off

»

CPU speed select automatic

SW1/6

Off

CPU speed select 8MHz

SW1/6

On

»

Monitor type select color

SW2/1

On

Monitor type select monochrome

SW2/1

Off

»

Power on speed select high

SW2/2

On

Power on speed select low

SW2/2

Off

»

Factory configured - do not alter

SW201/1

Off

»

Factory configured - do not alter

SW201/2

Off

»

BIOS type select AT

SW201/3

Off

BIOS type select PS/2

SW201/3

On

»

Monitor type select standard display

SW201/4

Off

Monitor type select multisync display

SW201/4

On

»

Monitor type select VGA enabled

SW201/5

On

Monitor type select VGA disabled

SW201/5

Off

»

Standard interrupt handling

SW201/6

Off

Special application interrupt

SW201/6

On

»

Floppy drive interface enabled

SW301/1

On

Floppy drive interface disabled

SW301/1

Off

»

IDE drive installed

SW301/2

Off

IDE drive not installed

SW301/2

On

»

AT bus IDE interface pin 34 select -PDIAG

SW301/3

Off

AT bus IDE interface pin 34 select GND

SW301/3

On

»

IDE interface enabled

SW301/4

Off

IDE interface disabled

SW301/4

On

»

Factory configured - do not alter

SW301/5

Off

»

CMOS memory normal operation

SW301/6

On

CMOS memory clear

SW301/6

Off

USER CONFIGURABLE SETTINGS (CON'T)

»

Parallel port enabled

SW601/1

Off

Parallel port disabled

SW601/1

On

»

Parallel port address select 378 - 37Fh

SW601/2

Off

Parallel port address select 278 - 27Fh

SW601/2

On

»

Serial port (P5) enabled

SW601/3

Off

Serial port (P5) disabled

SW601/3

On

»

Serial port (P4) enabled

SW601/4

Off

Serial port (P4) disabled

SW601/4

On

»

Serial port (P5) address select 3F8 - 3FFh

SW601/5

Off

Serial port (P4) address select 3F8 - 3FFh

SW601/5

On

»

Factory configured - do not alter

SW601/6

Off

  Notes: On main boards not having a JP1, CMOS memory functions are controlled by SW301/switch 6.

Chipset & CPU locations unverified.

DRAM CONFIGURATION

Size

Bank 0

1MB

(8) 44256

Note:Memory size and location is unidentified.

DRAM MAPPING CONFIGURATION

Ext memory

Mapping area

SW2/3

SW2/4

SW2/5

SW2/6

0MB

100000 - 160000h

Off

On

On

On

1MB

200000 - 260000h

On

Off

On

On

2MB

300000 - 360000h

Off

Off

On

On

3MB

400000 - 460000h

On

On

Off

On

4MB

500000 - 560000h

Off

On

Off

On

5MB

600000 - 660000h

On

Off

Off

On

6MB

700000 - 760000h

Off

Off

Off

On

7MB

800000 - 860000h

On

On

On

Off

8MB

900000 - 960000h

Off

On

On

Off

9MB

A00000 - A60000h

On

Off

On

Off

10MB

B00000 - B60000h

Off

Off

On

Off

11MB

C00000 - C60000h

On

On

Off

Off

12MB

D00000 D60000h

Off

On

Off

Off

13MB

E00000 - E60000h

On

Off

Off

Off

14MB

F00000 - F60000h

Off

Off

Off

Off

DRIVE CONFIGURATION

Type

SW401/1

SW401/2

1 internal; drive A or 2 internal; drive A in lower slot/drive B in upper slot or 1 internal, 1 external; internal drive A/external drive B

Off

Off

1 external; drive A or 2 internal; drive A in upper slot/drive B in lower slot or 1 internal, 1 external; internal drive B/external drive A

On

On