CLASS 3421 Motherboard Settings and Configuration

Processor

80386SX

Processor Speed

20MHz

Chip Set

NCR

Max. Onboard DRAM

8MB

Cache

None

BIOS

AMI

Dimensions

381mm x 254mm

I/O Options

Serial port, parallel port, PS/2 mouse port, SCSI interface (2), floppy drive interface, CPU upgrade slot, proprietary SIMM sockets (3)

NPU Options

80387SX

CONNECTIONS

Purpose

Location

Purpose

Location

Video controller

CN1

IDE/floppy drive power

CN8

Internal SCSI interface

CN2

FS1 header

JP1

External SCSI interface

CN3

SCSI terminating resistors

R1, R2, R3

Serial port

CN4

Proprietary SIMM socket

S1, S2, S3

Parallel port

CN5

MCA slot

S4, S5, S6, S7

PS/2 mouse port

CN6

CPU upgrade slot

S8

Floppy drive interface

CN7

Note: Pin 1 locations unverified.

DRAM CONFIGURATION

Size

Bank 0

S1

S2

S3

2MB

2MB

NONE

NONE

NONE

4MB

2MB

(1) 1M x 18

NONE

NONE

6MB

2MB

(1) 1M x 18

(1) 1M x 18

NONE

8MB

2MB

(1) 1M x 18

(1) 1M x 18

(1) 1M x 18

Note: Bank 0 factory installed and is not configurable. Locations and individual chip sizes for Bank 0 inside DRAM area are unknown.