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486SI4 (M-81)

UNIDENTIFIED

486SI4 (M-81)

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

20/25/33/50(internal)/50/66(internal)MHz

Chip Set

C & T

Max. Onboard DRAM

32MB

SRAM Cache

128/256KB

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

32-bit local bus card slot

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo LED

J3

Reset switch

J6

Turbo switch

J4

Power LED & keylock

J7

Speaker

J5

32-bit local bus card

S1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Local bus data size select 32-bits

J8

pins 1 & 2 closed

 

Local bus data size select 16-bits

J8

pins 2 & 3 closed

Factory configured - do not alter

JP1

open

Monitor type select color

JP2

closed

 

Monitor type select monochrome

JP2

open

Factory configured - do not alter

JP3

pins 2 & 3 closed

Factory configured - do not alter

JP4

pins 2 & 3 closed

Factory configured - do not alter

JP5

closed

CPU JUMPER CONFIGURATION

CPU

JP6

JP7

JP8

80486DX

closed

pins 1 & 2 closed

pins 1 & 2 closed

80487SX

closed

pins 2 & 3 closed

pins 1 & 2 closed

80486SX

open

open

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

SRAM JUMPER CONFIGURATION

Jumper

128KB

256KB

SR1

pins 2 & 3 closed

pins 2 & 3 closed

SR2

pins 2 & 3 closed

pins 2 & 3 closed

SR3

pins 2 & 3 closed

pins 2 & 3 closed

SR4

pins 1 & 2 closed

pins 2 & 3 closed

SR5

pins 1 & 2 closed

pins 2 & 3 closed

SR6

pins 2 & 3 closed

pins 2 & 3 closed

SR7

pins 2 & 3 closed

pins 2 & 3 closed

SR8

pins 1 & 2 closed

pins 2 & 3 closed

SR9

pins 1 & 2 closed

pins 2 & 3 closed

SRAM CONFIGURATION

Size

Cache SRAM

Location

TAG

128KB

(4) 32K x 8

Bank 0

(1) 8K x 8

256KB

(8) 32K x 8

Banks 0 & 1

(1) 8K x 8