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HIGH PERFORMANCE 486 SX/DX (MODEL 2270)

JC INFORMATION SYSTEMS CORPORATION

HIGH PERFORMANCE 486 SX/DX (MODEL 2270)

Processor

80486SX/80486DX/80486DX2

Processor Speed

25/33/40/50/50(internal)/66(internal)MHz

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

64MB

Maximum Video Memory

None

Cache

64/256KB

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slots (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Turbo LED

JP20

Power LED & keylock

J20

Reset switch

S1

Speaker

JP9

32-bit VESA local bus slots

SL1 & SL2

Turbo switch

JP19

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

CMOS memory normal operation

JP1

Pins 2 & 3 closed

 

CMOS memory clear

JP1

Pins 1 & 2 closed

 

External battery installed at J1

JP1

Open

 

Monitor type select monochrome/EGA

JP2

Open

 

Monitor type select CGA

JP2

Closed

Factory configured - do not alter

JP10

Closed

 

Jumper information unavailable

JP11

Unidentified

 

Jumper information unavailable

JP12

Unidentified

Factory configured - do not alter

JP21

Open

Factory configured - do not alter

JP22

Open

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

5MB

(4) 1M x 9

(4) 256K x 9

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

64MB

(4) 16M x 9

None

CACHE CONFIGURATION

Size

Bank 0

Bank 1

64KB

(4) 8K x 8

(4) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

Note: The location of banks 0 & 1 are unidentified.

CACHE JUMPER CONFIGURATION

Size

JP3

JP4

JP17

JP18

64KB

Pins 2 & 3 closed

Pins 2 & 3 closed

Open

Open

128KB

Pins 1 & 2 closed

Pins 1 & 2 closed

Closed

Open

256KB

Pins 2 & 3 closed

Pins 2 & 3 closed

Closed

Closed

CPU SPEED SELECTION

Speed

JP5

JP6

JP7

25MHz

Open

Open

Closed

33MHz

Closed

Open

Open

40MHz

Closed

Closed

Open

50iMHz

Open

Open

Closed

50MHz

Open

Closed

Open

66iMHz

Closed

Open

Open

CPU TYPE SELECTION

Type

JP8

JP13

JP14

JP15

JP16

80486SX

2 & 3

Open

2 & 3

Open

Open

80486DX

2 & 3

1 & 2

1 & 2

Closed

Open

Note: Pins designated should be in the closed position. If PQFP is installed, JP8 must be set to 1 & 2 and JP16 must be closed if an 80486DX or 80486DX2 is installed