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486 BABY EISA (REV. 2.0)

TYAN COMPUTER CORPORATION

486 BABY EISA (REV. 2.0)

   

Processor

80486SX/80487SX/80486DX

Processor Speed

20/25/33/40/50MHz

Chip Set

OPTI

Max. Onboard DRAM

128MB

Cache

64/128/256/512KB

BIOS

AMI/Phoenix

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

   

CONNECTIONS

Purpose

Location

Purpose

Location

Speaker

J4

Turbo LED

J7

Power LED & keylock

J5

Reset switch

S9

Turbo switch

J6

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Snooping/flush select 20MHz

JP8

Closed

 

Snooping/flush select 25/33/40/50MHz

JP8

Open

Monitor type select color

JP9

Closed

 

Monitor type select monochrome

JP9

Open

CPU speed select iOSC/1

JP12

pins 1 & 2 closed

 

CPU speed select iOCS/2

JP12

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

4MB

(4) 1M x 9

NONE

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

64MB

(4) 16M x 9

NONE

128MB

(4) 16M x 9

(4) 16M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

64KB

(4) 8K x 8

(4) 8K x 8

128KB

(4) 32K x 8

NONE

256KB

(4) 32K x 8

(4) 32K x 8

512KB

(4) 128K x 8

NONE

CACHE TAG CONFIGURATION

Size

TAG (U54)

TAG (U55)

TAG (U56)

TAG (U72)

64KB

(1) 64K x 1

(1) 8K x 8

NONE

(1) 64K x 1

128KB

(1) 64K x 1

(1) 8K x 8

NONE

(1) 64K x 1

256KB

(1) 64K x 1

(1) 8K x 8

(1) 8K x 8

(1) 64K x 1

512KB

(1) 64K x 1

(1) 32K x 8

NONE

(1) 64K x 1

CACHE JUMPER CONFIGURATION

Size

JP2

JP3

JP4

JP5

JP16

JP17

JP18

64KB

2 & 3

Open

Open

Open

Open

Open

Open

128KB

1 & 2

Closed

Closed

Open

Closed

Open

Open

256KB

2 & 3

Closed

Closed

Open

Closed

Open

Closed

512KB

1 & 2

Closed

Closed

Closed

Closed

Closed

Closed

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP1

JP10

JP11

80486SX

pins 2 & 3 closed

pins 2 & 3 closed

Open

80487SX

pins 2 & 3 closed

pins 1 & 2, 3 & 4 closed

pins 1 & 2 closed

80486DX

pins 1 & 2 closed

pins 1 & 2, 3 & 4 closed

pins 2 & 3 closed

CPU SPEED CONFIGURATION

Speed

JP6

JP7

20MHz

Open

Open

25MHz

Open

Open

33MHz

Open

Closed

40MHz

Closed

Open

50MHz

Closed

Closed