SEE-THRU DATA SYSTEMS, LTD.

STO98C

Processor

80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2

Processor Speed

20/25/33/40/50(internal)/50/66(internal)

Chip Set

OPTI

Max. Onboard DRAM

32MB

SRAM Cache

64/128/256KB

BIOS

MR

Dimensions

220mm x 220mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J9

Turbo switch

JP12

Power LED & keylock

J18

Turbo LED

JP13

Speaker

JP11

Reset switch

S1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select monochrome

JP1

open

 

Monitor type select color

JP1

closed

»

CMOS memory normal operation

JP2

pins 2 & 3 closed

 

CMOS memory clear

JP2

pins 1 & 2 closed

SRAM CONFIGURATION

Size

Cache

Location

TAG (U31)

TAG (U32)

Dirty Bit (U42)

64KB

(8) 8K x 8

Banks 0 & 1

NONE

(1) 8K x 8

(1) 16K x 4

128KB

(4) 32K x 8

Bank 0

NONE

(1) 8K x 8

(1) 16K x 4

128KB

(4) 32K x 8

Bank 0

NONE

(1) 32K x 8

(1) 16K x 4

256KB

(8) 32K x 8

Banks 0 & 1

NONE

(1) 32K x 8

(1) 16K x 4

256KB

(8) 32K x 8

Banks 0 & 1

(1) 8K x 8

(1) 8K x 8

(1) 16K x 4

SRAM JUMPER CONFIGURATION

Size

JP3

JP4

JP7

JP8

64KB

pins 2 & 3 closed

pins 2 & 3 closed

open

open

128KB

pins 1 & 2 closed

pins 1 & 2 closed

closed

open

128KB

pins 1 & 2 closed

pins 1 & 2 closed

closed

open

256KB

pins 2 & 3 closed

pins 2 & 3 closed

closed

open

256KB 1

pins 2 & 3 closed

pins 2 & 3 closed

open

closed

Note 1 :Jumpers are in this position only when using (2) 8K x 8 in TAG sockets U31 & U32.

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) 256K x 9

(4) 1M x 9

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

Note:8 or 9-bit SIMMs can be used.

CPU SPEED CONFIGURATION

Speed

JF0

JF1

JP6

JP10

20MHz

closed

closed

pins 2 & 3 closed

open

25MHz

open

closed

pins 2 & 3 closed

open

33MHz(386/486DLC)

closed

open

pins 2 & 3 closed

pins 1 & 2 closed

33MHz(486)

closed

open

pins 2 & 3 closed

open

40MHz

open

open

pins 2 & 3 closed

pins 1 & 2 closed

50MHz (internal)

open

closed

pins 2 & 3 closed

open

50MHz

open

closed

pins 1 & 2 closed

pins 2 & 3 closed

66MHz (internal)

closed

open

pins 2 & 3 closed

open

CPU TYPE CONFIGURATION

Type

JP5

JP9

JP14

JP15

JP16

JP17

80386DX

1 & 2, 3 & 4

1 & 2, 3 & 4

1 & 2

1 & 2

2 & 3, 4 & 5

closed

CX486DLC

1 & 2, 3 & 4

1 & 2, 3 & 4

1 & 2

1 & 2

2 & 3, 4 & 5

closed

80486SX

2 & 3

open

1 & 2

2 & 3

2 & 3, 4 & 5

open

80487SX

1 & 2, 3 & 4

2 & 3

2 & 3

2 & 3

2 & 3, 4 & 5

open

80486DX

1 & 2, 3 & 4

1 & 2

2 & 3

2 & 3

2 & 3, 4 & 5

open

80486DX2

1 & 2, 3 & 4

1 & 2

2 & 3

2 & 3

2 & 3, 4 & 5

open

Note:The location of JP15 is unknown. Pins designated should be in the closed position