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STO98C

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