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STEP ISA VL (EV-18211)

EVEREX SYSTEMS, INC.

STEP ISA VL (EV-18211)

Processor

80486SX/80487SX/80486DX

Processor Speed

20/25/33/50MHZ

Chip Set

Compaq

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo LED

JP10

External battery

JP17

Speaker

JP11

Turbo switch

JP32

Power LED & keylock

JP13

32-bit VESA Local bus slot

S1

Reset switch

JP15

32-bit VESA Local bus slot

S2

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

Factory configured - do not alter

JP1

Closed

Fast gate A20 normal operation

JP9

pins 2 & 3 closed

 

Fast gate A20 select alternate

JP9

pins 1 & 2 closed

Monitor type select color

JP12

Closed

 

Monitor type select monochrome

JP12

Open

CMOS memory normal operation

JP16

pins 1 & 2 closed

 

CMOS memory clear

JP16

pins 2 & 3 closed

CPU select 2 wait states

JP29

pins 2 & 3 closed

 

CPU select 1 wait state

JP29

pins 1 & 2 closed

LCLK gate select 1 wait state

JP36

pins 1 & 2 closed

 

LCLK gate select 2 wait state

JP36

pins 2 & 3 closed

CPUADS select 0 wait states

JP38

pins 1 & 2 closed

 

CPUADS select 1 wait state

JP38

pins 2 & 3 closed

Factory configured - do not alter

JP100

Open

Factory configured - do not alter

JP101

Open

Factory configured - do not alter

JP102

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) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP6

JP7

JP8

64KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 4 closed

128KB

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

256KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

VESA WAIT STATE/BUS SPEED (ID2 & ID3) CONFIGURATION

CPU speed

Wait states

ID3

ID2

£ 33MHz

0 wait states

Open

Open

> 33MHz

1 wait state

Closed

Closed

CPU SPEED CONFIGURATION

Speed

JP30

20MHz

pins 2 & 3 closed

25MHz

pins 2 & 3 closed

33MHz

pins 1 & 2 closed

50MHz

pins 1 & 2 closed

CPU TYPE CONFIGURATION

Type

JP2

JP3

JP4

JP5

80486SX

pins 1 & 2 closed

Open

Open

Open

80487SX

pins 2 & 3 closed

Closed

pins 1 & 2 closed

Closed

80486DX

pins 2 & 3 closed

Closed

pins 2 & 3 closed

Open