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STEP PLUS 486 (EV-18216)

EVEREX SYSTEMS, INC.

STEP PLUS 486 (EV-18216)

Processor

80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive

Processor Speed

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

Chip Set

Unidentified

Max. Onboard DRAM

64MB

Cache

64/128/256KB

BIOS

Unidentified

Dimensions

330mm x 218mm

I/O Options

Floppy drive interface, IDE interface, SCSI connector, parallel port, serial ports (2), VGA port, microphone port, LAN port, CD-ROM auxiliary in, riser slot

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

LAN port

CN1

Power LED

J4

Serial port 2

CN2

IDE interface LED

J5

Parallel port

CN3

Keylock

J6

Microphone port

CN4

Speaker

J7

Speaker port

CN5

IDE interface

J9

Serial port 1

CN6

SCSI interface

J10

Floppy drive interface

CN7

CD-ROM auxiliary in

J14

Speaker button

J1

VGA port

J15

Reset switch

J2

Riser slot

SL1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

CMOS memory normal operation

JP5

Open

 

CMOS memory clear

JP5

Closed

»

On board VGA IRQ9 disabled

JP8

Open

 

On board VGA IRQ9 enabled

JP8

Closed

»

IDE interface enabled

JP9

Closed

 

IDE interface disabled

JP9

Open

»

SCSI IRQ select IRQ12

JP12

pins 2 & 3 closed

 

SCSI IRQ select IRQ10

JP12

pins 1 & 2 closed

»

Parallel port IRQ select IRQ7

JP14

pins 1 & 2 closed

 

Parallel port IRQ select IRQ5

JP14

pins 2 & 3 closed

»

Flash BIOS normal mode

SW1

On

 

Flash BIOS programming mode

SW1

Off

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

NONE

NONE

NONE

2MB

(1) 512K x 36

NONE

NONE

NONE

3MB

(1) 512K x 36

(1) 256K x 36

NONE

NONE

4MB

(1) 512K x 36

(1) 512K x 36

NONE

NONE

4MB

(1) 1M x 36

NONE

NONE

NONE

5MB

(1) 512K x 36

(1) 512K x 36

(1) 256K x 36

NONE

6MB

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

NONE

6MB

(1) 512K x 36

(1) 1M x 36

NONE

NONE

7MB

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

(1) 256K x 36

8MB

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

8MB

(1) 2M x 36

NONE

NONE

NONE

8MB

(1) 512K x 36

(1) 512K x 36

(1) 1M x 36

NONE

10MB

(1) 512K x 36

(1) 2M x 36

NONE

NONE

10MB

(1) 512K x 36

(1) 1M x 36

(1) 1M x 36

NONE

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

NONE

12MB

(1) 1M x 36

(1) 2M x 36

NONE

NONE

12MB

(1) 512K x 36

(1) 512K x 36

(1) 2M x 36

NONE

12MB

(1) 512K x 36

(1) 512K x 36

(1) 2M x 36

NONE

14MB

(1) 512K x 36

(1) 1M x 36

(1) 2M x 36

NONE

16MB

(1) 2M x 36

(1) 2M x 36

NONE

NONE

16MB

(1) 1M x 36

(1) 1M x 36

(1) 2M x 36

NONE

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

NONE

NONE

NONE

18MB

(1) 512K x 36

(1) 2M x 36

(1) 2M x 36

NONE

20MB

(1) 1M x 36

(1) 4M x 36

NONE

(1) 2M x 36

20MB

(1) 1M x 36

(1) 2M x 36

(1) 2M x 36

NONE

DRAM CONFIGURATION (CON’T)

Size

Bank 0

Bank 1

Bank 2

Bank 3

20MB

(1) 1M x 36

(1) 1M x 36

(1) 2M x 36

(1) 1M x 36

24MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

NONE

26MB

(1) 512K x 36

(1) 2M x 36

(1) 2M x 36

NONE

28MB

(1) 1M x 36

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

32MB

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

32MB

(1) 2M x 36

(1) 2M x 36

(1) 4M x 36

NONE

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

40MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

48MB

(1) 2M x 36

(1) 2M x 36

(1) 4M x 36

(1) 4M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

NONE

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 32K x 8

128KB

(4) 32K x 8

NONE

(1) 32K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP3

JP4

64KB

pins 3 & 5, 4 & 6 closed

Open

128KB

pins 3 & 5, 4 & 6 closed

pins 1 & 3, 2 & 4 closed

256KB

pins 1 & 3, 2 & 4 closed

pins 1 & 2, 3 & 4, 5 & 6 closed

CPU TYPE CONFIGURATION

Type

JP10

80486SX

pins 1 & 3, 2 & 4, 8 & 9 closed

80487SX

pins 3 & 5 closed

80486DX

pins 1 & 3, 4 & 6, 8 & 9 closed

80486DX2

pins 1 & 3, 4 & 6, 8 & 9 closed

Pentium Overdrive

pins 1 & 3, 2 & 4, 7 & 8, 9 & 10 closed

CPU SPEED CONFIGURATION

Speed

JP7

25MHz

pins 1 & 2, 3 & 4 closed

33MHz

pins 3 & 4 closed

40MHz

pins 1 & 2 closed

50iMHz

pins 1 & 2, 3 & 4 closed

50MHz

Open

66iMHz

pins 3 & 4 closed

VESA WAIT STATE CONFIGURATION

Wait states

JP6

0 wait states

pins 4 & 6 closed

1 wait state

pins 2 & 4 closed

BUS SPEED CONFIGURATION

CPU speed

JP6

<= 33MHz

pins 3 & 5 closed

> 33MHz

pins 1 & 3 closed

VRAM CONFIGURATION

Size

Bank 0

Bank 1

512KB

(8) 44256

NONE

1MB

(8) 44256

(8) 44256

VESA VIDEO CONFIGURATION

Setting

JP17

Enabled

pins 1 & 2 closed

Disabled

pins 2 & 3 closed

VIDEO CONFIGURATION (86C08051 ONLY)

Setting

JP17

1NS

pins 10 & 11, 13 & 14 closed

2NS

pins 11 & 12, 13 & 14 closed

3NS

pins 10 & 11, 14 & 15 closed

4NS

pins 11 & 12, 14 & 15 closed

VIDEO FREQUENCY CONFIGURATION

Size

JP17

43Hz

pins 5 & 6, 8 & 9 closed

56Hz

pins 4 & 5, 8 & 9 closed

60Hz

pins 5 & 6, 8 & 9 closed

70Hz

pins 4 & 5, 7 & 8 closed

72Hz

pins 4 & 5, 7 & 8 closed

LRDY DELAY CONFIGURATION

Type

JP1

JP2

None

pins 5 & 6 closed

Open

2 gate

pins 3 & 4 closed

Open

1 CLK

pins 1 & 2 closed

pins 2 & 3 closed

2 CLK

pins 1 & 2 closed

pins 1 & 2 closed

IDE SPEED CONFIGURATION

Speed

JP11

0

pins 3 & 5, 4 & 6 closed

1

pins 1 & 3, 4 & 6 closed

2

pins 3 & 5, 2 & 4 closed

3

pins 1 & 3, 2 & 4 closed