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STEP 386CX

EVEREX SYSTEMS, INC.

STEP 386CX

Processor

80286/80386SX

Processor Speed

Unidentified

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

8MB

Maximum Video Memory

None

Cache

None

BIOS

Unidentified

Dimensions

254mm x 218mm

I/O Options

Parallel port, serial ports (2), Instep Board connector

NPU Options

80287/80387SX

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 1

CN1

Parallel port

CN3

Serial port 2

CN2

Instep Board connector

CN4

USER CONFIGURABLE SETTINGS

Function

Label

Position

 

IDE interface enabled

J4

Open

 

IDE interface disabled

J4

Closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

512KB

(2) 256K x 9

None

None

None

1MB

(2) 256K x 9

(2) 256K x 9

None

None

2MB

(2) 1M x 9

None

None

None

2.5MB

(2) 256K x 9

(2) 1M x 9

None

None

2.5MB

(2) 1M x 9

(2) 256K x 9

None

None

4MB

(2) 1M x 9

(2) 1M x 9

None

None

6MB

(2) 1M x 9

(2) 1M x 9

(2) 1M x 9

None

8MB

(2) 1M x 9

(2) 1M x 9

(2) 1M x 9

(2) 1M x 9

SERIAL PORT 1 INTERRUPT SELECTION

IRQ

JP2

 

IRQ3

Pins 9 & 10 closed

IRQ4

Pins 11 & 12 closed

SERIAL PORT 2 INTERRUPT SELECTION

IRQ

JP2

IRQ3

Pins 5 & 6 closed

 

IRQ4

Pins 7 & 8 closed

PARALLEL PORT INTERRUPT SELECTION

IRQ

JP2

 

IRQ5

Pins 3 & 4 closed

IRQ7

Pins 1 & 2 closed

HANDSHAKE SELECTION (PORT 1)

Setting

JP3

Enabled

1 & 2, 4 & 5, 7 & 8, 10 & 11

Disabled

2 & 3, 5 & 6, 8 & 9, 11 & 12

Note: Pins designated should be in the closed position.

HANDSHAKE SELECTION (PORT 2)

Setting

JP4

Enabled

1 & 2, 4 & 5, 7 & 8, 10 & 11

Disabled

2 & 3, 5 & 6, 8 & 9, 11 & 12

Note: Pins designated should be in the closed position.

DTE/DCE SELECTION (PORT 1)

Setting

JP5

DTE

1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10, 11 & 12

DCE

1 & 3, 2 & 4, 5 & 7, 6 & 8, 9 & 11, 12 & 14

Note: Pins designated should be in the closed position.

DTE/DCE SELECTION (PORT 2)

Setting

JP6

DTE

1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10, 11 & 12

DCE

1 & 3, 2 & 4, 5 & 7, 6 & 8, 9 & 11, 12 & 14

Note: Pins designated should be in the closed position.

MISCELLANEOUS TECHNICAL NOTE

To upgrade to an 80386SX processor, install 80386SX Instep Board at CN4.