Compaq Deskpro 386

Deskpro386.jpg

Description

The Compaq Deskpro 386 was a intel 80386 based desktop computer released by Compaq in 1986 and introduced in 3 clock speeds in this original version. Most seem to be released under the model number 2571 despite the clock-speed, in which it came in 3 different clock speeds. This model was later replaced by the Deskpro 386s/20, 386/20e, and similar models.

Technical Details

This was the last Compaq model to make use of the original Deskpro style chassis and general form factor. Back was the single ribbon cable power supply, 4-power ports on the motherboard, shock-absorbing drive cage, and front-mounted AT keyboard jack of the original.

Specifications

  • Intel 80386 DX CPU in 16Mhz, 20MHz, or 25MHz configurations
  • Support for an 80387 Math Co-Processor (optional) Standard
  • Proprietary Memory board for up to 16MB of RAM using DIP Memory and Daughtercard Expansion Cards
  • Available with 360K, 1.2M, 720K, 1.44M floppy drives (up to two)
  • Available with HDD in capacities ranging from 40MB to 310MB in size
  • Tape Backup Drive available as an option
  • Quadram QuadEGA Graphics, also availible later with VGA
  • Other option boards for Serial/Parallel/Networking also available
  • Originally shipped with Compaq Branded DOS up to version 5.00

The original releases had the smaller silver label that just said "Compaq Deskpro 386" on it. When 20MHz Models became available, a larger logo saying "Compaq Deskpro 386/20" started to appear. Very late builds of the 20 and 25MHz Models have a gray bezel inset instead of a dark blackish-brown one (the gray is not that common), which was around the time Compaq was re-styling the computer for the later s/e/i series models.

Jumper Settings (Type 'A')

Processor

80386DX

Processor Speed

16MHz

Chip Set

ETEQ

Max. Onboard DRAM

2MB (on system memory card)

Cache

None

BIOS

Compaq

Dimensions

330mm x 218mm

I/O Options

Proprietary system memory card slot, proprietary external memory card slot (on system memory card)

NPU Options

80287

 

CONNECTIONS

Purpose

Location

Purpose

Location

Fixed drive power

J109

Proprietary keyboard plug

J116

Tape backup power

J110

Main power

J117

Floppy drive power

J111

External battery

J118

Floppy drive power

J112

Keylock

J119

Monitor power

J113

Proprietary system memory card

S1

Speaker

J115

   

USER CONFIGURABLE SETTINGS

Function

Switch

Position

»

Fail-safe timer enabled

SW1/1

On

 

Fail-safe timer disabled

SW1/1

Off

»

NPU enabled

SW1/2

On

 

NPU disabled

SW1/2

Off

»

NPU type select 4MHz

SW1/3

On

 

NPU type select 8MHz

SW1/3

Off

»

CPU speed at boot automatic

SW1/4

On

»

CPU speed at boot high

SW1/4

Off

»

Factory configured - do not alter

SW1/5

Off

»

Monitor type select dual-mode/color

SW1/6

On

 

Monitor type select monochrome other than Compaq

SW1/6

Off

»

Factory configured - do not alter

SW1/7

On

»

Factory configured - do not alter

SW1/8

On

 

CONNECTIONS

Purpose

Location

Proprietary external memory card

S1 & S2

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(36) 41256

NONE

2MB

(36) 41256

(36) 41256

DRAM CONFIGURATION

Size

Base Memory

Ext. Memory

1MBExp. Memory

J1

1MB

256KB

768KB

disabled

pins 1 & 2, 4 & 5, 7 & 8 closed

1MB

512KB

512KB

disabled

pins 2 & 3, 4 & 5, 7 & 8 closed

1MB

640KB

384KB

disabled

pins 2 & 3, 5 & 6, 7 & 8 closed

2MB

256KB

768KB

enabled

pins 1 & 2, 4 & 5, 8 & 9 closed

2MB

512KB

512KB

enabled

pins 2 & 3, 4 & 5, 8 & 9 closed

2MB

640KB

384KB

enabled

pins 2 & 3, 5 & 6, 8 & 9 closed

Note:Jumpers 3 & 4 and 6 & 7 should never be closed as serious damage to the system may result.

Jumper Settings (Type 'B')

Processor

80386DX

Processor Speed

16MHz

Chip Set

ETEQ

Max. Onboard DRAM

2MB (on system memory card)

Cache

None

BIOS

Compaq

Dimensions

330mm x 218mm

I/O Options

Proprietary system memory card slot, proprietary external memory card slot (on system memory card)

NPU Options

80287/80387

 

CONNECTIONS

Purpose

Location

Purpose

Location

Fixed drive power

J109

Proprietary keyboard plug

J116

Tape backup power

J110

Main power

J117

Floppy drive power

J111

External battery

J118

Floppy drive power

J112

Keylock

J119

Monitor power

J113

Proprietary system memory card

S1

Speaker

J115

   

USER CONFIGURABLE SETTINGS

Function

Switch

Position

»

Fail-safe timer enabled

SW1/1

On

 

Fail-safe timer disabled

SW1/1

Off

»

NPU enabled

SW1/2

On

 

NPU disabled

SW1/2

Off

»

80287 type select 4MHz

SW1/3

On

 

80287 type select 8MHz

SW1/3

Off

»

CPU speed at boot automatic

SW1/4

On

»

CPU speed at boot high

SW1/4

Off

»

Factory configured - do not alter

SW1/5

Off

»

Monitor type select dual-mode/color

SW1/6

On

 

Monitor type select monochrome other than Compaq

SW1/6

Off

»

NPU type select 80287

SW1/7

On

 

NPU type select 80387

SW1/7

Off

»

Factory configured - do not alter

SW1/8

On

Note:SW1/3 has no effect if SW1/7 is configured for an 80387 NPU.

 

CONNECTIONS

Purpose

Location

Proprietary external memory card

S1 & S2

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(36) 41256

NONE

2MB

(36) 41256

(36) 41256

DRAM JUMPER CONFIGURATION

Size

Base Memory

Exp. Memory

1MBExt. Memory

J1

1MB

256KB

768KB

disabled

pins 1 & 2, 4 & 5, 7 & 8 closed

1MB

512KB

512KB

disabled

pins 2 & 3, 4 & 5, 7 & 8 closed

1MB

640KB

384KB

disabled

pins 2 & 3, 5 & 6, 7 & 8 closed

2MB

256KB

768KB

enabled

pins 1 & 2, 4 & 5, 8 & 9 closed

2MB

512KB

512KB

enabled

pins 2 & 3, 4 & 5, 8 & 9 closed

2MB

640KB

384KB

enabled

pins 2 & 3, 5 & 6, 8 & 9 closed

Note:Jumpers 3 & 4 and 6 & 7 should never be closed as serious damage to the system may result.