Compaq Deskpro 386s/20

Description

The Compaq Deskpro 386s/20 is a PC compatible desktop based on the intel 80386 SX processor. It was introduced as a mid-level model for around $3500-4500 and was produced until sometime in 1992.

Technical Details

The Compaq Deskpro 386s/20 was a 20 MHz update on the original 386s, which was 16MHz originally. The main QOL improvement, besides the 9MHz faster clock-speed, is the addition of on-motherboard 72 pin Fast Page SIMM memory rather than relying on the then aging propreitary memory card format introduced with the original Deskpro 386 in 1986.

Specifications

• Intel 80386 SX-20 CPU
• Up to 16MB of RAM on 3x 72-pin SIMMS
• 20Mhz Intel 80387 SX math co-processor (optional)
• Dallas RTC
• Choice of 1.44MB 3.5", 1.2MB 5.25", or both Slimline floppy drives
• Hard Disk Drives ranging from 80MB to 320MB (IDE)
• Compaq VGA Graphics
• Internal Speaker Sound

A nifty feature on this machine, common to a lot of Compaq machines at the time, is the inclusion of keyboard clicks from the internal speaker using the CTRL+ALT with the Plus or Minus key on the numeric keypad to turn the clicker volume up or down.

Jumper Settings (Model 001421)

Processor	80386SX
Processor Speed	20MHz
Chip Set	Compaq
Max. Onboard DRAM	16MB
Cache	None
BIOS	Compaq
Dimensions	332mm x 333mm
I/O Options	VGA feature connector, floppy drive interface, IDE interface, parallel port, serial port, VGA port, bus mouse
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
Bus mouse port	CN1	IDE interface	IDE
Parallel port	CN2	VGA feature connector	VGA
Serial port	CN3	Main power	P0
VGA port	CN4	Drive power plugs	P1-P4
Fan power	FAN	Speaker	SPK
3.5 inch floppy drive interface	FD1	5.25 inch floppy drive interface	FD2

USER CONFIGURABLE SETTINGS
Function		Switch	Position
»	VGA port enabled	SW1/1	On
	VGA port disabled	SW1/1	Off
»	Password enabled	SW1/2	Off
	Password disabled	SW1/2	On

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	1M x 9	NONE	NONE	NONE
2MB	1M x 9	1M x 9	NONE	NONE
2MB	2M x 9	NONE	NONE	NONE
3MB	1M x 9	1M x 9	1M x 9	NONE
4MB	1M x 9	1M x 9	1M x 9	1M x 9
4MB	2M x 9	2M x 9	NONE	NONE
4MB	4M x 9	NONE	NONE	NONE
6MB	2M x 9	2M x 9	2M x 9	NONE
8MB	2M x 9	2M x 9	2M x 9	2M x 9
8MB	4M x 9	4M x 9	NONE	NONE
12MB	4M x 9	4M x 9	4M x 9	NONE
16MB	4M x 9	4M x 9	4M x 9	4M x 9

Jumper Settings (Model 002040)

Processor	80386SX
Processor Speed	20MHz
Chip Set	Compaq
Max. Onboard DRAM	16MB
Cache	None
BIOS	Compaq
Dimensions	332mm x 333mm
I/O Options	VGA feature connector, floppy drive interface, IDE interface, parallel port, serial port, VGA port, bus mouse
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
Bus mouse port	CN1	IDE interface	IDE
Parallel port	CN2	VGA feature connector	VGA
Serial port	CN3	Main power	P0
VGA port	CN4	Drive power plugs	P1-P4
Fan power	FAN	Speaker	SPK
3.5 inch floppy drive interface	FD1	5.25 inch floppy drive interface	FD2

USER CONFIGURABLE SETTINGS
Function		SW1	Position
»	VGA port enabled	SW1/1	On
	VGA port disabled	SW1/1	On
»	ROM resident setup enabled	SW1/2	On
	ROM resident setup disabled	SW1/2	Off
»	External boot enabled	SW1/3	On
	External boot disabled	SW1/3	Off
»	Password enabled	SW1/4	On
	Password disabled	SW1/4	Off
»	Factory configured - do not alter	SW1/5	Off
»	Floppy drive read/write enabled	SW1/6	On
	Floppy drive read/write disabled	SW1/6	Off

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	1M x 9	NONE	NONE	NONE
2MB	1M x 9	1M x 9	NONE	NONE
2MB	2M x 9	NONE	NONE	NONE
3MB	1M x 9	1M x 9	1M x 9	NONE
4MB	1M x 9	1M x 9	1M x 9	1M x 9
4MB	2M x 9	2M x 9	NONE	NONE
4MB	4M x 9	NONE	NONE	NONE
6MB	2M x 9	2M x 9	2M x 9	NONE
8MB	2M x 9	2M x 9	2M x 9	2M x 9
8MB	4M x 9	4M x 9	NONE	NONE
12MB	4M x 9	4M x 9	4M x 9	NONE
16MB	4M x 9	4M x 9	4M x 9	4M x 9

See Also

• Compaq