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4825 SX

TANDY/RADIO SHACK

4825 SX

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

Unidentified

Video Chip Set

Unidentified

Maximum Onboard Memory

32MB

Maximum Video Memory

1MB

Cache

None

BIOS

Unidentified

Dimensions

394mm x 381mm

I/O Options

Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port, riser slot

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

VGA port

CN1

IDE interface

CN8

PS/2 mouse port

CN2

External battery

J1

Parallel port

CN3

Speaker

J2

Serial port 2

CN4

Reset switch

J3

Serial port 1

CN5

Power LED

J4

VGA feature connector

CN6

Riser slot

SL1

Floppy drive interface

CN7

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

CMOS memory normal operation

JP1

Open

 

CMOS memory clear

JP1

Closed

Monitor frequency select 31KHz

SW1/5

Off

 

Monitor frequency select 40KHz

SW1/5

On

Monitor type select color

SW2/3

Off

 

Monitor type select monochrome

SW2/3

On

DRAM CONFIGURATION

Size

Bank 0

Bank 1

4MB

(4) 1M x 9

None

5MB

(4) 1M x 9

(4) 256K x 9

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

VIDEO MEMORY CONFIGURATION

Size

Bank 0

Bank 1

512KB

512KB

None

1MB

512KB

512KB

Note: The location of banks 0 & 1 are unidentified. The size of the video memory chips are unidentified.

VIDEO MEMORY SWITCH CONFIGURATION

Size

SW1/6

512KB

On

1MB

Off

CPU TYPE SELECTION

Type

SW2/1

SW2/2

80486SX

Off

Off

80487SX

On

Off

80486DX

Off

Off

80486DX2

Off

Off

VIDEO RESOLUTION SELECTION (800 X 600)

Frequency

SW1/1

SW1/2

56Hz

Off

Off

 

60Hz

Off

On

 

72Hz

On

Off

 

56Hz

On

On

VIDEO RESOLUTION SELECTION (1024 X 768)

Frequency

SW1/3

SW1/4

Interlaced

Off

Off

 

60HZ non-interlaced

Off

On

 

70HZ non-interlaced

On

Off

 

Interlaced

On

On

ON BOARD VIDEO SELECTION

Setting

SW1/7

SW1/8

Enabled

On

Off

 

Disabled

Off

On