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4820ST/T (250-5140)

TANDY/RADIO SHACK

4820ST/T (250-5140)

Processor

80486SX/80487SX/ODP486/ODPR486/80486DX/80486DX2

Processor Speed

20/25/33/40/50(internal)/50/66(internal)MHz

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

64MB

Maximum Video Memory

None

Cache

None

BIOS

Unidentified

Dimensions

330mm x 218mm

I/O Options

Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2)

NPU Options

80487SX

CONNECTIONS

Purpose

Location

Purpose

Location

PS/2 mouse port

CN1

IDE interface

CN6

Serial port 1

CN2

Power indicator

J1

Serial port 2

CN3

IDE interface LED

J2

Parallel port

CN4

External battery

J3

Floppy drive interface

CN5

Front panel connector

J4

USER CONFIGURABLE SETTINGS

Function

Label

Position

CMOS memory normal operation

JP1

Open

 

CMOS memory clear

JP1

Closed

Monitor type select color

SW1/3

On

 

Monitor type select monochrome

SW1/3

Off

Factory configured - do not alter

SW1/4

Unidentified

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(4) 256K x 9

None

None

None

2MB

(4) 256K x 9

(4) 256K x 9

None

None

3MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

None

4MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

None

None

None

5MB

(4) 256K x 9

(4) 1M x 9

None

None

6MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

None

8MB

(4) 1M x 9

(4) 1M x 9

None

None

9MB

(4) 1M x 9

(4) 1M x 9

(4) 256K x 9

None

10MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

12MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

None

16MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

None

None

None

17MB

(4) 256K x 9

(4) 4M x 9

None

None

18MB

(4) 256K x 9

(4) 256K x 9

(4) 4M x 9

None

20MB

(4) 1M x 9

(4) 4M x 9

None

None

24MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

None

32MB

(4) 4M x 9

(4) 4M x 9

None

None

33MB

(4) 4M x 9

(4) 4M x 9

(4) 256K x 9

None

34MB

(4) 256K x 9

(4) 256K x 9

(4) 4M x 9

(4) 4M x 9

36MB

(4) 4M x 9

(4) 4M x 9

(4) 1M x 9

None

40MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

48MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

None

64MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

CPU TYPE SELECTION

Type

Socket

SW1/1

SW1/2

80486SX

CPU

Off

Off

ODP486

CPU

On

On

ODP486

NPU

Off

Off

ODPR486

CPU

On

Off

80487SX

CPU

On

On

80487SX

NPU

Off

Off

80486DX

CPU

On

Off

80486DX2

CPU

On

Off