...because we can't all be on the bleeding edge...





486 VESA SYSTEM (VER. 1)

ACER, INC.

486 VESA SYSTEM (VER. 1)

Processor

80486SX/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

128/256KB

BIOS

Unidentified

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (2), floppy drive interface, IDE interface, SCSI connector, parallel port, PS/2 mouse port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

PS/2 mouse port

CN1

IDE interface

CN8

HDD/FDD power connector for EPA

CN2

VGA control connector for EPA

J4

SCSI interface

CN3

Chassis fan power

J9

Parallel port

CN4

Front panel LEDs

J10

Serial port 1

CN5

Auxiliary keyboard/PS/2 mouse

J11

Serial port 2

CN6

IDE interface LED

J12

Floppy drive interface

CN7

32-bit VESA local bus slots

SL1 & SL2

USER CONFIGURABLE SETTINGS

Function

Label

Position

 

Jumper information unavailable

CN9

Unidentified

Password check disabled

JP1

Pins 2 & 3 closed

 

Password check enabled

JP1

Pins 1 & 2 closed

 

Jumper information unavailable

JP2

Unidentified

 

SCSI IRQ select IRQ10

JP3

Pins 1 & 2 closed

 

SCSI IRQ select IRQ11

JP3

Pins 2 & 3 closed

 

SCSI IRQ disabled

JP3

Open

Factory configured - do not alter

JP4

Open

Factory configured - do not alter

JP5

Open

 

SCSI I/O address select 340h - 35Fh

JP6

Open

 

SCSI I/O address select 140h - 15Fh

JP6

Closed

 

Onboard M5105 disabled

JP7

Open

 

Onboard M5105 enabled

JP7

Closed

Parallel port bidirectional enabled

JP8

Closed

 

Parallel port bidirectional disabled

JP8

Open

 

Battery type select internal

JP9

Closed

 

Battery type select external

JP9

Open

 

Reset button disabled

JP23

Open

 

Reset button enabled

JP23

Closed

 

Keylock enabled

JP24

Open

 

Keylock disabled

JP24

Closed

DRAM CONFIGURATION

Size

Bank 0A

Bank 0

Bank 1

Bank 2

Bank 3

4MB

4MB

None

None

None

None

8MB

4MB

None

(1) 1M x 36

None

None

12MB

4MB

None

(1) 1M x 36

(1) 1M x 36

None

16MB (A)

4MB

None

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB (B)

4MB

(1) 4M x 36

None

None

None

20MB

4MB

None

(1) 4M x 36

None

None

24MB

4MB

None

(1) 1M x 36

(1) 4M x 36

None

32MB

4MB

(1) 4M x 36

(1) 4M x 36

None

None

36MB

4MB

None

(1) 4M x 36

(1) 4M x 36

None

40MB

4MB

None

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

48MB

4MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

None

64MB

4MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

Note: If Bank 0 is populated, Bank 0A needs to be disabled with JP15..

DRAM JUMPER CONFIGURATION

Size

JP15

4MB

Pins 2 & 3 closed

8MB

Pins 2 & 3 closed

12MB

Pins 2 & 3 closed

16MB (A)

Pins 2 & 3 closed

16MB (B)

Pins 1 & 2 closed

20MB

Pins 2 & 3 closed

24MB

Pins 2 & 3 closed

32MB

Pins 1 & 2 closed

36MB

Pins 2 & 3 closed

40MB

Pins 2 & 3 closed

48MB

Pins 1 & 2 closed

64MB

Pins 1 & 2 closed

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

128KB

(4) 32K x 8

None

(1) 32K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP17

JP20

128KB

Open

Pins 1 & 2 closed

256KB

Closed

Pins 2 & 3 closed

CPU SPEED SELECTION

Speed

JP10

20MHz

Pins 1 & 6 closed

25MHz

Pins 2 & 7 closed

33MHz

Pins 3 & 8 closed

40MHz

Pins 4 & 9 closed

50iMHz

Pins 2 & 7 closed

50MHz

Pins 5 & 10 closed

66iMHz

Pins 3 & 8 closed

VL BUS WAIT STATE SELECTION

Setting

JP11

0

Open

 

1

Closed