486 SYSTEM (V20L) Motherboard Settings and Configuration

ACER, INC.

486 SYSTEM (V20L)

Processor
AM486SX/80486SX/AM486DX/80486DX/CX486DX2/AM486DX2/ 80486DX2/P24D/P24T
Processor Speed
25/33/40/50(internal)/50/66(internal)MHz
Chip Set
Unidentified
Video Chip Set
None
Maximum Onboard Memory
48MB
Maximum Video Memory
None
Cache
128/256/512KB
BIOS
Unidentified
Dimensions
330mm x 218mm
I/O Options
32-bit VESA local bus slot, floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2)
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
Serial port 1
CN1
Power LED & keylock
CN9 pins 1 - 4
Serial port 2
CN2
Reset switch/green PC connector
CN9 pins 7 & 8
Parallel port
CN3
Power LED & keylock
CN10 pins 1 - 5
Floppy drive interface
CN4
Speaker
CN10 pins 7 - 10
IDE interface 1
CN5
Turbo LED
CN10 pins 12 & 13
IDE interface 2
CN6
Turbo switch
CN10 pins 15 - 17
PS/2 mouse port
CN7
Reset switch
CN10 pins 19 & 20
IDE interface LED
CN8
32-bit VESA local bus slots
SL1

USER CONFIGURABLE SETTINGS
Function
Label
Position
»
Password disabled
JP1
Pins 2 & 3 closed

Password enabled
JP1
Pins 1 & 2 closed
»
OEM BIOS enabled
JP2
Pins 2 & 3 closed
»
Factory configured - do not alter
JP2
Pins 1 & 2 closed
»
M5115 I/O enabled
JP8
Pins 1 & 2 closed

M5115 I/O disabled
JP8
Pins 2 & 3 closed

Jumper information unidentified
JP10
Unidentified
»
Local bus IDE I/O address select 0FXH
JP11
Pins 1 & 2 closed

Local bus IDE I/O address select 07XH
JP11
Pins 2 & 3 closed
»
M5213N local bus IDE enabled
JP12
Pins 2 & 3 closed

M5213N local bus IDE disabled
JP12
Pins 1 & 2 closed
»
Reset key enabled
JP23
Pins 1 & 2 closed

Reset key disabled
JP23
Pins 2 & 3 closed
»
Green PC connector enabled
JP24
Pins 2 & 3 closed

Reset switch enabled
JP24
Pins 1 & 2 closed
»
Factory configured - do not alter
JP41
Pins 2 & 3 closed

DRAM CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
4MB
None
None
(1) 1M x 36
8MB
None
(1) 1M x 36
(1) 1M x 36
8MB
None
None
(1) 2M x 36
12MB
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
12MB
(1) 2M x 36
None
(1) 1M x 36
12MB
(1) 1M x 36
None
(1) 2M x 36
12MB
None
(1) 1M x 36
(1) 2M x 36
16MB
None
None
(1) 4M x 36
16MB
(1) 2M x 36
None
(1) 2M x 36
16MB
(1) 1M x 36
(1) 1M x 36
(1) 2M x 36
16MB
(1) 2M x 36
None
(1) 2M x 36

DRAM CONFIGURATION (CON'T)
Size
Bank 0
Bank 1
Bank 2
20MB
None
(1) 4M x 36
(1) 1M x 36
20MB
None
(1) 1M x 36
(1) 4M x 36
24MB
(1) 1M x 36
(1) 4M x 36
(1) 1M x 36
24MB
(1) 1M x 36
(1) 1M x 36
(1) 4M x 36
24MB
(1) 2M x 36
None
(1) 4M x 36
24MB
(1) 2M x 36
None
(1) 4M x 36
24MB
(1) 4M x 36
None
(1) 2M x 36
24MB
None
(1) 4M x 36
(1) 2M x 36
28MB
(1) 4M x 36
(1) 1M x 36
(1) 2M x 36
28MB
(1) 1M x 36
(1) 4M x 36
(1) 2M x 36
32MB
None
(1) 4M x 36
(1) 4M x 36
36MB
(1) 4M x 36
(1) 4M x 36
(1) 1M x 36
36MB
(1) 4M x 36
(1) 1M x 36
(1) 4M x 36
36MB
(1) 1M x 36
(1) 4M x 36
(1) 4M x 36
40MB
(1) 4M x 36
(1) 4M x 36
(1) 2M x 36
48MB
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36

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
512KB
(4) 128K x 8
None
(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size
JP13
JP15
JP16
128KB
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 1 & 2 closed
256KB
Pins 2 & 3 closed
Pins 1 & 2 closed
Pins 2 & 3 closed
512KB
Pins 1 & 2 closed
Pins 1 & 2 closed
Pins 1 & 2 closed

CPU SPEED SELECTION
Speed
JP17
JP21
25MHz
Pins 1 & 5 closed
Pins 2 & 3 closed
33MHz
Pins 2 & 6 closed
Pins 2 & 3 closed
40MHz
Pins 3 & 7 closed
Pins 1 & 2 closed
50iMHz
Pins 1 & 5 closed
Pins 2 & 3 closed
50MHz
Pins 4 & 8 closed
Pins 1 & 2 closed
66iMHz
Pins 2 & 6 closed
Pins 2 & 3 closed

CPU TYPE SELECTION
Type
JP20
JP26
JP27
AM486SX
Pins 1 & 2 closed
Pins 1 & 2 closed
Pins 1 & 2 closed
80486SX
Pins 1 & 2 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
AM486DX
Pins 1 & 2 closed
Pins 1 & 2 closed
Pins 1 & 2 closed
80486DX
Pins 1 & 2 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
CX486DX2
Pins 1 & 2 closed
Pins 2 & 3 closed
Open
AM486DX2
Pins 1 & 2 closed
Pins 1 & 2 closed
Pins 1 & 2 closed
80486DX2
Pins 1 & 2 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
P24D
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
P24T
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed

CPU TYPE SELECTION (CON'T)
Type
JP33
JP34
JP35
JP37
AM486SX
Pins 1 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
80486SX
Pins 1 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
AM486DX
Pins 1 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
80486DX
Pins 1 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
CX486DX2
Pins 2 & 4 closed
Pins 1 & 2 closed
Pins 2 & 3 closed
Pins 1 & 2 closed
AM486DX2
Pins 1 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
80486DX2
Pins 1 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
P24D
Pins 1 & 3 closed
Pins 2 & 3 closed
Pins 1 & 2 closed
Pins 2 & 3 closed
P24T
Pins 1 & 3 closed
Pins 2 & 3 closed
Pins 1 & 2 closed
Pins 2 & 3 closed

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486 SYSTEM (V20L) Motherboard Settings and Configuration

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Processor	AM486SX/80486SX/AM486DX/80486DX/CX486DX2/AM486DX2/ 80486DX2/P24D/P24T
Processor Speed	25/33/40/50(internal)/50/66(internal)MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	48MB
Maximum Video Memory	None
Cache	128/256/512KB
BIOS	Unidentified
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slot, floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Serial port 1	CN1	Power LED & keylock	CN9 pins 1 - 4
Serial port 2	CN2	Reset switch/green PC connector	CN9 pins 7 & 8
Parallel port	CN3	Power LED & keylock	CN10 pins 1 - 5
Floppy drive interface	CN4	Speaker	CN10 pins 7 - 10
IDE interface 1	CN5	Turbo LED	CN10 pins 12 & 13
IDE interface 2	CN6	Turbo switch	CN10 pins 15 - 17
PS/2 mouse port	CN7	Reset switch	CN10 pins 19 & 20
IDE interface LED	CN8	32-bit VESA local bus slots	SL1

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Password disabled	JP1	Pins 2 & 3 closed
	Password enabled	JP1	Pins 1 & 2 closed
»	OEM BIOS enabled	JP2	Pins 2 & 3 closed
»	Factory configured - do not alter	JP2	Pins 1 & 2 closed
»	M5115 I/O enabled	JP8	Pins 1 & 2 closed
	M5115 I/O disabled	JP8	Pins 2 & 3 closed
	Jumper information unidentified	JP10	Unidentified
»	Local bus IDE I/O address select 0FXH	JP11	Pins 1 & 2 closed
	Local bus IDE I/O address select 07XH	JP11	Pins 2 & 3 closed
»	M5213N local bus IDE enabled	JP12	Pins 2 & 3 closed
	M5213N local bus IDE disabled	JP12	Pins 1 & 2 closed
»	Reset key enabled	JP23	Pins 1 & 2 closed
	Reset key disabled	JP23	Pins 2 & 3 closed
»	Green PC connector enabled	JP24	Pins 2 & 3 closed
	Reset switch enabled	JP24	Pins 1 & 2 closed
»	Factory configured - do not alter	JP41	Pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2
4MB	None	None	(1) 1M x 36
8MB	None	(1) 1M x 36	(1) 1M x 36
8MB	None	None	(1) 2M x 36
12MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
12MB	(1) 2M x 36	None	(1) 1M x 36
12MB	(1) 1M x 36	None	(1) 2M x 36
12MB	None	(1) 1M x 36	(1) 2M x 36
16MB	None	None	(1) 4M x 36
16MB	(1) 2M x 36	None	(1) 2M x 36
16MB	(1) 1M x 36	(1) 1M x 36	(1) 2M x 36
16MB	(1) 2M x 36	None	(1) 2M x 36

DRAM CONFIGURATION (CON'T)
Size	Bank 0	Bank 1	Bank 2
20MB	None	(1) 4M x 36	(1) 1M x 36
20MB	None	(1) 1M x 36	(1) 4M x 36
24MB	(1) 1M x 36	(1) 4M x 36	(1) 1M x 36
24MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36
24MB	(1) 2M x 36	None	(1) 4M x 36
24MB	(1) 2M x 36	None	(1) 4M x 36
24MB	(1) 4M x 36	None	(1) 2M x 36
24MB	None	(1) 4M x 36	(1) 2M x 36
28MB	(1) 4M x 36	(1) 1M x 36	(1) 2M x 36
28MB	(1) 1M x 36	(1) 4M x 36	(1) 2M x 36
32MB	None	(1) 4M x 36	(1) 4M x 36
36MB	(1) 4M x 36	(1) 4M x 36	(1) 1M x 36
36MB	(1) 4M x 36	(1) 1M x 36	(1) 4M x 36
36MB	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36
40MB	(1) 4M x 36	(1) 4M x 36	(1) 2M x 36
48MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36

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
512KB	(4) 128K x 8	None	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP13	JP15	JP16
128KB	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 1 & 2 closed
256KB	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed
512KB	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed

CPU SPEED SELECTION
Speed	JP17	JP21
25MHz	Pins 1 & 5 closed	Pins 2 & 3 closed
33MHz	Pins 2 & 6 closed	Pins 2 & 3 closed
40MHz	Pins 3 & 7 closed	Pins 1 & 2 closed
50iMHz	Pins 1 & 5 closed	Pins 2 & 3 closed
50MHz	Pins 4 & 8 closed	Pins 1 & 2 closed
66iMHz	Pins 2 & 6 closed	Pins 2 & 3 closed

CPU TYPE SELECTION
Type	JP20	JP26	JP27
AM486SX	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
80486SX	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
AM486DX	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
80486DX	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
CX486DX2	Pins 1 & 2 closed	Pins 2 & 3 closed	Open
AM486DX2	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
80486DX2	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
P24D	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
P24T	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed

CPU TYPE SELECTION (CON'T)
Type	JP33	JP34	JP35	JP37
AM486SX	Pins 1 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
80486SX	Pins 1 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
AM486DX	Pins 1 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
80486DX	Pins 1 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
CX486DX2	Pins 2 & 4 closed	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 1 & 2 closed
AM486DX2	Pins 1 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
80486DX2	Pins 1 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
P24D	Pins 1 & 3 closed	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed
P24T	Pins 1 & 3 closed	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed