LITTLE BOARD/486I Motherboard Settings and Configuration

AMPRO COMPUTERS, INC.

LITTLE BOARD/486I

Processor
80486DX2/80486DX4
Processor Speed
50(internal)/100(internal)MHz
Chip Set
OPTI
Video Chip Set
Unidentified
Maximum Onboard Memory
64MB
Maximum Video Memory
1MB
Cache
None
BIOS
Award
Dimensions
203mm x 146mm
I/O Options
Ethernet 10BaseT connector, AUI connector, floppy drive interface, IDE interface, SCSI-II interface, parallel port, serial ports (4), VGA interface, flat panel connector, external video overlay, LCD bias supply, PC/104 connectors (2), utility/keyboard connector
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
Flat panel connector
J3
Serial port 1 & 2
J11
LCD bias supply
J4
IDE interface
J12
VGA interface
J5
Serial port 3 & 4
J13
External video overlay
J6
Floppy drive interface
J14
Ethernet 10BaseT connector
J7
Parallel port
J15
AUI connector
J8
Utility/keyboard connector
J16
SCSI-II interface
J9
PC/104 connector
P18
DC power
J10
PC/104 connector
P20
Note: Alternate external LAN media are available by means of AUI interface & optional MAUs.

USER CONFIGURABLE SETTINGS
Function
Label
Position

Negative vee enabled
W1
Pins 1 & 2 closed

Negative vee disabled
W1
Pins 2 & 3 closed
»
Factory configured - do not alter
W3
Unidentified
»
Factory configured - do not alter
W8
Unidentified
»
Factory configured - do not alter
W9
Unidentified
»
Factory configured - do not alter
W10
Unidentified
»
Factory configured - do not alter
W11
Unidentified
»
Factory configured - do not alter
W12
Unidentified
»
Factory configured - do not alter
W13
Unidentified
»
Factory configured - do not alter
W16
Unidentified

Watch dog timer select IOCHK
W17
Pins 1 & 2 closed

Watch dog timer select RESET
W17
Pins 2 & 3 closed
»
Factory configured - do not alter
W20
Unidentified
»
Factory configured - do not alter
W22
Unidentified

Low shift clock enabled
W23
Pins 1 & 2 closed

High shift clock enabled
W23
Pins 2 & 3 closed
»
Factory configured - do not alter
W24
Unidentified

DRAM CONFIGURATION
Size
Bank 0
Bank 1
1MB
(1) 256K x 32
None
2MB
(1) 512K x 32
None
2MB
(1) 256K x 32
(1) 256K x 32
4MB
(1) 1M x 32
None
4MB
(1) 512K x 32
(1) 512K x 32
8MB
(1) 2M x 32
None
8MB
(1) 1M x 32
(1) 1M x 32
12MB
(1) 2M x 32
(1) 1M x 32
16MB
(1) 4M x 32
None
17MB
(1) 4M x 32
(1) 256K x 32
18MB
(1) 4M x 32
(1) 512K x 32
20MB
(1) 4M x 32
(1) 1M x 32
24MB
(1) 4M x 32
(1) 2M x 32
32MB
(1) 8M x 32
None
32MB
(1) 8M x 32
(1) 4M x 32
34MB
(1) 8M x 32
(1) 512K x 32
36MB
(1) 8M x 32
(1) 1M x 32
40MB
(1) 8M x 32
(1) 2M x 32
48MB
(1) 8M x 32
(1) 4M x 32
64MB
(1) 8M x 32
(1) 8M x 32

VIDEO MEMORY CONFIGURATION
Note: The location of the 512KB/1MB video memory is unidentified.

DMA CHANNEL SELECTION
Channel
W18
W19
1
Pins 1 & 2 closed
Pins 1 & 2 closed
3
Pins 2 & 3 closed
Pins 2 & 3 closed

SERIAL PORT 1 INTERRUPT SELECTION
IRQ
W4
W6
IRQ4 shared with serial 1
Pins 1 & 2 closed
Open
IRQ4 not shared
Pins 2 & 3 closed
Closed

SERIAL PORT 2 INTERRUPT SELECTION
IRQ
W5
W7
IRQ3 shared with serial 2
Pins 1 & 2 closed
Open
IRQ3 not shared
Pins 2 & 3 closed
Closed

BIOS SELECTION IN S0 & S1 (EPROM)
Type
W2
W14
W15
W21
27C64
Open
2 & 5, 7 & 8, 9 & 12, 10 & 11
2 & 5, 7 & 8, 9 & 12, 10 & 11
2 & 3
27C128
Open
2 & 5, 7 & 8, 9 & 12, 10 & 11
2 & 5, 7 & 8, 9 & 12, 10 & 11
2 & 3
27C256
Open
9 & 12, 14 & 15
9 & 12, 14 & 15
2 & 3
27C512
Open
9 & 12, 10 & 11, 14 & 15
9 & 12, 10 & 11, 14 & 15
2 & 3
27C010
Open
9 & 12, 10 & 11
9 & 12, 10 & 11
2 & 3
27C020
Open
2 & 5, 7 & 8, 9 & 12, 10 & 11
2 & 5, 7 & 8, 9 & 12, 10 & 11
2 & 3
27C040
Open
2 & 5, 4 & 7, 9 & 12, 10 & 11, 13 & 14
2 & 5, 4 & 7, 9 & 12, 10 & 11, 13 & 14
2 & 3
27C080
Open
4 & 7, 5 & 6, 9 & 12, 10 & 11, 13 & 14
4 & 7, 5 & 6, 9 & 12, 10 & 11, 13 & 14
2 & 3
28C64
Open
2 & 5, 7 & 8, 9 & 12, 10 & 11
2 & 5, 7 & 8, 9 & 12, 10 & 11
2 & 3
Note: Pins designated should be in the closed position. W14 controls S0 & W15 controls S1.

BIOS SELECTION IN S0 & S1 (FLASH BIOS)
Type
W2
W14
W15
W21
29C256
Open
8 & 11, 9 & 12, 14 & 15
8 & 11, 9 & 12, 14 & 15
2 & 3
28C256
Open
8 & 9, 11 & 12, 14 & 15
8 & 9, 11 & 12, 14 & 15
2 & 3
29F512
Open
4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
2 & 3
29F010
Open
4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
2 & 3
29F020
Open
4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
2 & 3
29F040
Open
4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
4 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
2 & 3
28F512
Open
2 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
2 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
2 & 3
28F010
Open
2 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
2 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
2 & 3
28F020
Open
2 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
2 & 5, 7 & 8, 9 & 12, 10 & 11, 13 & 14
2 & 3
Note: Pins designated should be in the closed position. W14 controls S0 & W15 controls S1.

BIOS SELECTION IN S0 & S1 (SRAM & NOVRAM)
Type
W2
W14
W15
W21
BQ4013Y
Open
7 & 10, 8 & 9, 11 & 12, 14 & 15
7 & 10, 8 & 9, 11 & 12, 14 & 15
2 & 3
BQ4015Y
Open
4 & 5, 7 & 10, 8 & 9, 11 & 12, 13 & 14
4 & 5, 7 & 10, 8 & 9, 11 & 12, 13 & 14
2 & 3
42356
Open
7 & 10, 8 & 9, 11 & 12, 14 & 15
7 & 10, 8 & 9, 11 & 12, 14 & 15
2 & 3
DS1235Y
Open
7 & 10, 8 & 9, 11 & 12, 14 & 15
7 & 10, 8 & 9, 11 & 12, 14 & 15
2 & 3
DS1650Y
Open
4 & 5, 7 & 10, 8 & 9, 11 & 12, 13 & 14
4 & 5, 7 & 10, 8 & 9, 11 & 12, 13 & 14
2 & 3
628128
Open
7 & 10, 8 & 9, 11 & 12, 14 & 15
7 & 10, 8 & 9, 11 & 12, 14 & 15
2 & 3
628512
Open
4 & 5, 7 & 10, 8 & 9, 11 & 12, 13 & 14
4 & 5, 7 & 10, 8 & 9, 11 & 12, 13 & 14
2 & 3
Note: Pins designated should be in the closed position. W14 controls S0 & W15 controls S1.

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Processor	80486DX2/80486DX4
Processor Speed	50(internal)/100(internal)MHz
Chip Set	OPTI
Video Chip Set	Unidentified
Maximum Onboard Memory	64MB
Maximum Video Memory	1MB
Cache	None
BIOS	Award
Dimensions	203mm x 146mm
I/O Options	Ethernet 10BaseT connector, AUI connector, floppy drive interface, IDE interface, SCSI-II interface, parallel port, serial ports (4), VGA interface, flat panel connector, external video overlay, LCD bias supply, PC/104 connectors (2), utility/keyboard connector
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Flat panel connector	J3	Serial port 1 & 2	J11
LCD bias supply	J4	IDE interface	J12
VGA interface	J5	Serial port 3 & 4	J13
External video overlay	J6	Floppy drive interface	J14
Ethernet 10BaseT connector	J7	Parallel port	J15
AUI connector	J8	Utility/keyboard connector	J16
SCSI-II interface	J9	PC/104 connector	P18
DC power	J10	PC/104 connector	P20
Note: Alternate external LAN media are available by means of AUI interface & optional MAUs.

USER CONFIGURABLE SETTINGS
Function		Label	Position
	Negative vee enabled	W1	Pins 1 & 2 closed
	Negative vee disabled	W1	Pins 2 & 3 closed
»	Factory configured - do not alter	W3	Unidentified
»	Factory configured - do not alter	W8	Unidentified
»	Factory configured - do not alter	W9	Unidentified
»	Factory configured - do not alter	W10	Unidentified
»	Factory configured - do not alter	W11	Unidentified
»	Factory configured - do not alter	W12	Unidentified
»	Factory configured - do not alter	W13	Unidentified
»	Factory configured - do not alter	W16	Unidentified
	Watch dog timer select IOCHK	W17	Pins 1 & 2 closed
	Watch dog timer select RESET	W17	Pins 2 & 3 closed
»	Factory configured - do not alter	W20	Unidentified
»	Factory configured - do not alter	W22	Unidentified
	Low shift clock enabled	W23	Pins 1 & 2 closed
	High shift clock enabled	W23	Pins 2 & 3 closed
»	Factory configured - do not alter	W24	Unidentified

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(1) 256K x 32	None
2MB	(1) 512K x 32	None
2MB	(1) 256K x 32	(1) 256K x 32
4MB	(1) 1M x 32	None
4MB	(1) 512K x 32	(1) 512K x 32
8MB	(1) 2M x 32	None
8MB	(1) 1M x 32	(1) 1M x 32
12MB	(1) 2M x 32	(1) 1M x 32
16MB	(1) 4M x 32	None
17MB	(1) 4M x 32	(1) 256K x 32
18MB	(1) 4M x 32	(1) 512K x 32
20MB	(1) 4M x 32	(1) 1M x 32
24MB	(1) 4M x 32	(1) 2M x 32
32MB	(1) 8M x 32	None
32MB	(1) 8M x 32	(1) 4M x 32
34MB	(1) 8M x 32	(1) 512K x 32
36MB	(1) 8M x 32	(1) 1M x 32
40MB	(1) 8M x 32	(1) 2M x 32
48MB	(1) 8M x 32	(1) 4M x 32
64MB	(1) 8M x 32	(1) 8M x 32

DMA CHANNEL SELECTION
Channel	W18	W19
1	Pins 1 & 2 closed	Pins 1 & 2 closed
3	Pins 2 & 3 closed	Pins 2 & 3 closed

SERIAL PORT 1 INTERRUPT SELECTION
IRQ	W4	W6
IRQ4 shared with serial 1	Pins 1 & 2 closed	Open
IRQ4 not shared	Pins 2 & 3 closed	Closed

SERIAL PORT 2 INTERRUPT SELECTION
IRQ	W5	W7
IRQ3 shared with serial 2	Pins 1 & 2 closed	Open
IRQ3 not shared	Pins 2 & 3 closed	Closed

BIOS SELECTION IN S0 & S1 (EPROM)
Type	W2	W14	W15	W21
27C64	Open	2 & 5, 7 & 8, 9 & 12, 10 & 11	2 & 5, 7 & 8, 9 & 12, 10 & 11	2 & 3
27C128	Open	2 & 5, 7 & 8, 9 & 12, 10 & 11	2 & 5, 7 & 8, 9 & 12, 10 & 11	2 & 3
27C256	Open	9 & 12, 14 & 15	9 & 12, 14 & 15	2 & 3
27C512	Open	9 & 12, 10 & 11, 14 & 15	9 & 12, 10 & 11, 14 & 15	2 & 3
27C010	Open	9 & 12, 10 & 11	9 & 12, 10 & 11	2 & 3
27C020	Open	2 & 5, 7 & 8, 9 & 12, 10 & 11	2 & 5, 7 & 8, 9 & 12, 10 & 11	2 & 3
27C040	Open	2 & 5, 4 & 7, 9 & 12, 10 & 11, 13 & 14	2 & 5, 4 & 7, 9 & 12, 10 & 11, 13 & 14	2 & 3
27C080	Open	4 & 7, 5 & 6, 9 & 12, 10 & 11, 13 & 14	4 & 7, 5 & 6, 9 & 12, 10 & 11, 13 & 14	2 & 3
28C64	Open	2 & 5, 7 & 8, 9 & 12, 10 & 11	2 & 5, 7 & 8, 9 & 12, 10 & 11	2 & 3
Note: Pins designated should be in the closed position. W14 controls S0 & W15 controls S1.