MINI 486 SYSTEM BOARD Motherboard Settings and Configuration

MICRONICS COMPUTERS, INC.

MINI 486 SYSTEM BOARD

Processor
80486SX/80486DX/ODP486SX/80486DX2
Processor Speed
25/33/50(internal)/50/66(internal)MHz
Chip Set
Micronics
Max. Onboard DRAM
64MB
Cache
64/128/256KB
BIOS
Phoenix
Dimensions
230mm x 218mm
I/O Options
None
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
External keyboard connector
J1
Turbo switch
W16
Speaker
J20
Turbo LED
W17
Reset switch
W15
Power LED & keylock
W18

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Monitor type select color
W2
Closed

Monitor type select monochrome
W2
Open
»
Real Time Clock enabled
W3
pins 1 & 2 closed

External battery enabled
W3
pins 2 & 3 closed
»
Factory configured - do not alter
W43
pins 1 & 2 closed

DRAM CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
Bank 3
1MB
(1) 256K x 36
NONE
NONE
NONE
2MB
(1) 256K x 36
(1) 256K x 36
NONE
NONE
4MB
(1) 1M x 36
NONE
NONE
NONE
6MB
(1) 256K x 36
(1) 256K x 36
(1) 1M x 36
NONE
8MB
(1) 1M x 36
(1) 1M x 36
NONE
NONE
10MB
(1) 256K x 36
(1) 256K x 36
(1) 1M x 36
(1) 1M x 36
12MB
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
NONE
16MB
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
16MB
(1) 4M x 36
NONE
NONE
NONE
18MB
(1) 256K x 36
(1) 256K x 36
(1) 4M x 36
NONE
20MB
(1) 1M x 36
(1) 4M x 36
NONE
NONE
24MB
(1) 1M x 36
(1) 1M x 36
(1) 4M x 36
NONE
32MB
(1) 4M x 36
(1) 4M x 36
NONE
NONE
36MB
(1) 1M x 36
(1) 4M x 36
(1) 4M x 36
NONE
40MB
(1) 1M x 36
(1) 1M x 36
(1) 4M x 36
(1) 4M x 36
48MB
(1) 4M x 36
(1) 4M x 9
(1) 4M x 36
NONE
64MB
(1) 4M x 36
(1) 4M x 9
(1) 4M x 36
(1) 4M x 36

CACHE CONFIGURATION
Size
Bank 0
Bank 1
TAG/U41
TAG/U42
64KB
(4) 8K x 8
(4) 8K x 8
(1) 8K x 8
N/A
128KB
(4) 32K x 8
NONE
(1) 32K x 8
N/A
256KB
(4) 32K x 8
(4) 32K x 8
(1) 32K x 8
N/A
Note:Tag/U42 is not currently in use.

CACHE JUMPER CONFIGURATION
Size
W5
W6
W7
W8
W9
W10
W11
W12
W13
64KB
2 & 3
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
1 & 2
2 & 3
2 & 3
128KB
2 & 3
2 & 3
1 & 2
2 & 3
2 & 3
1 & 2
2 & 3
1 & 2
1 & 2
256KB
2 & 3
2 & 3
2 & 3
2 & 3
2 & 3
2 & 3
2 & 3
2 & 3
2 & 3
Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type
W14
W19
80486SX
N/A
pins 1 & 2 closed
80486DX
pins 2 & 3 closed
pins 2 & 3 closed
ODP486SX
pins 1 & 2 closed
pins 2 & 3 closed
80486DX2
pins 2 & 3 closed
pins 2 & 3 closed

CPU SPEED CONFIGURATION
Speed
W21
W22
25MHz
pins 2 & 3 closed
pins 2 & 3 closed
33MHz
pins 1 & 2 closed
pins 2 & 3 closed
50i MHz
pins 2 & 3 closed
pins 2 & 3 closed
50MHz
pins 1 & 2 closed
pins 1 & 2 closed
66i MHz
pins 1 & 2 closed
pins 2 & 3 closed

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MINI 486 SYSTEM BOARD Motherboard Settings and Configuration

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Processor	80486SX/80486DX/ODP486SX/80486DX2
Processor Speed	25/33/50(internal)/50/66(internal)MHz
Chip Set	Micronics
Max. Onboard DRAM	64MB
Cache	64/128/256KB
BIOS	Phoenix
Dimensions	230mm x 218mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External keyboard connector	J1	Turbo switch	W16
Speaker	J20	Turbo LED	W17
Reset switch	W15	Power LED & keylock	W18

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select color	W2	Closed
	Monitor type select monochrome	W2	Open
»	Real Time Clock enabled	W3	pins 1 & 2 closed
	External battery enabled	W3	pins 2 & 3 closed
»	Factory configured - do not alter	W43	pins 1 & 2 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(1) 256K x 36	NONE	NONE	NONE
2MB	(1) 256K x 36	(1) 256K x 36	NONE	NONE
4MB	(1) 1M x 36	NONE	NONE	NONE
6MB	(1) 256K x 36	(1) 256K x 36	(1) 1M x 36	NONE
8MB	(1) 1M x 36	(1) 1M x 36	NONE	NONE
10MB	(1) 256K x 36	(1) 256K x 36	(1) 1M x 36	(1) 1M x 36
12MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	NONE
16MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
16MB	(1) 4M x 36	NONE	NONE	NONE
18MB	(1) 256K x 36	(1) 256K x 36	(1) 4M x 36	NONE
20MB	(1) 1M x 36	(1) 4M x 36	NONE	NONE
24MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	NONE
32MB	(1) 4M x 36	(1) 4M x 36	NONE	NONE
36MB	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36	NONE
40MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36
48MB	(1) 4M x 36	(1) 4M x 9	(1) 4M x 36	NONE
64MB	(1) 4M x 36	(1) 4M x 9	(1) 4M x 36	(1) 4M x 36

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG/U41	TAG/U42
64KB	(4) 8K x 8	(4) 8K x 8	(1) 8K x 8	N/A
128KB	(4) 32K x 8	NONE	(1) 32K x 8	N/A
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8	N/A
Note:Tag/U42 is not currently in use.

CACHE JUMPER CONFIGURATION
Size	W5	W6	W7	W8	W9	W10	W11	W12	W13
64KB	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2	1 & 2	1 & 2	2 & 3	2 & 3
128KB	2 & 3	2 & 3	1 & 2	2 & 3	2 & 3	1 & 2	2 & 3	1 & 2	1 & 2
256KB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	W14	W19
80486SX	N/A	pins 1 & 2 closed
80486DX	pins 2 & 3 closed	pins 2 & 3 closed
ODP486SX	pins 1 & 2 closed	pins 2 & 3 closed
80486DX2	pins 2 & 3 closed	pins 2 & 3 closed

CPU SPEED CONFIGURATION
Speed	W21	W22
25MHz	pins 2 & 3 closed	pins 2 & 3 closed
33MHz	pins 1 & 2 closed	pins 2 & 3 closed
50i MHz	pins 2 & 3 closed	pins 2 & 3 closed
50MHz	pins 1 & 2 closed	pins 1 & 2 closed
66i MHz	pins 1 & 2 closed	pins 2 & 3 closed