486/25 Motherboard Settings and Configuration

MICRONICS COMPUTERS, INC.

486/25

Processor
80486DX
Processor Speed
25MHz
Chip Set
Micronics
Max. Onboard DRAM
16MB
Cache
64/128/256KB
BIOS
Phoenix
Dimensions
355mm x 304mm
I/O Options
None
NPU Options
4167

CONNECTIONS
Purpose
Location
Purpose
Location
External battery
J2
Reset switch
W4
Speaker
J22
Turbo LED
W5
Power LED & keylock
J23
Turbo switch
W6

USER CONFIGURABLE SETTINGS
Function
Jumper/Switch
Position
»
Internal cache enabled
SW1/1
On

Internal cache disabled
SW1/1
Off
»
On board BIOS enabled
SW1/2
Off

External BIOS enabled
SW1/2
On
»
Factory configured - do not alter
SW1/3
On
»
External cache enabled
SW1/4
On

External cache disabled
SW1/4
Off
»
BIOS relocation disabled
SW1/5
Off

BIOS relocation enabled
SW1/5
On
»
Factory configured - do not alter
SW1/6
Off
»
Monitor type select color, CGA, EGA, or VGA
SW1/7
On

Monitor type select monochrome
SW1/7
Off
»
Factory configured - do not alter
SW1/8
Off
»
Factory configured - do not alter
SW2/5
Off
»
D00000-EFFFFF cacheable
SW2/6
Off

D00000-EFFFFF non-cacheable
SW2/6
On
»
Factory configured - do not alter
W1
N/A
»
Factory configured - do not alter
W2
pins 2 & 3 closed
»
Factory configured - do not alter
W3
N/A
Note:The exact location of W2 is unknown.

DRAM CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
Bank 3
SW1/1
SW1/2
SW1/3
SW1/4
1MB
(4)256K x 9
NONE
NONE
NONE
On
On
On
On
2MB
(4)256K x 9
(4)256K x 9
NONE
NONE
Off
On
On
On
3MB
(4)256K x 9
(4)256K x 9
(4)256K x 9
NONE
On
Off
On
On
4MB
(4)256K x 9
(4)256K x 9
(4)256K x 9
(4)256K x 9
Off
Off
On
On
4MB
(4)1M x 9
NONE
NONE
NONE
On
On
Off
On
5MB
(4)256K x 9
(4)1M x 9
NONE
NONE
On
On
Off
Off
6MB
(4)256K x 9
(4)256K x 9
(4)1M x 9
NONE
On
Off
On
Off
7MB
(4)256K x 9
(4)256K x 9
(4)256K x 9
(4)1M x 9
Off
On
On
Off
8MB
(4)1M x 9
(4)1M x 9
NONE
NONE
Off
On
Off
On
9MB
(4)256K x 9
(4)1M x 9
(4)1M x 9
NONE
On
Off
Off
Off
10MB
(4)256K x 9
(4)256K x 9
(4)1M x 9
(4) 1M x 9
Off
Off
On
Off
12MB
(4)1M x 9
(4)1M x 9
(4)1M x 9
NONE
On
Off
Off
On
13MB
(4)256K x 9
(4)1M x 9
(4)1M x 9
(4)1M x 9
Off
Off
Off
Off
16MB
(4)1M x 9
(4)1M x 9
(4)1M x 9
(4)1M x 9
Off
Off
Off
On

CACHE CONFIGURATION
Size
Bank 0
Bank 1
TAG
64KB
(4) 8K x 8
(4) 8K x 8
(1) 32K x 8
128KB
(4) 32K x 8
NONE
(1) 32K x 8
256KB
(4) 32K x 8
(4) 32K x 8
(1) 32K x 8
Note:The exact location of the TAG chip is unknown.

CACHE JUMPER CONFIGURATION
Size
SW2/7
SW2/8
W8
W9
64KB
Off
Off
pins 1 & 2 closed
pins 1 & 2 closed
128KB
On
On
pins 2 & 3 closed
pins 1 & 2 closed
256KB
Off
On
pins 2 & 3 closed
pins 2 & 3 closed

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486/25 Motherboard Settings and Configuration

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Processor	80486DX
Processor Speed	25MHz
Chip Set	Micronics
Max. Onboard DRAM	16MB
Cache	64/128/256KB
BIOS	Phoenix
Dimensions	355mm x 304mm
I/O Options	None
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J2	Reset switch	W4
Speaker	J22	Turbo LED	W5
Power LED & keylock	J23	Turbo switch	W6

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Internal cache enabled	SW1/1	On
	Internal cache disabled	SW1/1	Off
»	On board BIOS enabled	SW1/2	Off
	External BIOS enabled	SW1/2	On
»	Factory configured - do not alter	SW1/3	On
»	External cache enabled	SW1/4	On
	External cache disabled	SW1/4	Off
»	BIOS relocation disabled	SW1/5	Off
	BIOS relocation enabled	SW1/5	On
»	Factory configured - do not alter	SW1/6	Off
»	Monitor type select color, CGA, EGA, or VGA	SW1/7	On
	Monitor type select monochrome	SW1/7	Off
»	Factory configured - do not alter	SW1/8	Off
»	Factory configured - do not alter	SW2/5	Off
»	D00000-EFFFFF cacheable	SW2/6	Off
	D00000-EFFFFF non-cacheable	SW2/6	On
»	Factory configured - do not alter	W1	N/A
»	Factory configured - do not alter	W2	pins 2 & 3 closed
»	Factory configured - do not alter	W3	N/A
Note:The exact location of W2 is unknown.

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3	SW1/1	SW1/2	SW1/3	SW1/4
1MB	(4)256K x 9	NONE	NONE	NONE	On	On	On	On
2MB	(4)256K x 9	(4)256K x 9	NONE	NONE	Off	On	On	On
3MB	(4)256K x 9	(4)256K x 9	(4)256K x 9	NONE	On	Off	On	On
4MB	(4)256K x 9	(4)256K x 9	(4)256K x 9	(4)256K x 9	Off	Off	On	On
4MB	(4)1M x 9	NONE	NONE	NONE	On	On	Off	On
5MB	(4)256K x 9	(4)1M x 9	NONE	NONE	On	On	Off	Off
6MB	(4)256K x 9	(4)256K x 9	(4)1M x 9	NONE	On	Off	On	Off
7MB	(4)256K x 9	(4)256K x 9	(4)256K x 9	(4)1M x 9	Off	On	On	Off
8MB	(4)1M x 9	(4)1M x 9	NONE	NONE	Off	On	Off	On
9MB	(4)256K x 9	(4)1M x 9	(4)1M x 9	NONE	On	Off	Off	Off
10MB	(4)256K x 9	(4)256K x 9	(4)1M x 9	(4) 1M x 9	Off	Off	On	Off
12MB	(4)1M x 9	(4)1M x 9	(4)1M x 9	NONE	On	Off	Off	On
13MB	(4)256K x 9	(4)1M x 9	(4)1M x 9	(4)1M x 9	Off	Off	Off	Off
16MB	(4)1M x 9	(4)1M x 9	(4)1M x 9	(4)1M x 9	Off	Off	Off	On

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
64KB	(4) 8K x 8	(4) 8K x 8	(1) 32K x 8
128KB	(4) 32K x 8	NONE	(1) 32K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8
Note:The exact location of the TAG chip is unknown.

CACHE JUMPER CONFIGURATION
Size	SW2/7	SW2/8	W8	W9
64KB	Off	Off	pins 1 & 2 closed	pins 1 & 2 closed
128KB	On	On	pins 2 & 3 closed	pins 1 & 2 closed
256KB	Off	On	pins 2 & 3 closed	pins 2 & 3 closed