80486-25 ISA Motherboard Settings and Configuration

MICRONICS COMPUTERS, INC.

80486-25 ISA

Processor
80486DX
Processor Speed
25MHz
Chip Set
Micronics
Max. Onboard DRAM
16MB
Cache
64/128/256KB
BIOS
Phoenix
Dimensions
350mm 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
»
BIOS select onboard
SW1/2
Off

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

Secondary cache disabled
SW1/4
Off
»
Video BIOS shadowing disabled
SW1/5
Off

Video BIOS shadowing enabled
SW1/5
On
»
Factory configured - do not alter
SW1/6
Off
»
Monitor type select color
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
»
Address range 14MB to 15MB cacheable
SW2/6
Off

Address range 13MB to 15MB Non-cacheable
SW2/6
On
»
Factory configured - do not alter
W1
pins 1 & 2 closed
»
Factory configured - do not alter
W2
pins 2 & 3 closed
»
Video BIOS caching enabled
W3
Open

Video BIOS caching disabled
W3
Closed

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

DRAM SWITCH CONFIGURATION
Size
SW2/1
SW2/2
SW2/3
SW2/4
1MB
On
On
On
On
2MB
Off
On
On
On
3MB
On
Off
On
On
4MB
Off
Off
On
On
4MB
On
On
Off
On
5MB
On
On
Off
Off
6MB
On
Off
On
Off
7MB
Off
On
On
Off
8MB
Off
On
Off
On
9MB
On
Off
Off
Off
10MB
Off
Off
On
Off
12MB
On
Off
Off
On
13MB
Off
Off
Off
Off
16MB
Off
Off
Off
On

CACHE CONFIGURATION
Size
Bank 0
Bank 1
64KB
(4) 8K x 8
(4) 8K x 8
128KB
(4) 32K x 8
NONE
256KB
(4) 32K x 8
(4) 32K x 8

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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80486-25 ISA 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	350mm 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
»	BIOS select onboard	SW1/2	Off
	BIOS select external	SW1/2	On
»	Factory configured - do not alter	SW1/3	On
»	Secondary cache enabled	SW1/4	On
	Secondary cache disabled	SW1/4	Off
»	Video BIOS shadowing disabled	SW1/5	Off
	Video BIOS shadowing enabled	SW1/5	On
»	Factory configured - do not alter	SW1/6	Off
»	Monitor type select color	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
»	Address range 14MB to 15MB cacheable	SW2/6	Off
	Address range 13MB to 15MB Non-cacheable	SW2/6	On
»	Factory configured - do not alter	W1	pins 1 & 2 closed
»	Factory configured - do not alter	W2	pins 2 & 3 closed
»	Video BIOS caching enabled	W3	Open
	Video BIOS caching disabled	W3	Closed

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

DRAM SWITCH CONFIGURATION
Size	SW2/1	SW2/2	SW2/3	SW2/4
1MB	On	On	On	On
2MB	Off	On	On	On
3MB	On	Off	On	On
4MB	Off	Off	On	On
4MB	On	On	Off	On
5MB	On	On	Off	Off
6MB	On	Off	On	Off
7MB	Off	On	On	Off
8MB	Off	On	Off	On
9MB	On	Off	Off	Off
10MB	Off	Off	On	Off
12MB	On	Off	Off	On
13MB	Off	Off	Off	Off
16MB	Off	Off	Off	On

CACHE CONFIGURATION
Size	Bank 0	Bank 1
64KB	(4) 8K x 8	(4) 8K x 8
128KB	(4) 32K x 8	NONE
256KB	(4) 32K x 8	(4) 32K x 8

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