386-20 Motherboard Settings and Configuration

Processor	80386DX
Processor Speed	20MHz
Chip Set	Micronics
Max. Onboard DRAM	8MB (on system memory card)
Cache	16KB (on M100C and M400C system memory cards only)
BIOS	Award/Phoenix
Dimensions	355.6mm x 255.4mm
I/O Options	32-bit system memory card slot
NPU Options	80387/3167

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Speaker	J22
32-bit system memory card power	J11	Turbo LED	W7
32-bit system memory card	J20	Reset switch	W9
Power LED & keylock	J21
Note:The system memory card is inserted into both J11 & J20.

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Factory configured - do not alter	SW1/1	On
	NPU enabled	SW1/2	On
	NPU disabled	SW1/2	Off
»	Factory configured - do not alter	SW1/3	Off
»	Video BIOS shadowing enabled	SW1/4	On
	Video BIOS shadowing disabled	SW1/4	Off
»	Factory configured - do not alter	SW1/5	Off
»	Monitor type select color	SW1/6	On
	Monitor type select monochrome	SW1/6	Off
	Cache enabled	SW1/7	On
	Cache disabled	SW1/7	Off
»	Factory configured - do not alter	SW1/8	Off
	BIOS type select 27128	W1	pins 1 & 2 closed
	BIOS type select 27256	W1	pins 2 & 3 closed
	NPU mode select synchronous with CPU	W4 W6	pins 2 & 3 closed open
	NPU mode select asynchronous with CPU	W4 W6	pins 1 & 2 closed closed
Note:Cache configuration applies to main memory boards M100C and M400C only.

CONNECTIONS
Purpose	Location
32-bit piggy back memory card	S1 & S2

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Jumper W1
1MB	(36) 256K x 1	NONE	pins 2 & 3, 4 & 5, 7 & 8 closed
2MB	(36) 256K x 1	(36) 256K x 1	pins 1 & 2, 4 & 5, 7 & 8 closed

CONNECTIONS
Purpose	Location
32-bit piggy back memory card	S1 & S2

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Jumper W1
4MB	(36) 1M x 1	NONE	pins 1 & 2, 3 & 4 closed
8MB	(36) 1M x 1	(36) 1M x 1	pins 3 & 4 closed

CONNECTIONS
Purpose	Location
32-bit piggy back memory card	S1 & S2

DRAM CONFIGURATION
Size	Bank 0	Parity (P-0)	Bank 1	Parity (P-1)	Bank 2	SW1
1MB	(8) 44256	(4) 4464	NONE	NONE	NONE	switches 5, 6, & 8 closed
2MB	(8) 44256	(4) 4464	(8) 44256	(4) 4464	NONE	switches 3, 5, 6, & 8 closed
6MB	(8) 44256	(4) 4464	(8) 44256	(4) 4464	(36) 411000	switches 2, 3, 5, 6, & 8 closed

CONNECTIONS
Purpose	Location
32-bit piggy back memory card	S1 & S2

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Jumper W1	Jumper W3
1MB	(36) 256K x 1	NONE	pins 1 & 2 closed	closed
2MB	(36) 256K x 1	(36) 256K x 1	pins 2 & 3 closed	closed
Note:Jumper W3 enables cache controller chip. Disabling this jumper will decrease system speed.

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Jumper W1	Jumper W3
4MB	(36) 1M x 1	NONE	pins 1 & 2 closed	closed
8MB	(36) 1M x 1	(36) 1M x 1	pins 2 & 3 closed	closed
Note:Jumper W3 enables cache controller chip. Disabling this jumper will decrease system speed.