SC386DX Motherboard Settings and Configuration

Processor	80386DX
Processor Speed	33MHz
Chip Set	OPTI
Max. Onboard DRAM	32MB
SRAM Cache	32/64/128/256KB
BIOS	Award
Dimensions	350mm x 125mm
I/O Options	Floppy drive interface, IDE interface parallel port, serial port (2), PS/2 keyboard port
NPU Options	80387DX

CONNECTIONS
Purpose	Location	Purpose	Location
Auxiliary keyboard	CN1	Parallel port	CN8
Keylock	CN2	External battery	CN9
Speaker	CN3	Serial port 1	CN10
Reset switch	CN4	Serial port 2	CN11
IDE interface LED	CN5	PS/2 keyboard	CN12
Floppy drive interface	CN6	Power LED	LED
IDE interface	CN7	Turbo switch	JP3

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Factory configured - do not alter	JP1	closed
»	IDE interface (CN7) enabled	JP9	pins 1 & 2 closed
	IDE interface (CN7) disabled	JP9	pins2 & 3 closed
»	Parallel port (CN8) select LPT2 (I/O address 378-37Fh)	JP12	pins 1 & 2 closed
	Parallel port (CN8) select LPT3 (I/O address 278-27Fh)	JP12	pins 2 & 3 closed
»	Monitor type select color	JP13	closed
	Monitor type select monochrome	JP13	open
»	Floppy drive interface (CN6) enabled	JP14	pins 1 & 2 closed
	Floppy drive interface (CN6) disabled	JP14	pins 2 & 3 closed
»	Parallel port (CN8) interrupt select IRQ7 (LPT2)	JP15	pins 1 & 2 closed
	Parallel port (CN8) interrupt select IRQ5 (LPT3)	JP15	pins 2 & 3 closed
»	Watchdog Timer interval select 500ms	JP16	closed
	Watchdog Timer interval select 1 second	JP16	open
»	Watchdog Timer mode select system reset after time-out	JP17	pins 1 & 2 closed
	Watchdog Timer mode select low IOCHK# NMI after time-out	JP17	pins 2 & 3 closed
	Watchdog Timer mode select disabled	JP17	open
»	CMOS memory normal operation	JP18	pins 1 & 2 closed
	CMOS memory clear	JP18	pins 2 & 3 closed
»	Parallel port (CN8) enabled	JP21	pins 1 & 2 closed
	Parallel port (CN8) disabled	JP21	pins 2 & 3 closed

SERIAL PORT CONFIGURATION
Function		Jumper	Position
»	Serial port 1 (CN10) enabled	JP23	pins 1 & 2 closed
	Serial port 1 (CN10) disabled	JP23	pins 2 & 3 closed
»	Serial port 1 (CN10) select COM1 (I/O address 3F8-3FFh)	JP22	pins 1 & 2 closed
	Serial port 1 (CN10) select COM3 (I/O address 3E8-3EFh)	JP22	pins 2 & 3 closed
»	Serial port 1 (CN10) interrupt select IRQ4	JP11	pins 1 & 2 closed
	Serial port 1 (CN10) interrupt select IRQ3	JP11	pins 2 & 3 closed
»	Serial port 2 (CN11) enabled	JP20	pins 1 & 2 closed
	Serial port 2 (CN11) disabled	JP20	pins 2 & 3 closed
»	Serial port 2 (CN11) select COM2 (I/O address 2F8-2FFh)	JP19	pins 1 & 2 closed
	Serial port 2 (CN11) select COM4 (I/O address 2E8-2EFh)	JP19	pins 2 & 3 closed
»	Serial port 2 (CN11) interrupt select IRQ3	JP10	pins 1 & 2 closed
	Serial port 2 (CN11) interrupt select IRQ4	JP10	pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(4) 256K x 9	NONE
2MB	(4) 256K x 9	(4) 256K x 9
4MB	(4) 1M x 9	NONE
5MB	(4) 256K x 9	(4) 1M x 9
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE
20MB	(4) 4M x 9	(4) 1M x 9
20MB	(4) 1M x 9	(4) 4M x 9
32MB	(4) 4M x 9	(4) 4M x 9

SRAM CONFIGURATION
Size	Cacheable Memory	Cache SRAM	Location	TAG
32KB	8MB maximum	(4) 8K x 8	Bank 0	(1) 8K x 8
64KB	16MB maximum	(8) 8K x 8	Banks 0 & 1	(2) 8K x 8
128KB	32MB maximum	(4) 32K x 8	Bank 0	(1) 32K x 8
256KB	64MB maximum	(8) 32K x 8	Banks 0 & 1	(2) 32K x 8

SRAM JUMPER CONFIGURATION
Size	JP2	JP4	JP5	JP6	JP7	JP8
32KB	open	pins 1 & 2	open	pins 1 & 2	open	pins 2 & 3
64KB	open	pins 1 & 2	pins 1 & 2	pins 2 & 3	pins 2 & 3	pins 1 & 2
128KB	pins 1 & 2	pins 2 & 3	pins 1 & 2	pins 2 & 3	pins 2 & 3	pins 1 & 2
256KB	pins 1 & 2	pins 2 & 3	pins 2 & 3	pins 2 & 3	pins 1 & 2	pins 1 & 2
Note:Pins designated should be in the closed position.