M386/25 (BA247, BA255, BA263) Motherboard Settings and Configuration

Processor	80386DX
Processor Speed	25MHz
Chip Set	Unidentified
Maximum Onboard Memory	18MB (8MB on external memory card)
Cache	32KB
BIOS	Unidentified
Dimensions	355mm x 305mm
I/O Options	External memory card, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial port, VGA port
NPU Options	80387DX/3167

CONNECTIONS
Function	Label	Function	Label
PS/2 mouse port	CN1	Floppy drive interface	CN5
Parallel port	CN2	IDE interface	CN6
Serial port	CN3	External memory card	SL1
VGA port	CN4

USER CONFIGURABLE SETTINGS
Setting		Label	Position
»	Factory configured - do not alter	J14	Closed
»	CMOS memory normal operation	J27	Open
	CMOS memory clear	J27	Closed
»	Cache controller normal operation	J28	Open
	Cache controller using different model that 82385	J28	Closed
»	NPU running at CPU speed	J30	Open
	NPU running at oscillator speed	J30	Closed
»	BIOS EPROM enabled	J32	Open
	BIOS EPROM disabled	J32	Closed

DRAM
Size	Bank 0	Bank 1	Bank 2	Bank 3
2MB	1MB	1MB	None	None
3MB	1MB	1MB	(4) 256K x 9	None
4MB	1MB	1MB	(4) 256K x 9	(4) 256K x 9
6MB	1MB	1MB	(4) 1M x 9	None
7MB	1MB	1MB	(4) 256K x 9	(4) 1M x 9
7MB	1MB	1MB	(4) 1M x 9	(4) 256K x 9
10MB	1MB	1MB	(4) 1M x 9	(4) 1M x 9

CACHE SIZE

Note: 32KB cache is factory installed and is not configurable.

SERIAL PORT
Setting	J11	J12
Normal operation	Open	Open
Indicated RS232 threshold level	Closed	Closed