PS486 Motherboard Settings and Configuration

Processor	80486SX/80486DX/80486DX2/80486DX4/P24D/P24T
Processor Speed	33/66(internal)/100(internal)MHz
Chip Set	Intel
Video Chip Set	None
Maximum Onboard Memory	128MB
Maximum Video Memory	None
Cache	128/256KB
BIOS	Phoenix
Dimensions	337mm x 122mm
I/O Options	AUI connector, floppy drive interface, IDE interface, SCSI interface, parallel port, PS/2 mouse port, serial ports (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
SCSI interface	CN1	PS/2 mouse port	CN7
IDE interface	CN2	AUI connector	CN8
Floppy drive interface	CN3	AT keyboard connector	CN9
Parallel port	CN4	AUI receive LED	JP4
Serial port 1	CN5	AUI active link LED	JP5
Serial port 2	CN6	Hard drive LED	JP7

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Parity select DPU generation	JP2	Pins 1 & 2 closed
	Parity select CPU generation	JP2	Pins 2 & 3 closed
»	SCSI speed select 33MHz	JP8	Pins 2 & 3 closed
	SCSI speed select 40MHz	JP8	Pins 1 & 2 closed
»	Watchdog timer enabled	JP16	Pins 2 & 3 closed
	Watchdog timer disabled	JP16	Pins 1 & 2 closed
»	PS/2 IRQ 12 enabled	JP17	Pins 1 & 2 closed
	Next Step OS used	JP17	Pins 2 & 3 closed
»	PCI bus speed select 33MHz	JP23	Pins 2 & 3 closed
	PCI bus speed select 25MHz	JP23	Pins 1 & 2 closed
»	Factory configured - do not alter	JP27	Unidentified
»	Monitor type select color	SW1/1	On
	Monitor type select monochrome	SW1/1	Off
»	Flash BIOS enabled	SW1/2	On
	Flash BIOS disabled	SW1/2	Off
»	CMOS memory normal operation	SW1/3	Off
	CMOS memory clear	SW1/3	On
»	Factory configured - do not alter	SW1/4	Unidentified

DRAM CONFIGURATION
Size	Bank 0	Bank 1
8MB	(2) 1M x 36	None
16MB	(2) 1M x 36	(2) 1M x 36
24MB	(2) 2M x 36	(2) 1M x 36
32MB	(2) 4M x 36	None
40MB	(2) 4M x 36	(2) 1M x 36
48MB	(2) 4M x 36	(2) 2M x 36
64MB	(2) 8M x 36	None
64MB	(2) 4M x 36	(2) 4M x 36
96MB	(2) 8M x 36	(2) 4M x 36
128MB	(2) 8M x 36	(2) 8M x 36

CACHE CONFIGURATION

Note: The location of the cache is unidentified.

CACHE JUMPER CONFIGURATION
Size	JP24	JP25
128KB	Open	Open
256KB	Closed	Closed

CPU TYPE SELECTION
Type	JP1	JP14	JP15	JP18
80486SX	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 1 & 2 closed
80846DX	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
80486DX2	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
80486DX4	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
P24D	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 2 & 3 closed
P24T	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 2 & 3 closed

CPU TYPE SELECTION
Type	JP22
Non SL enhanced	Pins 1 & 2 closed
SL enhanced	Pins 2 & 3 closed

CPU CACHE SELECTION
CPU	Cache	JP6	JP12	JP19
80486SX	WT/WT	Pins 5 & 6 closed	Pins 2 & 3 closed	Closed
80486SX	WT/WB	Pins 1 & 2 closed	Pins 1 & 2 closed	Open
80846DX	WT/WT	Pins 5 & 6 closed	Pins 2 & 3 closed	Closed
80846DX	WT/WB	Pins 1 & 2 closed	Pins 1 & 2 closed	Open
80486DX2	WT/WT	Pins 5 & 6 closed	Pins 2 & 3 closed	Closed
80486DX2	WT/WB	Pins 1 & 2 closed	Pins 1 & 2 closed	Open
80486DX4	WT/WB	Pins 5 & 6 closed	Pins 2 & 3 closed	Closed
P24D	WB/WT	Pins 5 & 6 closed	Pins 1 & 2 closed	Closed

CPU MULTIPLIER SELECTION
Multiplier	JP13
2x	Pins 2 & 3 closed
3x	Pins 1 & 2 closed

SERIAL PORT 2 SELECTION
Setting		JP9	JP10	JP11
»	RS232	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
	RS422	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
	RS485	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed