Processor	CX486S/80486SX/AM486DX/CX486DX/80486DX/AM486DXLT/AM486DX2/ CX486DX2/80486DX2/80486DX4/80486SL/80486(P24D)/Pentium Overdrive/ UMC-U5
Processor Speed	25/33/40/50/66(internal)/75(internal)/100(internal)MHz
Chip Set	Unidentified
Max. Onboard DRAM	64MB
Cache	64/128/256/512/1024KB
BIOS	AMI
Dimensions	260mm x 220mm
I/O Options	32-bit VESA local bus slots (3), green PC connector
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	JP1	Reset switch	JP20
Power LED & keylock	JP15	Turbo switch	JP22
Speaker	JP18	Green PC connector	JP23
Turbo LED	JP19	32-bit VESA local bus slots	SL1 - SL3

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CMOS memory normal operation internal battery	JP1	pins 2 & 3 closed
	CMOS memory clear	JP1	pins 3 & 4 closed
»	Factory configured - do not alter	JP2	N/A
»	Flash BIOS voltage select 5v	JP3	pins 1 & 2 closed
	Flash BIOS voltage select 12v	JP3	pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2
1MB	(4) 256K x 9	NONE	NONE
2MB	NONE	(1) 512K x 36	NONE
4MB	(4) 1M x 9	NONE	NONE
4MB	NONE	(1) 1M x 36	NONE
4MB	NONE	(1) 512K x 36	(1) 512K x 36
6MB	NONE	(1) 512K x 36	(1) 1M x 36
8MB	(4) 1M x 9	NONE	(1) 1M x 36
8MB	NONE	(1) 2M x 36	NONE
8MB	NONE	(1) 1M x 36	(1) 1M x 36
10MB	NONE	(1) 512K x 36	(1) 2M x 36
12MB	(4) 1M x 9	NONE	(1) 2M x 36
12MB	NONE	(1) 1M x 36	(1) 2M x 36
16MB	(4) 4M x 9	NONE	NONE
16MB	NONE	(1) 2M x 36	(1) 2M x 36
16MB	NONE	(1) 4M x 36	NONE
20MB	(4) 1M x 9	NONE	(1) 4M x 36
20MB	NONE	(1) 1M x 36	(1) 4M x 36
32MB	(4) 4M x 9	NONE	(1) 4M x 36
32MB	NONE	(1) 4M x 36	(1) 4M x 36
32MB	NONE	(1) 8M x 36	NONE
64MB	NONE	(1) 8M x 36	(1) 8M x 36

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
64KB	(4) 8K x 8	(4) 8K x 8	(1) 8K x 8
128KB/1	(4) 32K x 8	NONE	(1) 16K x 8
128KB/2	(4) 16K x 8	(4) 16K x 8	(1) 16K x 8
256KB/1	(4) 64K x 8	NONE	(1) 32K x 8
256KB/2	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8
512KB/1	(4) 128K x 8	NONE	(1) 64K x 8
512KB/2	(4) 64K x 8	(4) 64K x 8	(1) 64K x 8
1MB	(4) 128K x 8	(4) 128K x 8	(1) 128K x 8

CACHE JUMPER CONFIGURATION
Size/Banks	JP5	JP10	JP11	JP12	JP13	JP14
64KB	pins 2 & 3 closed	pins 2 & 3 closed	Open	Open	Open	Open
128KB/1	pins 1 & 2 closed	pins 1 & 2 closed	Open	Open	Open	Open
128KB/2	pins 2 & 3 closed	pins 2 & 3 closed	Open	Open	Open	Closed
256KB/1	pins 1 & 2, 3 & 4 closed	pins 1 & 2 closed	Open	Open	Closed	Closed
256KB/2	pins 2 & 3 closed	pins 2 & 3 closed	Open	Open	Closed	Closed
512KB/1	pins 1 & 2, 3 & 4, 5 & 6 closed	pins 1 & 2 closed	Open	Closed	Closed	Closed
512KB/2	pins 2 & 3, 4 & 5 closed	pins 2 & 3 closed	Open	Closed	Closed	Closed
1MB	pins 2 & 3, 4 & 5, 6 & 7 closed	pins 2 & 3 closed	Closed	Closed	Closed	Closed

CPU TYPE CONFIGURATION
Type	JP27	JP28	JP29
CX486S	pins 2 & 3	pins 1 & 2, 3 & 4, 5 & 6	pins 1 & 2, 3 & 4, 5 & 6
80486SX	Open	pins 2 & 3	Open
AM486DX	Open	pins 2 & 3	pins 2 & 3
CX486DX	pins 2 & 3, 4 & 5	pins 1 & 2, 3 & 4, 5 & 6	pins 1 & 2, 3 & 4, 5 & 6
80486DX	Open	pins 2 & 3	Open
AM486DXLT	Open	pins 2 & 3	pins 2 & 3
AM486DX2	Open	pins 2 & 3	pins 2 & 3
CX486DX2	pins 2 & 3	pins 1 & 2, 3 & 4, 5 & 6	pins 1 & 2, 3 & 4, 5 & 6
80486DX2	Open	pins 2 & 3	Open
80486DX4	pins 1 & 2, 3 & 4	pins 1 & 2	pins 1 & 2
80486SL	pins 1 & 2, 3 & 4	pins 1 & 2	pins 1 & 2
P24D	pins 1 & 2, 3 & 4	pins 1 & 2, 4 & 5	pins 1 & 2, 4 & 5
P24T	pins 1 & 2, 3 & 4	pins 1 & 2	pins 1 & 2
UMC U5	Open	pins 2 & 3	pins 2 & 3
Note: Pins designated are in the closed position.

CPU TYPE CONFIGURATION
Type	JP30	JP32	JP33
CX486S	pins 2 & 3, 4 & 5	pins 1 & 2	pins 1 & 2, 3 & 4
80486SX	Open	Open	pins 2 & 3
AM486DX	pins 1 & 2	pins 1 & 2, 3 & 4	pins 1 & 2, 3 & 4
CX486DX	pins 1 & 2, 3 & 4, 5 & 6	Open	pins 2 & 3
80486DX	Open	pins 1 & 2	pins 1 & 2, 3 & 4
AM486DXLT	pins 1 & 2	pins 1 & 2, 3 & 4	pins 1 & 2, 3 & 4
AM486DX2	pins 1 & 2	pins 1 & 2, 3 & 4	pins 1 & 2, 3 & 4
CX486DX2	pins 2 & 3, 4 & 5	pins 1 & 2	pins 1 & 2, 3 & 4
80486DX2	Open	pins 1 & 2	pins 1 & 2, 3 & 4
80486DX4	pins 5 & 6	pins 1 & 2	pins 1 & 2, 3 & 4
80486SL	pins 5 & 6	pins 1 & 2	pins 1 & 2, 3 & 4
P24D	pins 3 & 4, 5 & 6	pins 1 & 2	pins 1 & 2, 3 & 4
P24T	pins 5 & 6	pins 2 & 3	pins 1 & 2, 3 & 4
UMC U5	pins 1 & 2	pins 3 & 4	pins 2 & 3
Note: Pins designated are in the closed position.

CLOCK SPEED CONFIGURATION
Speed	JP6	JP7	JP8
25MHz	Open	Open	Closed
33MHz	Closed	Closed	Closed
40MHz	Open	Closed	Closed
50MHz	Closed	Open	Open
66iMHz	Closed	Closed	Closed
75iMHz	Open	Open	Closed
100iMHz	Open	Closed	Closed

CPU VOLTAGE CONFIGURATION
Voltage	JP24	JP25	JP26
5v	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
3.3v	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed

VESA WAIT STATE CONFIGURATION
Wait states	JP17
0 wait states	Open
1 wait state	Closed

VESA BUS SPEED CONFIGURATION
CPU speed	JP16
<= 33MHz	Open
> 33MHz	Closed