CPU	: intel 486sx, intel 487sx, intel p24t, intel overdrive, intel/Cyrix 486dx/dx2, 
	  Cyrix 486s/s2, all AMD
Freq.	: 25Mhz, 33MHz, 40Mhz, 50MHz
Expansion
- two 32-bit VL_bus
- 4 AT bus
- 1 XT bus
Cache	: 64kb, 128kb, 256kb
Ram	: 1-32 Mb, 256kb/1mb/4mb SIMM
fast GateA20 and reset support

	Jumper
jp3	: open 	: display Monochrome
	  close	: display Color/EGA/VGA
jp5	: 1-2	: retain CMOS data
	  2-3	: discharge CMOS
jp6	: 2-3	: FACTORY SETTING

CPU					jp8	jp9	jp12	jp13	jp24
486sx (PQFP)				open	open	open	2-3	open
486sx, cyrix486s(PGA)			open	close	open	2-3	open
487sx, overdrive			close	close	2-3	1-2	open
486dx/dx2,cx486dx,cx486s+cx487s		close	close	1-2	1-2	open
cx486s2					close	close	open	2-3	close
cx486dx2				close	close	1-2	1-2	close

Freq		jp16		jp17		jp18
25MHz		close		open		close
33MHz		open		close		close
40MHz		close		open		open
50MHz		open		close		open

CPU												Oscillator in Y2
486sx-25,487sx-25,overdrive-25,486dx2-50,cx486s2-50,cs486dx2-50						25MHz
486sx-33,487sx-33,overdrive-40,486dx-33/40,486dx2-66,cx486dx2-66,cx486s-33/40, cs486dx-33/40		33MHz/40MHz
486dx-50,cx486s-50,cx486dx-50										50MHz

Cache		jp14	jp15	jp21	Data SRAM(u37-40/29-32)		Tag SRAM(u41)	Cacheable range
64k		1-2	open	2-3	8k x 8				8k x 8		16Mb
128k		2-3	1-2	2-3	32k x 8				8k x 8		32Mb
256k		2-3	2-3	1-2	32k x 8				32k x 8		64Mb

Vesa Speed		jp19
<=33MHz			1-2
>33MHz(default)		2-3

Vesa Wait State		jp20
0 Wait state		1-2
1 Wait state(default)	2-3

Memory			Bank 0		Bank 1			
1MB			256kb		---
2MB			256kb		256kb
4MB			1MB		---
8MB			1MB		1MB
16MB			4MB		---
20MB			1MB		4MB
32MB			4MB		4MB
Note : use minimun 80ns DRAM


	Connector
j17		Keyboard lock and Power led
j18		Speaker
j19		Hardware reset switch
j20		External Battery (pin 1 = battery +, pin 4 = battery -)
j21		Turbo switch
j22		Turbo led

	Advanced CMOS setting
CPU->				486/7sx-25,486dx2-50	486/7sx-33,486dx2-66	486dx-40,cx486s-40	486dx-50
				P24T-50, Cx486dx2-50	P24T-66, Cx486dx2-66	cx486dx-40		cx486dx-50
				Cx486s2-40/50		Cx486s-33,486dx-33
							Cx486dx-33
Cache Size->			64kb/128kb/256kb	64kb/128kb/256kb	64kb/128kb/256kb	64kb/128kb/256kb
DRAM speed option		Fastest			Slower			Slower			Slower(default)
DRAM write CAS Pulse		1T			1T			2T			2T(default)
Cache write cycle Option	2T			2T			3T			3T(default)
Cache read cycle Option		1T			1T			2T			2T(default)
Bus clocl freq. select		1/3 clk			1/4 clk			1/5 clk			1/6 clk
osc/clock generator		25Mhz			33Mhz			40MHz			50MHz