PT-428 486 VESA Motherboard

        - BIOS ID string  40-0101-428054-00101111-111192-UMC491-H
        - 8-30 pin SIMM slots   (1-32meg FPM DRAM)
        - 3-32bit VESA Local Bus slots
        - 6-16bit ISA slots
        - 1-8bit XT slot
        - 32-256k cache support in 8-28pin sockets + 1 TAG RAM socket
        - AMI Bios
        - UMC Chipset                       <--- please confirm version
        - supports 80486sx/dx/dx2,pentium overdrive at 25/33/40/50/66mhz
        - manufactured by: pine technology


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Jumpers:

CPU Select

	U19		JP17		JP18
	DX		1-2, 3-4	1-2
	P23		2-3		OFF
	P23N		1-2, 3-4	2-3

	CLK		JP21		JP9		JP8
	25Mhz		ON		1,2		2,3
	33Mhz		ON		2,3		2,3
	40Mhz		OFF		1,2		1,2
	50Mhz		OFF		1,2		2,3

Cache Select

		JP12	JP13	JP14	JP15	JP16
	32K	OFF	2-3	OFF	OFF	OFF
	64K	OFF	1-2	OFF	ON	OFF
	128K	2-3	2-3	OFF	ON	ON
	256K	1-2	1-2	ON	ON	ON