Make it 486 ?
Make It 486, Top Make It 486, Bottom
U1 50G6663
U3 387SX ??
X1 66.66 MHz osc
P1 68 pin PLCC header
U5 Altera prom, D4-10 .015B
1

U1 looks like a 486SLC2... couldn't prove it...
 


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