Tested. Working perfect. See photo. With CPU Am486DX2 66MHz, 256KB Cache, 16Mb FPM RAM, I/O cCables & Heatsink+Cooler
 
Chipset SiS 85C496/497 (486-VIP 486 Green PC VESA/ISA/PCI Chipset)
Socket Socket 3 (PGA237)
FSB speeds 25MHz33MHz40MHz50MHz
Form factor Baby AT (max 220 x 330 mm)
Release date 1995
Cache 128KB256KB512KB
Max RAM size 256MB
RAM type 72-pin FPM
PSU connector AT (6-pin P8 + 6-pin P9)
I/O ports
1x AT Keyboard
1x Floppy interface
2x IDE interface
1x PS/2 mouse
1x Parallel
2x Serial
Expansion slots
4x 16-bit ISA
3x 32-bit PCI