Tested. Working perfect. See photo. With CPU Am486DX2 80MHz , 128KB Cache, 16Mb FPM RAM, Heatsink & I/O Cables
 
Chipset SiS 85C496/497 (486-VIP 486 Green PC VESA/ISA/PCI Chipset)
Socket Socket 3 (PGA237)
FSB speeds 25MHz33MHz40MHz
Form factor Baby AT (max 220 x 330 mm)
Dimensions 254mm x 218mm
Release date 1994
Cache 128KB2
Max RAM size 128MB
RAM types 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
1x 32-bit VLB