I was fortunate enough to have picked up this AT&T Globalyst 590 PC witn an Intel Pentium 66Mhz. It was in pretty rough shape when I got it, it lacked a PSU / power button and hard drive and I didn't know if it still worked but I really like the look and feel of this case. So I added a PSU and a hard drive, installed windos 95 and it worked fine.