I used a 486 66dx2 with 20 megs of ram until 2001 when I got a laptop for college. FreeBSD and console only programs but it got the job done. Did all my high school work on it and an external X2 modem. Even brought it to college and slapped a network card in it to act as a proxy server. They have us 1 gig of data per day. But they did it by MAC address not port. So I just had all my friends proxy over to that box and it would just change MACs right before the gig. Unlimited data!
I also had a 486/66 and I loved that thing but it was slow as hell, what so many dev achieved with it is humbling