Huge project weekend, couple more mobos for testing dozens of video cards for DOS. Became kind of a technical nightmare with trying to use a CF/IDE adapter, which I gave up on after about three hours. It seemed to be actively sabotaging, no matter what changes I made to the configuration, it would try to boot to CF if it was plugged in, so I couldn't reformat it or copy files. UBCD could see it but nothing worked. My Conner 1gb drive seems to have died in the process as well.
The Gateway P2 233 is kind of amazing, perfect balance of old and new features for a late non-speed-sensitive DOS machine. USB as well.
Finally used a Fujitsu drive and got the 486 running, after a lot of config headaches, though after testing a few cards I got a memory parity error and packed it in for the day.
I went to Goodwill and got a C64 modem for $2.50 though, and a few other things. They never have computers anymore, anything interesting just happens to have slipped by the sorters.