dont forget pc/104 then we have sips, simms, dimms, and then the all them pesky jumpers to configure the 486 processor, and don't forget making your you don't have conflicts between your mutsumi 1x cdrom drive and your lpt port, and configure all the dma channels for the sound card, and when plug in play was really "plug in and pray it worked" how about upgrading that 286 ram, with dips
I (annoyingly) blew 2 server PSUs by putting a 'univeral' 3.3V and 5V matrox graphics card into a server, wasn't universal and completely wrecked the PSU.