My 286 motherboard arrived today, so I got to work testing it out. I had 2 spare I/O cards from a couple of old/dead 486 systems that I'd kept over the years. Not sure why I'm surprised, but they both worked perfectly on this motherboard. I added a Floppy Drive & spare IDE Hard Drive and was able to get set up on DOS, with the help of Ontrack Disk Manager to utilise the full size of the HDD, as the BIOS was a bit limiting.
It's not built into a case yet, but the spec as it currently stands -
286 12MHz
1MB RAM
120MB Fujitsu IDE Hard Drive
3.5" Floppy Drive
Running MS-DOS 5.0
Only played around with it briefly and played a few games: QBasic Nibbles, Bubble Bobble, Felix, Gorenju, Tetris, Blox, Viking, Orby, Diggory, Ranger & Connex. Many of those obscure games I listed are from my old dead 8088 PC, found them on 5.25" floppies years ago and they all seem to run nicely on this 286 (a couple are slightly fast, but not unplayable as they would be on a 386 or above). Once I've sorted a case and experimented with lowering the CPU speed to 6MHz, I'm sure some of these games will run even better!