I've been having a ton of fun with my ASUS Terminator P4 (and I anticipate having a lot of fun with my Terminator K7 as well)!
I've done a variety of things in the past few days, including installing NetBSD and FreeDOS on some of my hard drives to see what they're like on hardware such as this. The answer? Pretty good!
I first installed FreeDOS, which installed just fine. It comes with mouse drivers out of the box and works fine with USB mice and keyboards. It doesn't have support for the AC'97 sound hardware in the machine, understandably so. I could easily remedy this by getting something like a COVOX Speech Thing/other parallel port sound device, or getting a PCI sound card that has DOS drivers.
Next up I installed NetBSD. This was a bit more difficult, in all honesty. I wasn't expecting the OS to have so much trouble with USB devices, but it seems to completely reject the SiS chipset's USB and will hang on boot or present other strange behaviors when it's used.
Eventually though, I was able to get it installed and, other than the lack of USB and sound, it works beautifully, and I know that, once I can migrate this to a bigger disk, it'd make for a wonderful machine to have on hand.
I've been dabbling in short form content, and here's a little YouTube Short I made on my experience with FreeDOS on this machine:
I also took the opportunity to have fun with some of the weird behaviors that NetBSD was showing while trying to boot from USB:
I'll have a full video in the next week or so about installing NetBSD on the system, and I can't wait to do more with both my ASUS systems :)