Man... but this keyboard is just NOT BIG ENOUGH. Maybe an Accom instead?
There is some software for these Deko keyboards. As far as I could tell it is needed for the extra keys and the screen to do anything useful with the DEKO software only. From what I could find out about it, all that is controlled by the option rom chip. So perhaps if you just yank that out (it's the removable one in the dip socket) it could make it easier to get it working with some other controller?
I couldn't find anywhere to download it from and Avid didn't seem to interested in giving me a download link or anything since I didn't own the full system. It seems the keyboard driver stuff is bundled up with the program suite so I suppose that's understandable. But I didn't have a power supply either so I just parted mine and chucked the other stuff. I got mine for dirt cheap so I wasn't really too fussed about it.
I have the software (see the flickr gallery) but it's only for windows 2000. According to the user manual I have, you just install the driver and go.
Anyway, all the keys output scancodes, so they are (in theory) capturable by a PS/2 to USB converter (I can see them all in HID_listen_ when using soarer's converter code) and then you can do what you want with it, but for some reason it doesn't sent the full scancode its' supposed to (compared with several "normal" PS/2 keyboards, but for some reason it works (well 104 of the keys do plus 2-17 of the "special" ones) well enough on a commercial PS/2 converter.
I can't believe you chucked it! The obvious quality is well worth using! It's one of the best-quality cherry MX boards you can get. Why spend $$$ on a korean metal KB when you can have this instead?
If you look at the PCB, the PSU just outputs 12V over a DIN connector.