[Edit] Nevermind, I searched the second time on Google and results mysteriously showed up.
I just picked up this keyboard with 5-pin plug (was told by the lady that it is MIDI) about an hour ago and I've no idea what brand or model it is. It looks to be a Chicony but here are the pictures:
I'm glad I won't be using the crappy Logitech S-510 keyboard any longer.
Also there's some A X thing in the back. I'm not sure what that's all about but it looks like it's some sort of switch.