Word of advice - if you know anything about the code that nobody else does, use it as leverage. Come in one day, call your boss into an office and tell him you're quitting. When he asks why - voice your problems with the tools you work with. Offhandedly suggest that you actually wouldn't mind staying if work wasn't such a pain in the ass thanks to these issues. Outline how much it will cost them to train a new employee up and how much cheaper the hardware is in comparison.

Alternatively, just complain incessantly without threatening to quit if you can't get another job easily.

Reason I say this is that me and my team have been working on shoddy hardware for the last six months, then we put our collective feet down and demanded something better. Now we each have a pretty damn sweet system to work on.