Yeah, we had to load gently, and the thermocouple probably needed to be replaced (if you were exploding cans). The coldest soda in the university though. =)
Yes - it was meant for steel cans. The mechanism at the bottom to output cans was literally an open pair of scissors driven by a giant 120V solenoid.
When I was there, the machine controlling the soda machine was a Linux box running some old Debian with a 2.4 kernel, on VIA or some non-Intel/AMD x86 processor, booting from iSCSI. Thankfully, it was upgraded when the machine was rebuilt. How much of this was around in your time there?
Nice work with it. Definitely a staple of the ACM office :)
edit: also, it survived a building move, so that's pretty awesome.
Man, memories. =)
When I left in 2011, there was a card reader and a touch screen, so you swiped your card, and then selected your choice on the screen. I think it may have also had a random button at one time or another. The intention was to eventually wire up the physical buttons once again to work closer to a regular soda machine.
For a while, it was wired up to twitter: https://twitter.com/acmsoda
We did have some special "admin" cards for correcting misvends, typically someone's library card or something similar.
I'm amazed the thing kept tweeting a year after I graduated.