Lost Classmate Power Supply

[Aaron V]

So, as the season started we started rooting through our control system stuff that we haven't used since Nov/Dec. Unfortunately, one of the things we couldn't find is the power supply for our Classmate. After looking around for a bit, we still couldn't find it and unfortunately we had to leave for the day.

Later at home I was rooting through my IBM power supplies (I have more than I expected) and found one rated at 19V, 2.4A. The Classmate is rated at 20V, 2.0A. These numbers are obviously similar but I'm still a little nervous using them together - I don't want to damage the Classmate. Can anyone tell me what exactly these numbers mean (I already know what volts and amps are, but I don't know how exactly they apply to this power supplies) and if it's okay to use this power supply?

Thanks