How can I figure out how many watts my old ps has?

[pellel]

I have an old computer (not in use) that ran a Pentium 200 cpu, 4mb video card, Asus mobo, cd-rom, and sound card. Since I want to be environmental friendly I intend to re-use my old PS in that from that system. The problem is that I have no clue what the maximum capacity of the ps is. There are no stickers, markings or any other useful info on it.

Do you guys know any alternative way to solve the problem?
Will there be any compatibility problems using the ps in an ATX or BTX system since the ps has been used in a baby-at form factor system.

I am aware that I new a special adapter for powering the cpu and that the ps won't be able to supply a new and powerful system, but that's not my intention. I already have a fine working system with an idea to use the soon to be system as a low power consuming server instead.

 

[Crashman]

AT power supplies don't even have the 3.3v line needed by ATX systems.

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