There is no exact requirement for the hardware. The slowest system we've tested on was Pentium Pro 200 under Linux appletviewer and it worked fine. (Pentium-75 under Windows 95 is playable but no fun)
We can provide some sort of technical support for using Scorch and running
ScorchServer on the following platforms: Windows, Linux and FreeBSD.
Other systems should obviously work as well, but we can get our hands
only on these three.