Could someone explain:

[jc173]

This came up a week or two ago and my guess it has something to with an 8 bit variable being somehow associated with storing info about the systems. Possibly some sort of bitmap relating to an internal bookkeeping variable, possibly the ID number of the system used by the game. You could try to add more, but my guess it is that it won't generate more than 255 and the game itself might possibly crash.