I get asked questions about slot machines all the time and the answer often depends on the machine type or version. Reel slot machines seem to cause the most confusion especially with IGT games. IGT has had two main versions of their machines the S-Plus and the S2000. The S-plus machines were manufactured from the late 80’s to the late 90’s while the S2000 where manufactured from the late 90’s on. One way to tell the machines apart and the easiest is their display or LED’s. The S-Plus machines can only display numbers while the S2000 can do both. Other ways to tell would be the processors which are the 8032 for the S-Plus and the i960 for the S2000. And of course the electronics of the machine/style (newer vs old) will be a giveaway.