You most likely have the 2.1 chip as the 2.2 chip was an after market product. George Payne programmed them and sold them direct to users for $125. The only Cointrax Millennium II's that were sold new with the 2.2 version chip were those sold by Mr Bill, and those he sold came from the factory with the 2.1 chip. He purchased the 2.2 chips from Hambyware, George Payne's company, and gave the buyer the option of the 2.1 or the 2.2 at an additional cost. Except for possibly a few Millennium II's that were sold new with a 2.0 Version chip all the others had the 2.1 chip. Version 2.0 had a bug in the programming that would occasionally cause a problem that required the user to do a factory reset. George corrected the bug and sent everyone who contacted him about the bug a 2.1 chip at no cost. Sean at A&S Company replaced the 2.0 chip with the 2.1 before he sold any, but Kellyco undoubtedly sold some Mellinneum II's with the 2.0 chip. The chips had a sticker on top that designated the version, as shown in the photo of the module from an older metal case Baron. It also show the location the resistor has to be added that's necessary to allow adjusting the staccato audio volume and duration.