The fourth known version is part number 2191011-00-911 and it is creatively dubbed “version 3”. Its most common vintage seems to be 1994. This version has a PS/2 style plug and like the version 2 does not have the “AnyKey” inscription on its face. The silver gray label on the reverse is done away with, replaced with raised lettering that is very difficult to read. The raised lettering is otherwise identical to the writing on the labels of previous versions. As with the version 2's, this keyboard must be programmed by holding control while pressing Program Macro. Inside, this version's controller board is longer and narrower with a slightly different layout than previous versions. Unlike said previous versions, this version's chassis is held together with screws but the internals are held together and bound to the lower half of the chassis by many plastic pegs that are a part of the support layer. These are pushed through the lower chassis and melted into a mushroom shape ("heat staked"), holding the keyboard together and making it impossible to disassemble for service without breaking or carefully drilling out the heat fastened pegs. After being dismantled, keyboards of this version are difficult to properly reassemble due to their lack of screws to align the internals.