Starting in 1972, the 4002 was first supplanted and then replaced by the 4010. A number of changes and simplifications allowed these to be far less expensive, initially released at $3,950 ($ in ) and another $290 for a host adaptor. Other models in the 4010 series included the 4012 which added lower case characters, and the 4013 with an APL character set. These were implemented using plug-in boards that could be added to the base-model 4010 as well. In the 1980s, a version using a built-in RS-232 port and a number of missing features was released as the 4006, which was small enough to fit on a desk, selling for $2,995 in 1980 ($ in ).