By 1972, NMOS technology had finally been developed to the point where it could be used in commercial products. Both Intel (with the 2102)[15] and IBM[2] introduced 1 kbit memory chips. As the electron mobility in the n-type channel of NMOS MOSFETs is about three times that of the hole mobility in the p-type channel of PMOS MOSFETS, NMOS logic allows for an increased switching speed.