The UPI-C42 is an enhanced CHMOS version of the industry standard Intel UPI-42 family It is fabricated on Intel's CHMOS III-E process The UPI-C42 is pin software and architecturally compatible with the NMOS UPI family The UPI-C42 has all of the same features of the NMOS family plus a larger user programmable memory array (4K) hardware A20 gate support and lower power consumption inherent to a CHMOS product The UPI-L42 offers the same functionality and socket compatibility as the UPI-C42 as well as providing low voltage 3 3V operation