Versatility program storage, up to 111 operating steps possible with checking of stored program and correction of mistakes possible, too. Jump key function for wider range of applications in calculation. Seven registers for memory and one for total. 15 Regsiters. Easy-to-read numeral display not cluttered up with unnecessary zeros. Automatic square root key to obtain square root of any number. Automatic round off and decimal point entry. Bipolar integrated circuits.