COMPUTER SCIENCE Punch cards cartacee for meccanografico center Honeywell; used from 1920 to 1969 approximately.; for the stable memorization of codified data. Afterwards the technology has afforded to conserve given on magnetic support; earning in maneuverability and space: daglii years around 1970 the recording becomes digital on magnetic support and then optician; the support in the first case was floppy disc and then the CDROM and DVD