Check the listing for details. 3x VINTAGE MAINFRAME COMPUTER Perforated PUNCH CARDS IBM 80 column card format. Listed at 13.44 USD. 3 pcs. Soviet punch cards made similar as IBM format and have 80 characters as standard. According to the IBM standard, each card must have size 7 3 inches (187.325 82.55 mm), card thickness 0.007 inches (0.178 mm). Total one punch card can save only 24 machine word. One machine word had a size of 36 bits (in period time when were used the punch cards). Similar punch cards were used for first mainframes in USA (IBM series: 704/709/711/709/7094, American machines UNIVAC) and also for others computing systems. With help these punch cards first programmers wrote first programs using programming languages: Cobol, Algol, Fortran, Assembler and others. We even saw the first games for mainframe developed with help Fortran and similar punch cards about 20 years ago.