The IBM 402 and IBM 403 Accounting Machines were tabulating machines introduced by International Business Machines in the late 1940s.

Overview

The 402 could read punched cards at a speed of 80 to 150 cards per minute, depending on process options, while printing data at a speed of up to 100 lines per minute. The built-in line printer used 43 alpha-numerical type bars (left-side) and 45 numerical type bars (right-side, shorter bars) to print a total of 88 positions across a line of a report. The IBM 403 added the ability to print up to three lines, such as a multiline shipping address, from a single punchcard, instead of just one line per card with the 402. The 402 and 403 were primarily controlled by a removable control panel. Additional controls included a

carriage control tape A carriage control tape was a loop of punched tape that was used to synchronize rapid vertical page movement in most IBM and many other line printers from unit record days through the 1980's. The tape loop was as long as the length of a single p ...

and mechanical levers called hammersplits and hammerlocks, that controlled some printing functions. Both the and were considered smaller models of the prior model

IBM 405 __NOTOC__ Year 405 ( CDV) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Stilicho and Anthemius (or, less frequently, year 1158 ''Ab ...

. In July 2010, a group from the

Computer History Museum The Computer History Museum (CHM) is a museum of computer history, located in Mountain View, California. The museum presents stories and artifacts of Silicon Valley and the information age, and explores the computing revolution and its impact on ...

reported that an IBM 402 was still in operation at Sparkler Filters, Inc., a manufacturing company that produces chemical filtration systems, in Conroe, Texas, still as of 2022 the company's accounting and payroll is done on the oldest American computer in service within the United States of America or elsewhere on the Earth.Visit to a working IBM 402 in Conroe, Texas
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References

External links

IBM History: 402 developed in 1948 or 1949

* ttp://www.pcworld.com/article/249951/if_it_aint_broke_dont_fix_it_ancient_computers_in_use_today.html Company that still uses IBM 402 {{DEFAULTSORT:Ibm 402

402 __NOTOC__ Year 402 (Roman numerals, CDII) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Arcadius and Honorius (or, less frequent ...

Overview

See also

References

External links