| 词条 | IBM 402 |
| 释义 |
The IBM 402 and IBM 403 Accounting Machines were tabulating machines introduced by International Business Machines in the late 1940s. OverviewThe 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.[1] 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.[1] The 402 and 403 were primarily controlled by a removable control panel. Additional controls included a carriage control tape and mechanical levers called hammersplits and hammerlocks, that controlled some printing functions.[1] Both the {{nobr|IBM 402}} and {{nobr|IBM 403}} were considered smaller models of the prior model IBM 405. In July 2010, a group from the Computer History Museum reported that an IBM 402 was still in operation at a filter manufacturing company in Conroe, Texas.[2] See also
References1. ^1 2 {{cite book |title = IBM Accounting Machine: 402, 403 and 419 Principles of Operation |id=Form 224-5654-13 |year=1963 |url= http://www.bitsavers.org/pdf/ibm/punchedCard/AccountingMachine/224-1614-13_402-403-419.pdf}} 2. ^Visit to a working IBM 402 in Conroe, Texas External links
1 : IBM unit record equipment |
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