type drum

type drum

[′tīp ‚drəm]
(computer science)
A steel cylinder containing 128 to 144 lateral bands, each band containing the alphabet, the digits 0-9, and the standard set of punctuation marks such as commas and periods, and revolving at high speed; printing is achieved by a hammer facing each band and activated at the right time to cause a character to be printed on the paper flowing between hammers and drum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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