出典:国際連合
Purely mechanical processing (220-4) did not involve the use of electronic equipment 1 which has come to replace the earlier tabulating machines 2 or unit record machines 2 and is much more versatile. In most instances the information is coded (221-1*) first, and then transcribed onto punch cards 3 by using a keypunch 4. A card verifier 5 is a device used to check the accuracy of the punching. These two types of unit record machines remain in common use since the punch cards are still a frequent way of entering data into the computer. The use of other types of unit record equipment such as the card sorter 6 and the tabulator 7 has declined. Increasingly, the data are entered directly on magnetic tapes (cf. 226-4) or disks (cf. 226-5) without resorting to punch cards.
出典:Wikipedia
出典:『Wikipedia』 (2011/03/13 15:54 UTC 版)
An adding machine was a class of mechanical calculator, usually specialized for bookkeeping calculations. In the United States, the earliest adding machines were usually built to read in dollars and cents. Adding machines were ubiquitous office equipment until they were phased out in favor of personal computers, beginning in about 1985. The machines were rarely seen after the year 2000.