direct data entry(DDE)

A system for simultaneously performing the operations of data preparation and data entry. Source data is entered by an operator at a direct data entry terminal which is, typically, a VDU. The terminal is on-line to the computer and transfers data to magnetic tape (key-to-tape) or magnetic disc (key-to-disc). The operation is under control of a program that can validate the input with respect to certain types of errors (fields omitted; groups repeated; numbers not recognized) and indicate the location of the error and its type on the screen of the VDU. Complete verification still requires the reentry of the source data (by a different operator).; 用于同時執行數據準備和數據輸入操作的系統。源數據由操作員在直接數據輸入終端輸 入,典型的終端是一個視頻顯示器。它與計算機在線連接并傳送數據到磁帶(鍵盤-磁帶)或 磁盤(鍵盤-磁盤)。操作是在程序控制下進行的,該程序能確認一定類型的輸入錯誤(如丟 字段,組重復,不能識別的數),并在視頻顯示器的屏幕上指示錯誤的位置及其類型。完整的 校驗還需要重復輸入源數據(由不同的操作員輸入)。