D

Data General Corporation, 258
Data processing. See Programmed Data Processor
Data tabulation, for 1880 Census, 706
Decimal machine. See ENIAC; UNIVAC
Decimal point, invention of, 12
Decimal vs. binary systems, 34
Decoder, electronic, 146
Defense Calculator (IBM 701), 1923
Defense network, computerized. See SAGE computer
De Forest, Lee, 225
Delamain, Richard, 11
Delay lines, 1501
Deltamax, and computer memory, 2012
Difference Engine, 36, 414, 589

construction of, 4757
plans for, 43
size and description of, 5455
sketch of, 48
uses of, 57

Differential analyzer, 87, 113, 122

building of, 8788
initial idea for, 86
universities and, 1078

Differential equations, 83
Digital electronic calculators

development of, 1138
special purpose (see Atanasoff-Berry Computer)

Digital Equipment Corporation, 255, 25759, 265, 26668

development of personal computer and, 26768
founder of, 202
PDP-1, 257
PDP-8, 25758, 267
VAX- 11/780, 258

Digital vs. analog devices, 13, 15
Distributed processing, 258
Dodd, Stephen, 201
Dudley Observatory, 57
Dummer, G. W. A., 23032
Durfee, Benjamin M., 104