1.What can a computer do？ 1
2.Computers （Ⅰ） a dialogue 4
3.Computers （Ⅱ） a dialogue 8
4.Digital computers a dialogue 12
5.Analogue computers 16
6.Basic functional units of a computer 20
7.The binary system 23
8.Instructions 26
9.Logic circuits 30
10.Input-output units 33
11.Memory units 36
12.Arithmetic units 40
13.Control units 43
14.Software 46
15.The concept of a program 50
16.Arithmetic operations （Ⅰ） 54
17.Arithmetic operations （Ⅱ） 58
18. Loading 61
19.Branching without looping 64
20.A Typical subroutine 68
21.Punched card equipment 72
22.Non-impact printing 75
23.Visual display output 79
24.Programming languages 83
25.Fortran， algol and cobol 86
26.Programming’s upstart language：APL 90
27.Operating systems （OS） provide automatic systems control 94
28.A Square-summing， high-speed multiplier 97
29.The role of small computers （Ⅰ） 101
30.The role of small computers （Ⅱ） 105