1 I/O environment
2 data processing system
3 external environment
4 human-related
5 human-in¬dependent
6 remote banking terminal
7 measures traffic flow
8 reel of magnetic tape
9 collected data are stored
10 binary format
11 Input-Output Interfaces
12 entered from a keyboard
13 bar-code readers
14 regardless
15 transformed into the binary codes
16 to match character¬istics
17 manner similar
18 output interfaces
19 to reverse the process
20 to adapt the I/O device to the external environment