Sistem informasi manajemen McLeod ch 1

Introduction to Computer Architecture (Cont’d)

—Modem-hardware device that modulates the digital signals from a computer into analog signals (telephone system), and vice versa. Direct communication standard Between computers is much faster. —Wireless networks

Figure 1.5 Communications Architecture

The Evolution in Computer Applications

—Information systems are virtual systems that enable management to control the operations of the physical system of the firm.

—Physical system-tangible resources such as materials, personnel, machines, and money.

—Virtual system-information resources that are used to represent the physical system.
Figure 1.6 The Physical System of the Firm

The Evolution of Computer Applications (Cont’d)

—Open system is a firm’s physical system that interacts with its environment by means of physical resource flows.

—Closed system is one that does not communicate with its environment.