Give a brief summary of the above text. The units that are visible in any computer are the physical components of a data
processing system, or hardware. Thus, the input, storage, processing and control
devices are hardware. Not visible is the software — the set of computer programs,
procedures, and associated documentation that make possible the effective operation
of the computer system. Software programs are of two types: systems software and
applications software.
Systems software are the programs designed to control
the operation of a computer system. They do not solve specific problems. They are
written to assist people in the use of the computer system by performing tasks, such
as controlling all of the operations required, to move data into and out of a computer
and all of the steps in executing an application program. The person who prepares
systems software is referred to as a systems programmer. Systems programmers are
highly trained specialists and important members of the architectural team.
Applications software are the programs written to solve specific problems
(applications), such as payroll, inventory control, and investment analysis. The word
program usually refers to an application program, and the word programmer is
usually a person who prepares applications software. Often programs, particularly
systems software, are stored in an area of memory not used for applications software.
These protected programs are stored in an area of memory called read only memory
(ROM), which can be read from but not written on.
Firmware is a term that is commonly used to describe certain programs that are
stored in ROM. Firmware often refers to a sequence of instructions (software) that
is substituted for hardware. For example, in an instance where cost is more important
than performance, the computer system architect might decide not to use special
electronic circuits (hardware) to multiply two numbers, but instead write instructions
(software) to cause the machine to accomplish the same function by repeated use of
circuits already designed to perform addition.

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