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*Low-level languages -- "natural language" of a computer & such as , is defined by its hardware design.. it is also a machine dependent, can be used on only one type of a computer. *assembly languages -- a set of instruction that a programmer can used to create program for use on a specific proccessor. *High-level languages -- that provide s some level of abstractions from assembler language & independence from a particular type of machine.
The assembly languages provide human-readable mnemonics, one for each machine instruction. Most assembly language instructions have similarities to words from the English language (e.g. ADD, MOVE, LOAD). However, it is possible that assembly languages are defined in resemblance to other human languages, or none at all. For example, processors designed in and predominantly used in countries with a different language and script might define assembly instructions more familiar and easier to use by its target audience. For example, it is possible that Chinese processors define assembly language instructions without resemblance to English.
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Assembly language uses mnemonic code, abbreviations for machine instructions using a human readable and memorable form. This make it much more readable to humans. For example, one instruction may be called Add, another one may be called Move.These elements are called Machine Code Instruction(s).Machine instructions and their corresponding mnemonic codes are defined for each processor, and are generally unique for each processor family.In addition to mnemonic codes for machine instructions, assembly languages also support directives and pseudo instructions.Directives are used to instruct the assembler how to assemble code. For example, a directive might say "the following code will reside in immutable memory (ROM)," another directive might say "the following code will start at a fixed memory location of address 12345." Examples for directives include common directives such as SEG and ORG. However, the syntax and set of directives are defined by the assembler program and are not standardized.Pseudo-instructions are used to control conditional assembly (e.g. IF, ELSE, ENDIF), definition and use of macros, and other tools that allow efficient programming in assembly.
Only when a high-level language cannot create the desired machine code. This is rarely necessary given that C++ (for example) is specifically designed so that the need to write code in a lower-level language (such as C or assembly) is extremely rare. A typical example is when a new machine architecture is conceived for which there (currently) would be no high-level language implementations available. Given the complexities involved in creating (or modifying) high-level compilers to cater for a new architecture, the manufacturer will initially provide a low-level assembler which is obviously much simpler to implement given the much reduced abstraction involved. Until higher level languages begin to emerge, the assembly language is the only way to program the new architecture.
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Usually PCB factories do not provide assembly work, some companies have partners will provide assembly work.
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Yes, assembly language is definitely still used. Many I/O drivers and much of the bootstrap code that starts a computer must be written in assembly language as high level languages do not provide means for coding certain special purpose instructions needed for these operations. Also high level languages usually require that subroutine library codes be available, while assembly language does not. As these subroutine library codes usually cannot be loaded until the Operating System is up and running, assembly language must be used for much of the code that bootstraps the computer and loads the Operating System.
That depends on who you ask and how far back you go. It could be Intel, it could be whoever designed the ENAIC (used for looking up trajectory tables) but I think it was Charles Babbage, inventor of the 'analytical machine.' More: http://en.wikipedia.org/wiki/Turing_complete
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