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assembly language is fundamentally the local language of your computer. in principle the processor of your machine understands machine code
the skill of assembly language programming aoa randy hyde3939s acclaimed text on assembly language programming is the most-frequently
this web page looks at assembly languages in a common method. specific illustrations of addressing modes and instructions from a variety of
the technique to mix c and assembly language is to apply the quotasmquot directive. to access c-language variables from assembly language you just
one of the facilities that the use of macros provides is the formation of libraries which are sets of macros which can be included in a program from
the divisions which make a macro are declaration of the macro code of the macro macro termination directive the assertion of the
definition of the macro a macro is a collection of repetitive instructions in a program which are codified only one time and can be used as many
there are two kinds of procedures the intrasegments which are found on the similar segment of instructions and the inter-segments which can be stored
a procedure is a compilation of instructions to which we can express the flow of our program and once the execution of these instructions is
the use of manage files very much facilitates the creation of files and programmer can focus on other aspects of the programming lacking worrying on
the 21h function and the 22h function of the 21h interruption are the ones in charge of realizing the random readings and writings in that order. the
earlier than anything we must describe the file transfer area or dta. with the intention of sequentially read we use the 14h function of the
previous to we can perform writing to the disk it is essential to define the data transfer region using for this end the 1ah function of the
creating a new file for the formation of files the 21h interruption 16h function is used. dx must identify a control structure whose necessities
opening files 0fh function is used to open an fcb file the 21h interruption. the element the name and extension of the file must be initialized
there are two kinds of fcb the normal whose length is 37 bytes and the expanded one of 44 bytes. the fcb is created of data given by the
there are two methods to work with files the first one is through file control blocks or quotfcbquot and the second one is through
software interruptions can be thoroughly activated by the assembler invoking the number of the preferred interruption with the int
external interruptions are produced by peripheral devices for example keyboards printers communication cards etc. they are also produced by
internal interruptions are produced by convinced events which come during the execution of a program. these types of interruptions are handled
they are used to reduce or enlarge the content of the counters. dec inc dec instruction idea to diminish the
they straightforwardly affect the content of the flags. clc cld cli cmc stc std sti clc
they are used to evaluate operators and they have an effect on the content of the flags. cmp cmps cmpsb cmpsw cmp
they transfer the process flow provisionally or totally to a destiny replicating this action until the counter is