The program writing in 8086 is quite different from that
of 8085. Why one may ask?? Well answer to that is first their architecture are
different. Different architecture means different set of instruction code.
Secondly 8086 is a 16 bit processor. Meaning it processes 16bit of data, twice
as much data as the 8085.
There are 2 ways to write a program. One as I say a
simplified segment way other the simple way.
Simplified Segment
|
Simple way
|
Basic Structure
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Basic Structure
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.model model_type
.data data_segment_name
-------
.code code_segment_name
----
----
----
END
|
Data_segment_name SEGMENT
----
----
Data_segment_name ENDS
Code_segment_name SEGMENT
----
----
Code_segment_name ENDS
|
Here we don’t need to end each and
every segment by using ENDS instruction. When compiler detects start of
another segment or meets the instruction END it automatically assumes the end
of the segment.
|
Here every segment needs to ended
properly using Segment ENDS instruction. Failing to do so will raise a syntax
error.
|
Here writing name of data segment or code segment is not
nesscessary. A simple .code and .data will create a local reference type
segment usable in the single file.
|
Here writing the name of data segment and the code
segment is very very essential. The segment created here needs to have a name
without which complier will not be able to differentiate between memory
segmentation. No two segments can have a same name.
|
Here model type is to written as
small, huge, large etc etc…
|
Here model type needn’t to be
mentioned.
|
Rest explanation of program code can be found as comment
along with the program.
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