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Q. Define COM Programs?
A COM (Command) program is binary image of a machine language program. It is loaded in memory at the lowest available segment address. Program code starts at an offset 100h, the first 1K locations being occupied by IVT.
A COM program keeps itsdata, code and stack segments within same segment. Because the offsets in a physical segment can be of 16 bits hence size of COM program is limited to 216 = 64K that involvesdata, code and stack. The subsequent program displays a COM program:
; Title add two numbers as well as store result and carry in memory variables.
; name of segment in this program is chosen to be CSEG
Which loader is executed when a system is first turned on or restarted? Ans. Bootstrap loader executed while a system is first turned on or restarted.
Q. Explain Programmer Visible Registers? These registers can be accessed employing machine language. In general we encounter four kinds of programmer visible registers.
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