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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
Q. Define about EXE Programs? An EXE program is stored on disk with extension .exe. EXE programs are longer than COM programs as every EXE program is related with an EXE header
What is the max no of match code Id's that can be defined for one Match code object? A match code Id is a single character ID that can be a letter or a number.
Q. A. Which gates are called Universal Gates? Why? B. State and prove any one of the DeMorgen's Laws. Show that these theorems can be extended up to any number of variables.
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