Define com programs, Computer Engineering

Assignment Help:

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


Related Discussions:- Define com programs

What are prefetch instructions, What are prefetch instructions? Prefetc...

What are prefetch instructions? Prefetch instructions are those instructions which can be inserted into a program either by the programmer or by the compiler.

What is load-through or early restart, What is load-through or early restar...

What is load-through or early restart? When a read miss happens for a system with cache the needed word may be sent to the processor as soon as it is read from the main memory

What are the roll and page areas, What are the roll and page areas? Ro...

What are the roll and page areas? Roll and page areas are SAP R/3 buffers used to kept user contexts (process requests).  The SAP dispatcher assigns procedure requests to work

Organization structure, organization stucture of vardhman and oswal mills.c...

organization stucture of vardhman and oswal mills.compare and contrast them

Calculate the switching elements in a two stage network, In a two stage ne...

In a two stage network there are 512 inlets and outlets, r=s=24. If the probability that a given inlet is active is 0.8, calculate: the switching elements Given: N =M =512,

Indirect addressing mode - assembly language, Indirect addressing mode - as...

Indirect addressing mode - assembly language: The Indirect addressing mode and the address field of the instruction refers to the address of a word in memory, which in turn co

Function of in network access layer in tcp/ip protocol stack, What is the f...

What is the function of in network access layer in TCP/IP protocol stack? Function of Network Access Layer: The network access layer is the lowest layer within Internet

What are packages, What are packages? Package is a group of elements (c...

What are packages? Package is a group of elements (classes, generalizations, associations and lesser packages) with a common theme. Package partitions a model making it simpler

Explain how sap gui handles output screen for the user, Explain how SAP GUI...

Explain how SAP GUI handles output screen for the user. The SAP front-end s/w can either run on the similar computer or on dissimilar computers given for that purpose.  User t

Meaning of every field in mips instruction, Q. Meaning of every field in MI...

Q. Meaning of every field in MIPS instruction? The meaning of every field in MIPS instruction is given below: op: operation code or opcode rs: First register source

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd