Motorola 68000 Simulator

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Motorola 68000 Simulator

• Alireza Fathi

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Advanced programming Computer organization are
mixed

• Object oriented programming
• Knowledge of what happens in MC68K
• More than 200kb code
• UML class definition
• Visual simulator involved
• And lots of other things

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• This program has an editor that the source code
  will be written in it
• This program is available to order the source
  code ,read it and correct it ,and defines if it
  will have errors
• Then the source code will be compiled and
  executed and client can see the changing of the
  registers and memory units in the Visual
  Simulator Dialog box
• You can see all the available parts of the MC68K
  microprocessor

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Parts of a MC68000

• 1- The visible part
• 2- The invisible part
• It is clear that in this program it is only
  available to see the visible parts as listed in
  the next page

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Visible parts of MC68000

• A0 ? A7 .. A7 SP
• D0 ? D7
• SR
• PC
• Memory Units of main memory
• Condition codes

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Defining the implementation of the program with
C

• I have lots of classes and methods(functions)
  that I will describe during the text

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Class work_Base

• This class works with the different bases
• Specially with decimal ,binary ,octal and hex
• It is included in all other classes
• For working with integers and registers

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Abstract class MemoryHouse

• It is an abstract class that has some childs as
  below
• 1- Class byteHouse
• 2- Class wordHouse
• 3- Class longWordHouse

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Usage of these classes

• Every memory unit or register is a memory house
• They could be byte , word or longword
• All of them can contain some thing
• All of them can point to some where
• And .

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Class Stack

• This class is defined for simulating the stack of
  a computer
• At first I wanted to implement this class from
  the library but really it would not work
• Then I defined it my self

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Class Computer

• This class contains static members and is used to
  simulate the processor
• It has all the components that a motorola 68000
  has
• This class when is used , uses lots of RAM memory
  
• It has 16 Mb of Memory only for simulating the
  memory units in the program

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Class MAINCLASS

• As it is shown with the name of this class it is
  the main class and uses all expressed classes
• Its main job is to give a line of assembly code
  then
• 1-order it
• 2-define if it is correct or not
• 3-if yes executes the instruction

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Class inst_list

• Contains all the MC68K instructions and types

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Class build

• This class is used for executing the instructions

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Last words!!!

• In my idea this program has a good design
• I have written it to the middle 5 or 6 times but
  suddenly I recognized a better design and I
  started again
• Due to not being relative with visual c it took
  a lot too learn it
• I really tried to use the style of Deitel book in
  my codes

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Last words!!!

• It took a time to understand how the MC68K
  instructions work and how they affect on the
  condition codes and other registers
• I can promise you that you can not find any
  source for this program in the internet in c
• I have used lots of c contexts like

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Last words!!!

• Pointers
• References
• Object oriented programming
• Inheritance and polymorphism
• Stack

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Last words!!!

• There are lots of files and classes that show how
  much disciplined this project is
• I tried to simulate MC68K only with its
  components and dont use other things
• And I wasted lots of time for painting Icons
  ,Toolbars and other things

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Used Resources

• Visual c 6 (Microsoft publication)
• C (Deitel , Original)
• Computer Organization (Hamacher)
• MC68K programming
• Lots of internet sources for MC68K
• UML with rational rose 98
• A Complete guide to programming in c