Moore Machine

Moore Machine

In this type of machine, the future state Sj of the machine is decided by the current state and current input symbol of the machine. 

The output symbol at a given time depends only on the present state of the machine.

Moore machine is defined as a 6 tuple (Q, Σ, ∆, δ, λ, q0). 


Q is a finite set of states. 

Σ is the input alphabet. 

∆ is the output alphabet. 

δ is the transition function which maps Σ × Q to Q. 

λ is the output function mapping Q to ∆.

q0 is the initial state.

For example, 

Moore machine is as follows:

Present state

Next state


a = 0

a = 1













Moore Machine
Transition Diagram

In Moore machine, each state has its fixed output i.e. in above diagram, 
  • When machine is in state q1, the output is 0.
  • When machine is in state q2, the output is 0.
  • When machine is in state q3, the output is 1. 
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Previous years solved papers:
A list of Video lectures References:
  1. Sebesta,”Concept of programming Language”, Pearson Edu 
  2. Louden, “Programming Languages: Principles & Practices” , Cengage Learning 
  3. Tucker, “Programming Languages: Principles and paradigms “, Tata McGraw –Hill. 
  4. E Horowitz, "Programming Languages", 2nd Edition, Addison Wesley

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    8. Register in Assembly Language Programming
    9. Arrays in Assembly Language Programming


    1. William stalling ,“Computer Architecture and Organization” PHI
    2. Morris Mano , “Computer System Organization ”PHI

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    7. Error control in data link layer
    8. Stop and Wait scheme
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    10. One bit sliding window protocol
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    13. Application layer
    1. Andrew S. Tanenbaum, David J. Wetherall, “Computer Networks” Pearson Education.
    2. Douglas E Comer, “Internetworking with TCP/IP Principles, Protocols, And Architecture",Pearson Education
    3. KavehPahlavan, Prashant Krishnamurthy, “Networking Fundamentals”, Wiley Publication.
    4. Ying-Dar Lin, Ren-Hung Hwang, Fred Baker, “Computer Networks: An Open Source Approach”, McGraw Hill.