The repository shows the compiler (simulator) of the Little Man Computer, which also contains some programs in the LMC programming language for implementing different functions.

Related tags

Learning resource little-man-computer
Overview

Little Man Computer

The repository shows the compiler (simulator) of the Little Man Computer, which also contains some programs in the LMC programming language for implementing different functions.

About Little Man Computer

The Little Man Computer (LMC) is an instructional model of a computer, created by Dr. Stuart Madnick in 1965. The LMC is generally used to teach students because it models a simple von Neumann architecture computer—which has all the basic features of a modern computer. It can be programmed in machine code (albeit in decimal rather than binary) or assembly code.

Please visit the Wikipedia of Little Man Computer for more information.

How to run the LMC program

  1. Open the HTML page via your browser
    1. The upper left-hand part is the input box for inputting the codes
    2. The upper right-hand part is the components of the Little Man Computer
    3. The lower part is the result board for showing the result of your program
  2. Copy the sample programs or input your code in the input box
  3. Click the Compile & mount button to compile the LMC code in the input box
  4. Click the Run! button to run the code

    You can see how the program runs in the components

  5. Get the calculation result in the result board
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Comments
  • Line numbers wrong in compile view for data fields

    Line numbers wrong in compile view for data fields

    In compile view the line numbers are calculated automatically and start with a 1. That leads to a wrong code view as the first line should have the number 0 (LMC counts from 00 to 99). Therefore references in the compiled code view lead at least to wrong data boxes. See the following example where the jump labels are correct but the references to the variable data box are not:

    image

    I suggest using an offset of 0 for the line number counting and maybe even use two digits in order to follow LMCs internal opcode based logic.

    opened by leitmedium 1
  • After corrected line numbers, internal numbering seems broken

    After corrected line numbers, internal numbering seems broken

    Thanks for the fix of #1 - now there seems to be a regression that leads to internally wrong addresses line numbers. The following code worked before #1 had been fixed:

    START INP
      BRZ END
      ADD X
      STA X
      OUT
      BRP START
END   HLT
X     DAT 0

    Now it ends in an endless loop. Apparently because the jump for "BRP START" jumps directly to "BRZ END" and not to the START line. My strong assumption is that this is still a side effect of the numbering system. While on the right hand side we see that the programm counter starts with "00" (which is correct for LMC) on the left hand code is being rendered with numbers being based on a start with 1. I still think the best would be to completely switch over to start counting at 0 everywhere.

    (this reminds me of the computer joke: »There are 2 hard problems in computer science: cache invalidation, naming things, and off-by-1 errors.«)

    Thanks for the great work!

    opened by leitmedium 0
Owner
Cow Cheng
Use our hands to change the world.
Cow Cheng
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