Some students form legal study groups where one student (with instructor permission) shares answer keys for peer review. Always check your school’s academic integrity policy first.
Ensure you are looking at the correct version, as content varies between them: Silver Edition (2007) : Often used in standard intermediate ESL courses. Diamond Edition (2012)
For multiple-choice questions, eliminate obviously wrong options by finding textual evidence. Even without a key, you can often determine correctness by whether the text explicitly supports the choice.
| Source | Legality | Reliability | |--------|----------|-------------| | McGraw-Hill Instructor Portal (after verification) | ✅ Legal | High | | Course instructor via LMS (Canvas, Blackboard) | ✅ Legal | High | | Free PDF sharing sites (Scribd, Academia, Course Hero) | ⚠️ Often copyright violation | Low to Medium | | Library reserve (physical copy only) | ✅ Legal | Medium |
In this comprehensive article, we will explore what the Interaction 2 Reading series offers, why the answer key is so crucial, how to locate legitimate PDF versions, how to use the key effectively for learning (not just cheating), and alternatives for both students and teachers.
This LMC simulator is based on the Little Man Computer (LMC) model of a computer, created by Dr. Stuart Madnick in 1965. LMC is generally used for educational purposes as it models a simple Von Neumann architecture computer which has all of the basic features of a modern computer. It is programmed using assembly code. You can find out more about this model on this wikipedia page.
You can read more about this LMC simulator on 101Computing.net.
Note that in the following table “xx” refers to a memory address (aka mailbox) in the RAM. The online LMC simulator has 100 different mailboxes in the RAM ranging from 00 to 99.
| Mnemonic | Name | Description | Op Code |
| INP | INPUT | Retrieve user input and stores it in the accumulator. | 901 |
| OUT | OUTPUT | Output the value stored in the accumulator. | 902 |
| LDA | LOAD | Load the Accumulator with the contents of the memory address given. | 5xx |
| STA | STORE | Store the value in the Accumulator in the memory address given. | 3xx |
| ADD | ADD | Add the contents of the memory address to the Accumulator | 1xx |
| SUB | SUBTRACT | Subtract the contents of the memory address from the Accumulator | 2xx |
| BRP | BRANCH IF POSITIVE | Branch/Jump to the address given if the Accumulator is zero or positive. | 8xx |
| BRZ | BRANCH IF ZERO | Branch/Jump to the address given if the Accumulator is zero. | 7xx |
| BRA | BRANCH ALWAYS | Branch/Jump to the address given. | 6xx |
| HLT | HALT | Stop the code | 000 |
| DAT | DATA LOCATION | Used to associate a label to a free memory address. An optional value can also be used to be stored at the memory address. |