# SPIM

> MIPS emulator

**Wikidata**: [Q1137323](https://www.wikidata.org/wiki/Q1137323)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/SPIM)  
**Source**: https://4ort.xyz/entity/spim

## Summary
SPIM is a free software MIPS emulator developed by James Larus. It enables users to run MIPS assembly language programs on non-MIPS platforms like x86 and ARM computers.

## Key Facts
-   **Developer:** Created by James Larus, an American computer scientist (born September 15, 1958).
-   **License:** Distributed under the 3-clause BSD License.
-   **Version:** Current version is 9.1 (as per the official changes page).
-   **Software Classification:** Classified as free software, a virtual machine, and platform virtualization software.
-   **Primary Purpose:** Simulates the MIPS architecture, allowing execution of MIPS assembly code on other computer architectures.
-   **Website:** http://spimsimulator.sourceforge.net/ and https://pages.cs.wisc.edu/~larus/spim.html (English).
-   **Distribution Available:** Packaged for Gentoo (app-emulation/spim), Debian Stable (spim), macOS Homebrew (spim), and MacPorts (spim).
-   **Project Host:** Hosted on SourceForge as the "spimsimulator" project.
-   **First Release:** Developed in the early 1990s.

## FAQs
### Q: What is SPIM used for?
A: SPIM is primarily used for educational purposes, allowing students and programmers to learn and test MIPS assembly language programs without needing access to actual MIPS hardware.

### Q: Is SPIM free software?
A: Yes, SPIM is free software distributed under the permissive 3-clause BSD License, which allows users to freely run, study, modify, and redistribute it.

### Q: Where can I download SPIM?
A: SPIM can be downloaded directly from its SourceForge project page (http://spimsimulator.sourceforge.net/) or installed via package managers like Gentoo, Debian, Homebrew, or MacPorts.

### Q: Who created SPIM?
A: SPIM was developed by James Larus, an American computer scientist and professor.

### Q: What MIPS versions does SPIM emulate?
A: SPIM emulates a subset of the MIPS I architecture, sufficient for running common MIPS assembly programs used in education and for the R2000/R3000 processors.

## Why It Matters
SPIM holds significant importance in computer science education, particularly for teaching computer architecture and assembly language programming. By providing a free and accessible emulator for the MIPS architecture, it removes the barrier of requiring specialized hardware. This democratized access has enabled countless students worldwide to gain practical experience with assembly language, understand processor design concepts, and debug code at the hardware level. Its long history spanning decades underscores its reliability and enduring value as an educational tool. The open-source BSD license further ensures its continued availability and adaptability for learning and research.

## Notable For
-   **Educational Pioneer:** One of the earliest and most widely adopted free emulators specifically designed for MIPS architecture instruction.
-   **Longevity:** Continuously developed and used since the early 1990s, demonstrating sustained relevance in academia.
-   **Permissive Licensing:** Its use of the 3-clause BSD license allows for significant freedom in use, modification, and distribution, fostering its adoption in educational environments.
-   **Architecture Focus:** Provides a faithful simulation of the MIPS I instruction set, a cornerstone architecture in computer science curricula.

## Body

### Overview
SPIM is a software emulator that simulates the functionality of the MIPS architecture. It allows MIPS assembly programs written for the MIPS I instruction set to be executed on non-MIPS systems such as x86 and ARM computers. SPIM is a foundational tool for learning computer architecture and assembly programming.

### Development
-   **Creator:** Developed by James Larus, an American computer scientist and academic.
-   **History:** First released in the early 1990s. The project has been actively maintained over the years.
-   **Repository:** Hosted on SourceForge under the project name "spimsimulator".

### Licensing
-   **License Type:** 3-clause BSD License.
-   **Classification:** Explicitly categorized as free software.

### Version History
-   **Latest Version:** Version 9.1.
-   **Version Tracking:** Changelogs detailing updates are available on the official website and via the Internet Archive.

### Distribution & Availability
-   **Official Website:** http://spimsimulator.sourceforge.net/
-   **Secondary Site:** https://pages.cs.wisc.edu/~larus/spim.html (English language).
-   **Package Managers:**
    -   Gentoo: `app-emulation/spim`
    -   Debian Stable: `spim`
    -   macOS Homebrew: `spim`
    -   MacPorts: `spim`
-   **Package Repositories:** Listed in Repology as "spim".
-   **Notable Alias:** Also known as PCSpim.

## References

1. [official website](http://spimsimulator.sourceforge.net/)
2. [Changes to Spim](http://spimsimulator.sourceforge.net/changes.html)
3. Freebase Data Dumps. 2013