An Intel 8080 assembler and online simulator

栏目: IT技术 · 发布时间: 4年前

内容简介:While going through Charles Petzold's "Code" book again, I was looking for an easy-to-use online assembler and simulator for the classicSo I ended up rolling my own, and theIf you want to play with the simulator, a live version is available online at

While going through Charles Petzold's "Code" book again, I was looking for an easy-to-use online assembler and simulator for the classic Intel 8080 CPU , but couldn't find anything that fit my needs exactly. There are some well-done tools out there, but they seem to be more geared to running game ROMs and earge programs on an emulator; my need was different - I just wanted something to play with, to practice 8080 assembly programming.

So I ended up rolling my own, and the js-8080-sim project was born. The project has three main parts:

  • An assembler for the 8080: translating assembly language code into 8080 machine code. I wrote a custom assembler for this.
  • A CPU simulator: simulating 8080 machine code. For this purpose I cloned the maly/8080js project into my repositoryand tweaked it a little bit.
  • A simple web UI for writing 8080 assembly code, running it and observing the results (as changed values in memory and registers). I wrote a basic UI in JS:
An Intel 8080 assembler and online simulator

If you want to play with the simulator, a live version is available online at https://eliben.org/js8080

The UI is purely client-side; it makes no requests and just uses your browser as a GUI. It does use the browser's local storage to save the last program you ran.

Issues and PRs on Github welcome!

On JavaScript and frameworks

Using JS for a project like this is very natural, because ultimately what I'm interested in is having a convenient web UI to play with the simulator. When I do this, I almost always end up writing vanilla HTML+CSS+JS, avoiding frameworks. I don't write JS often, so whenever I get to work on a new project, the framework do juor has typically changed from the last time, and I just don't have the time to keep track. Vanilla HTML+CSS+JS has much better longevity, IMHO, although it does mean somewhat more manual work (e.g. to keep the UI in sync with the application state).

The only framework I was tempted to use is Bootstrap for the CSS and layout, but eventually decided against it in the interest of simplicity.

We're fortunate to have much more stable and usable JS and web APIs in 2020 compared to just a few years ago. For the simulator I've been using the ES6 version of JS, which is widely supported today and offers many niceties.

I went with vendoring 8080js because it appears to be unmaintained, and I also wanted to avoid a dependency, preferring the project to be self-contained. This was easy with 8080js because it's a single JS file and it has a permissive 2-clause BSD license. I've reproduced the license in full in the cloned source file. FWIW, 8080js itself is also based on an earlier BSD-licensed simuator; OSS at its best :-)

以上就是本文的全部内容,希望本文的内容对大家的学习或者工作能带来一定的帮助,也希望大家多多支持 码农网

查看所有标签

猜你喜欢:

本站部分资源来源于网络,本站转载出于传递更多信息之目的,版权归原作者或者来源机构所有,如转载稿涉及版权问题,请联系我们

创新者的解答

创新者的解答

【美】克莱顿•克里斯坦森、【加】迈克尔·雷纳 / 中信出版社 / 2013-10-10 / 49.00

《创新者的解答》讲述为了追求创新成长机会,美国电信巨子AT&T在短短10年间,总共耗费了500亿美元。企业为了保持成功记录,会面对成长的压力以达成持续获利的目标。但是如果追求成长的方向出现偏误,后果往往比没有成长更糟。因此,如何创新,并选对正确方向,是每个企业最大的难题。 因此,如何创新,并导向何种方向,便在于创新结果的可预测性─而此可预测性则来自于正确的理论依据。在《创新者的解答》中,两位......一起来看看 《创新者的解答》 这本书的介绍吧!

CSS 压缩/解压工具
CSS 压缩/解压工具

在线压缩/解压 CSS 代码

HEX CMYK 转换工具
HEX CMYK 转换工具

HEX CMYK 互转工具

HSV CMYK 转换工具
HSV CMYK 转换工具

HSV CMYK互换工具