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knightmare-cmm2

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A port of the MSX game Knightmare to the CMM2 computer

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# Knightmare MMBasic Version

The MSX Knightmare video game entirely written in MMBasic.

## MSX Knightmare

Knightmare is a 1986 vertically scrolling shooter video game developed and published by Konami for the MSX home computer.

For more about the video game, [Knightmare on Wikipedia](<https://en.wikipedia.org/wiki/Knightmare_(1986_video_game)>)

## MMBasic

MMBasic is a free, fast and open BASIC interpreter for microcontrollers.

It includes floating point numbers, extensive string handling, multi-dimensional arrays, and structured programming features like do loops, multiline if statements, user-defined subroutines, and functions.

See more at the [MMBasic home page](https://mmbasic.com/)

## MMBasic for the CMM2 Computer

The Colour Maximite 2 (CMM2) is a small self contained computer inspired by the home computers of the early 80's such as the Tandy TRS-80, Commodore 64 and Apple II.

It uses a USB keyboard and outputs to a standard VGA monitor. Programs are saved on a full size SD card and it boots straight into its own sophisticated BASIC interpreter with a full screen program editor.

The Colour Maximite 2 is designed to be simple to use, easy to program and provide endless hours of fun.

For more info, please visit [https://geoffg.net/maximite.html](https://geoffg.net/maximite.html)

## MMBasic for Windows

The Windows/DOS version of MMBasic was created to make it easy to evaluate MMBasic. It is a single executable that does not need installation, just double-click on the executable and MMBasic will run in a DOS window on Windows (including Windows 10). It also runs in Linux using [Wine](https://www.winehq.org/).

The executable and documentation can be downloaded from [https://www.thebackshed.com/forum/uploads/matherp/2025-10-02_183145_MMB4WV5.07.03b25.zip](https://www.thebackshed.com/forum/uploads/matherp/2025-10-02_183145_MMB4WV5.07.03b25.zip).

## Running MMBasic Knightmare

After downloading the source code from this repository and executing the MMBasic, you will need to access the directory where the **Knightmare** is located using the command `chdir "dir/for/the/game"`. You can also use the command `files` to list the directory content.

To run the video game use the command `run "km.bas"`

[<img src="images/thumbnail-small.png" width="400px" />](https://youtube.com/playlist?list=PLpx1nOk-DRHy_u9RyLZ5AYdjwFX-UcOje&si=Dn6mccseqbJvQ2Kn "MMBasic Knightmare")

## Maps

Knightmare has a total of 8 different stages, each with its map. The maps were designed using the [Tiled map editor](https://www.mapeditor.org/), a powerful open-source tool for creating video game maps.

I created a [nodejs script](/blob/main/dev/map_converter.js) that converts the exported json map to the binary format used by the game engine.

The binary format is very simple:

```
2 Bytes per tile
0000 0000 0000 0000
|  |      ||-------> 7 bits: Tile Id
|  |      |--------> 1 bit : Solid bit
|  |---------------> 5 bits: Objects, enemies, power-ups
|------------------> 3 bits: Object properties
```

## Special Thank You

I wish to extend a special thank you to [https://www.youtube.com/@HoffmanYouTube](H0ffman) for kindly allowing me to use his reinterpretation of the 1986 Knightmare game songs

## Original MSX Knightmare Screenshots

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