Retrokern is a 16-bit x86 assembly-based "operating system" that aims to accomplish the following goals:

• Provide a teaching platform for x86 assembly
• Provide a simple non-DOS, completely free operating system for retro projects

This system requires absolutely no operating system and will boot (in theory) in any 8086 or later CPU, including modern x86_64 systems.

Learn more at Retorkern - A Modern Thin Retro Assembly Platform

In game.asm a reference "game" is included. This isn't really a game, rather just code to display a character avatar and loop. Depending on key input, the character moves and player_x and player_y are updated.

The point of this code is to demonstrate the functionality available to a game or program using Retrokern.

Written by Robert W. Oliver II [email protected] Copyright (C) 2018 Sourcerer, All Rights Reserved.

Licensed under the GPLv3.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

Retrokern was inspired and borrows some code from Mihail Szabolcs's FloppyBird DOS/Assembly game. https://github.com/icebreaker/floppybird/

The author would like to thank Sourcerer for inspiration, support, and promotion.