DOS 8086 Assembly Demos

This repository contains a collection of very small and simple 8086 assembly programs for MS-DOS type of computers. These programs perform a single task which would normally be embedded into a larger program.

Overview

• helloworld: Prints "Hello World!" to the screen
• printdot: Enters VGA mode and prints all VGA colors in a 16 x 16 grid
• fileio: Open a file and read its contents which is shown on the terminal screen
• image: Load an image file and show it on the screen
• crc16: Perform a CRC16 on a small snippet of data
• savefile: Save a snippet of data to a file

Screenshots

Screen shot of printdot program:

Screen shot of image program:

Requirements

Install the required emulator and cross-compiler / assembler via the instruction below.

sudo apt install -y dosbox bcc nasm build-essential

Compiling and running

To compile and run any of the examples, go the respective folder and run

make && make run

Scripts

The folder vga-palette contains a simple Python script to convert .png files (24 bpp) to the VGA palette (8 bpp).