Genesis

Minimal OS written in Jack.

Build

Tested on Ubuntu 20.04.

Clone the repository.

git clone https://github.com/abhaynayar/genesis

For the compilation, translation and assembling of Jack programs, you need
Python.

For the CPU emulator, you need
pygame.

Build and run the project using:

./run.sh

What the build script does:

• Compiles the *.jack files in kernel/ and userland/ directories.
• Copies the VM files to the build/ directory.
• Translates the compiled VM code to Hack assembly. build/out.asm
• Assembles the Hack assembly code to machine code. build/out.hack
• Runs the machine code on the CPU emulator.

Docs

• Introduction
• Architecture
• Memory Layout
• Interrupts
• File System

Todo

Applications

• Text Editor.
  • SHIFT key support.
  • Fix backspace quirks.
  • Hold key for multi-input.
• Chip8 Interpreter.
• GUI Toolkit.

Language

• For loops.
• Hex numbers.
• If-else ladders.
• Shift operations.
• Switch statements.
• Declare variables anywhere.
• Code coverage.
• Error handling.
• Inline assembly.
• Coding style guide.
• Modulo operator.
• XOR operations.

System

• File System.
• C++ Emulator.
• Sound Support.
• Network Stack.
• Timer Interrupts.
• Shell Text Buffer.
• Keyboard Interrupts.
• Hardware-based CPU emulator. (n2t-wasm)

Misc.

• Fonts with transparent backgrounds.
• Terminate compiler and shell script on error.
• Check if Hack file is 64-bit before emulating.
• Print string and newline in the same function.
• Check if pixel is already set, if yes then don’t update.
• Output multiple files from assembler; concat them in the build script.
• Why does XOR only work with a space? => Was not added in JackType.symbols[].