An emulator, assembler, and disassembler for the Sega Game Gear
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  1. crater
  2. ======
  3. **crater** is an emulator for the [Sega Game Gear][game gear], with an included
  4. [Z80][z80] assembler/disassembler, written in C.
  5. [game gear]: https://en.wikipedia.org/wiki/Sega_Game_Gear
  6. [z80]: https://en.wikipedia.org/wiki/Zilog_Z80
  7. Why?
  8. ----
  9. While the internet is full of emulators for retro game systems, writing one is
  10. nevertheless a fun learning project.
  11. crater is named after [31 Crateris][crateris], a star that was – for a short
  12. time in 1974 – misidentified as [a moon of Mercury][moon]. Mercury was Sega's
  13. codename for the Game Gear during development.
  14. [crateris]: http://www.astrostudio.org/xhip.php?hip=58587
  15. [moon]: https://en.wikipedia.org/wiki/Mercury%27s_moon
  16. Installing
  17. ----------
  18. Only OS X and Linux are tested. You'll need a modern compiler that supports C11
  19. (clang preferred) and SDL 2. Using Homebrew, you can `brew install sdl2`; using
  20. apt, you can `apt-get install libsdl2-dev`.
  21. Run `make` to create `./crater`. To build the development version with debug
  22. symbols (they can exist simultaneously), run `make DEBUG=1`, which creates
  23. `./crater-dev`. This also enables the printing of debugging info to stdout.
  24. Usage
  25. -----
  26. Running `./crater` without arguments will display a list of ROM images located
  27. in the `roms/` directory, and then ask the user to pick one, or enter their own
  28. ROM path. You can provide a path directly with `./crater path/to/rom`.
  29. Add or symlink ROMs to `roms/` at your leisure. Note that they must end in
  30. `.gg` or `.bin` to be auto-detected.
  31. Add `--fullscreen` (`-f`) to enable fullscreen mode, or `--scale <n>`
  32. (`-s <n>`) to scale the game screen by an integer factor.
  33. Add `--debug` (`-g`) to display detailed information about emulation state
  34. while running, including register values and memory contents. You can also
  35. pause emulation to set breakpoints and change state.
  36. `./crater -h` gives (fairly basic) command-line usage, and `./crater -v` gives
  37. the current version.
  38. ### Assembler/Disassembler
  39. crater has built-in support for converting Z80 assembly into ROM images, as
  40. well as attempting the reverse process (i.e., disassembling).
  41. `--assemble <input> [<output>]` (`-a`) converts source code into a `.gg` binary
  42. that can be run by crater. `--disassemble <input> [<output>]` (`-d`) executes
  43. the opposite operation. If no output file is given, crater will use the name of
  44. the input file, with the extension replaced with `.gg` for `-a` and `.asm` for
  45. `-d`. By default, this will never overwrite the original filename; pass
  46. `--overwrite` (`-r`) to let crater do so.