emulator: Osmose (RetroPie)
type: standalone
core_classification: community_fork
source: "https://github.com/RetroPie/osmose-rpi"
profiled_date: "2026-10-20"
source_commit: "7775add582ad2595e876ca38d4675510f2df866e"
core_version: "0.8.1+rpi20130302"
display_name: "Sega - Master System / Game Gear (Osmose)"
mode: standalone
cores:
  - osmose
systems:
  - sega-master-system
  - sega-game-gear

notes: |
  Bruno Vedder's OsmOse 0.8.1 as ported to the Raspberry Pi by palerider,
  with badman12345's joystick quit option (readme.rpi:1-13,
  Version.h:3). RetroPie builds the tree with make and launches
  osmose with the ROM and -tv -fs.

  The cartridge is mapped directly at reset. No BIOS image is loaded:
  the memory control port handler only prints whether the program
  enables or disables the BIOS ROM.
  ref: IOMapper.cpp:124-131

  The ROM is read as a plain file or as the first entry of a zip
  archive. Battery RAM comes from ./osmose_files/bbr/<rom>.bbr when
  present, and save states, screenshots, tile dumps and sound captures
  are written under ./osmose_files/. The configuration is
  ~/.osmose/osmose.ini, written with defaults when absent. The on
  screen font is the bitmap compiled into TextWriter.cpp.
  ref: MemoryMapper.cpp:120-140, MemoryMapper.cpp:545-553,
       MemoryMapper.cpp:705-712, OsmoseConfiguration.cpp:26-58,
       OsmoseConfiguration.cpp:145, TextWriter.cpp:48

exclusion_note: "no BIOS or system file, the cartridge runs directly"
files: []