2600.emu - RetroBIOS¶
Technical notes
Android and Linux member of the EX Emulator series by Robert Broglia, published as com.explusalpha.A2600Emu (2600.emu/metadata/conf.mk:2,6,7) and reached by ES-DE through its 2600-EMU find rule. Stella 7.0 is vendored under 2600.emu/src/stella (2600.emu/src/stella/common/Version.hxx:21, identical to the upstream 7.0 tag) and driven by the app's own OSystem, FrameBuffer, EventHandler and Sound.
The console needs no ROM of its own. The Supercharger BIOS is the built-in ourDummyROMCode array, patched at load and copied into the ROM area (2600.emu/src/stella/emucore/CartAR.cxx:263-278).
The build defines EMU_EX_PLATFORM, SOUND_SUPPORT and THUMB_SUPPORT (2600.emu/CMakeLists.txt:22); DEBUGGER_SUPPORT and CHEATCODE_SUPPORT are absent, so the cheat database and the debugger are not compiled. PropertiesSet is constructed on CompositeKeyValueRepositoryNoop (2600.emu/src/stella/emucore/PropsSet.cxx:29-32), so cartridge properties come from the built-in DefProps table and no properties file is read. checkUserPalette returns false and paletteFile returns an empty node (2600.emu/src/OSystemEmuEx.hxx:69-70), which stops PaletteHandler before it opens anything (2600.emu/src/stella/common/PaletteHandler.cxx:405-409). Bezel.cxx and VideoModeHandler are not part of the build.
KidVid needs no menu entry to engage. Both tapes leave the controller columns empty in the properties table (2600.emu/src/stella/emucore/DefProps.hxx:2339,3420), the default AUTO resolves to Type::Unknown (2600.emu/src/stella/emucore/Control.cxx:137-148), and that is the condition ControllerDetector requires before running its right-port signature test (2600.emu/src/stella/emucore/ControllerDetector.cxx:29,90-92,771-780). The controller is then built for either of the two matching cartridge MD5s (2600.emu/src/stella/emucore/Console.cxx:1096-1105, 2600.emu/src/stella/emucore/KidVid.cxx:37-42). The app's own controller list bounds the port 1 option only (2600.emu/src/main/system.ccm:80-93).
OSystem::baseDir hands the file name to EmuSystem::contentFilePath (2600.emu/src/main/OSystem.cc:73-76), which appends it to the content name instead of joining it as a directory entry (EmuFramework/src/EmuSystem.cc: 448-452, EmuFramework/include/emuframework/EmuSystem.hh:213-218), the content name being the ROM file name without its dot extension (EmuFramework/src/EmuSystem.cc:82,91). The tapes are read beside the ROM under that name followed by the file name, as in "Smurfs Save the Day (1983) (Coleco)KVSHARED.WAV". The upstream 7.0 tag builds the same paths as baseDir().getPath() + fileName.
SoundEmuEx leaves playWav, stopWav and wavSize on their base class bodies, which answer false, nothing and zero (2600.emu/src/stella/emucore/Sound.hxx:121-134). The tapes are tested with FSNode::exists and never read, and both games run without them through the timing path in KidVid::setNextSong.
NVRAM is produced by the app. MT24LC256 fills a fresh EEPROM image with INITIAL_VALUE when the file is missing or not 32768 bytes (2600.emu/src/stella/emucore/MT24LC256.cxx:44-68), and the CTY and FA2 cartridge saves take the same route through nvramDir. elf_executable_image.bin is a dump written under the elf.dump setting (2600.emu/src/stella/emucore/CartELF.cxx:155). ui.png, gpOverlay.png and kbOverlay.png are read from the application bundle through openAsset.
7 files | 0 required, 7 optional | 7 in repo, 0 missing Categories: 7 game data
KVSHARED.WAV optional in repo game_data
KidVid Voice Module shared samples, tested for both games
- System: atari-2600
- Source:
2600.emu/src/stella/emucore/KidVid.cxx:273,2600.emu/src/stella/emucore/KidVid.cxx:299
KVS1.WAV optional in repo game_data
KidVid tape for Smurfs Save the Day, Harmony Smurf
- System: atari-2600
- Source:
2600.emu/src/stella/emucore/KidVid.cxx:244,2600.emu/src/stella/emucore/KidVid.cxx:247-249,2600.emu/src/stella/emucore/KidVid.cxx:272
KVS2.WAV optional in repo game_data
KidVid tape for Smurfs Save the Day, Handy Smurf
- System: atari-2600
- Source:
2600.emu/src/stella/emucore/KidVid.cxx:244,2600.emu/src/stella/emucore/KidVid.cxx:247-249,2600.emu/src/stella/emucore/KidVid.cxx:272
KVS3.WAV optional in repo game_data
KidVid tape for Smurfs Save the Day, Greedy Smurf
- System: atari-2600
- Source:
2600.emu/src/stella/emucore/KidVid.cxx:244,2600.emu/src/stella/emucore/KidVid.cxx:247-249,2600.emu/src/stella/emucore/KidVid.cxx:272
KVB1.WAV optional in repo game_data
KidVid tape for Berenstain Bears, Big Number Hunt
- System: atari-2600
- Source:
2600.emu/src/stella/emucore/KidVid.cxx:245,2600.emu/src/stella/emucore/KidVid.cxx:247-249,2600.emu/src/stella/emucore/KidVid.cxx:272
KVB2.WAV optional in repo game_data
KidVid tape for Berenstain Bears, Great Letter Roundup
- System: atari-2600
- Source:
2600.emu/src/stella/emucore/KidVid.cxx:245,2600.emu/src/stella/emucore/KidVid.cxx:247-249,2600.emu/src/stella/emucore/KidVid.cxx:272
KVB3.WAV optional in repo game_data
KidVid tape for Berenstain Bears, Spooky Spelling Bee
- System: atari-2600
- Source:
2600.emu/src/stella/emucore/KidVid.cxx:245,2600.emu/src/stella/emucore/KidVid.cxx:247-249,2600.emu/src/stella/emucore/KidVid.cxx:272
Generated on 2026-08-23T16:12:05Z