Magnavox - Odyssey2 / Phillips Videopac+ (O2EM)¶
Background¶
O2EM is an open source multi-platform Odyssey2 / Videopac+ emulator. The Odyssey2 (Videopac/Jopac in Europe) was a video game console created in the late 70s.
The O2EM core has been authored by
- Daniel Boris
- Andre de la Rocha
- Arlindo M. de Oliveira
The O2EM core is licensed under
A summary of the licenses behind RetroArch and its cores have found here.
BIOS¶
Required or optional firmware files go in the frontend's system directory.
| Filename | Description | md5sum |
|---|---|---|
| o2rom.bin | Odyssey2 BIOS - G7000 model - Required | 562d5ebf9e030a40d6fabfc2f33139fd |
| c52.bin | Videopac+ French BIOS - G7000 model - Required | f1071cdb0b6b10dde94d3bc8a6146387 |
| g7400.bin | Videopac+ European BIOS - G7400 model - Required | c500ff71236068e0dc0d0603d265ae76 |
| jopac.bin | Videopac+ French BIOS - G7400 model - Required | 279008e4a0db2dc5f1c048853b033828 |
Currently the libretro core only works with the o2rom.bin. As a workaround for playing Videopac+ games, you can rename the g7400.bin firmware file into o2rom.bin, and the core plays it correctly as a Videopac+ game.
Extensions¶
Content that can be loaded by the O2EM core have the following file extensions:
- .bin
RetroArch database(s) that are associated with the O2EM core:
Features¶
Frontend-level settings or features that the O2EM core respects.
| Feature | Supported |
|---|---|
| Restart | ✔ |
| Saves | ✕ |
| States | ✔ |
| Rewind | ✕ |
| Netplay | ✕ |
| Core Options | ✕ |
| RetroAchievements | ✕ |
| RetroArch Cheats | ✕ |
| Native Cheats | ✕ |
| Controls | ✔ |
| Remapping | ✔ |
| Multi-Mouse | ✕ |
| Rumble | ✕ |
| Sensors | ✕ |
| Camera | ✕ |
| Location | ✕ |
| Subsystem | ✕ |
| Softpatching | ✕ |
| Disk Control | ✕ |
| Username | ✕ |
| Language | ✕ |
| Crop Overscan | ✕ |
| LEDs | ✕ |
Directories¶
The O2EM core's library name is 'O2EM'
The O2EM core saves/loads to/from these directories.
Frontend's State directory
| File | Description |
|---|---|
| *.state# | State |
Geometry and timing¶
- The O2EM core's core provided FPS is 60 for NTSC games and 50 for PAL games
- The O2EM core's core provided sample rate is 44100 Hz
- The O2EM core's base width is 340
- The O2EM core's base height is 250
- The O2EM core's max width is 340
- The O2EM core's max height is 250
- The O2EM core's core provided aspect ratio is 4/3
Joypad¶
| RetroPad Inputs | User 1 input descriptors |
|---|---|
 |
1 |
 |
Up |
 |
Down |
 |
Left |
 |
Right |
 |
Fire |
 |
2 |
 |
3 |
 |
4 |
| RetroPad Inputs | User 2 input descriptors |
|---|---|
|
Up |
|
Down |
|
Left |
|
Right |
|
Action |
In some games, for example UFO/Satellite Attack, the original had the joypads swapped so that Player 1 was on Joypad 2. If you only use one Joypad, a workaround is to provide identical assignments of both Retropads to one joystick and save it as Game Remap or Core Remap.
Keyboard¶
| RetroKeyboard Inputs | O2EM Inputs |
|---|---|
| Keyboard Return | Enter |
| Keyboard Space | Space |
| Keyboard Minus - | - |
| Keyboard Period . | . |
| Keyboard Slash / | / |
| Keyboard 0 | 0 |
| Keyboard 1 | 1 |
| Keyboard 2 | 2 |
| Keyboard 3 | 3 |
| Keyboard 4 | 4 |
| Keyboard 5 | 5 |
| Keyboard 6 | 6 |
| Keyboard 7 | 7 |
| Keyboard 8 | 8 |
| Keyboard 9 | 9 |
| Keyboard Equals = | = |
| Keyboard Question ? | ? |
| Keyboard a | a |
| Keyboard b | b |
| Keyboard c | c |
| Keyboard d | d |
| Keyboard e | e |
| Keyboard f | f |
| Keyboard g | g |
| Keyboard h | h |
| Keyboard i | i |
| Keyboard j | j |
| Keyboard k | k |
| Keyboard l | l |
| Keyboard m | m |
| Keyboard n | n |
| Keyboard o | o |
| Keyboard p | p |
| Keyboard q | q |
| Keyboard r | r |
| Keyboard s | s |
| Keyboard t | t |
| Keyboard u | u |
| Keyboard v | v |
| Keyboard w | w |
| Keyboard x | x |
| Keyboard y | y |
| Keyboard z | z |
| Keyboard End | Clear |