Theodore is a Thomson MO/TO system emulator based on Daniel Coulom's DCTO8D/DCTO9P/DCMO5 emulators. It emulates all the main models of the MO/TO family: TO7, TO7/70, TO8, TO8D, TO9, TO9+, MO5 and MO6. It also emulates the Olivetti Prodest PC128.

  • Theodore supports the following models:

Theodore is licensed under GPLv3.

  • Theodore supports the following file extensions:
  • Theodore supports the following features:
  • Theodore does not support the following features:

The Theodore core's base resolution is 672x432 pixels.

Theodore has the following core options:

The default input devices for Theodore are RetroPad and RetroPad w/ Analog.

Theodore has the following keyboard mappings:

Theodore has the following mouse mappings:

Evidence and publication details

Sources & references

Content responsibility: FrameTinker editorial desk. Source authors and software maintainers are credited separately below; this is not a claim of hands-on testing.

Published .

RetroArch: theodore — official gaming software documentation https://raw.githubusercontent.com/libretro/docs/master/docs/library/theodore.mdRetrieved Oct 14, 2026

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