Since its original release on PC in 1993, id Software's DOOM has become a canonical target for homebrew ports and technical showpieces.
The latest notable effort brings the game to an unlikely platform: the Casio Loopy, a niche 1995 console marketed in Japan toward young girls that shipped with a Hitachi SH-1 CPU and a built-in thermal sticker printer.
Developer Throaty Mumbo has published a documented tech demo that runs DOOM on original Loopy hardware and on emulators.
The project is presented in a YouTube video that walks through the porting process and links to a public GitHub repository with source and build artifacts.
The Loopy itself was a Japan-only system that received just 11 official games, making it an uncommon target for conversion work and a favorite for retro-focused hobbyists.
Throaty Mumbo describes the build as a DOOM variant assembled through modern source ports: the codebase leverages work from PrBoom and GBADoom while adding a new hardware backend tailored to the Loopy's video display processor, timers, controller interface, and sound chip.
The port includes the first six episode maps (E1M1–E1M6), which the developer says represent roughly the amount of content that would fit into the 4MB ROM used for the project.
Getting the game running on real Loopy hardware presented specific challenges.
The developer documented efforts to enable PCM audio output using a Floopy Drive flash cart and to reconcile timing and rendering differences between emulator and physical hardware.
On actual Loopy units, the build runs at an unoptimised frame rate of approximately 8–15 fps, and Throaty Mumbo characterizes the release as a technology demonstration rather than a finished, polished port.
One of the Loopy's unique features makes an appearance: the port supports the console's sticker printer and can print screenshots from the in-game options menu.
The GitHub repository contains source code, build notes, and usage instructions for those who want to explore or reproduce the experiment, and the YouTube video provides a step-by-step look at the engineering and testing process.
This release continues a long tradition in the homebrew scene of adapting classic titles to unconventional hardware.
For developers and retro enthusiasts interested in platform history or the technical constraints of the Hitachi SH-1–based Loopy, the project is a concise case study in porting, optimisation trade-offs, and creative use of limited system resources.
The latest notable effort brings the game to an unlikely platform: the Casio Loopy, a niche 1995 console marketed in Japan toward young girls that shipped with a Hitachi SH-1 CPU and a built-in thermal sticker printer.
Developer Throaty Mumbo has published a documented tech demo that runs DOOM on original Loopy hardware and on emulators.
The project is presented in a YouTube video that walks through the porting process and links to a public GitHub repository with source and build artifacts.
The Loopy itself was a Japan-only system that received just 11 official games, making it an uncommon target for conversion work and a favorite for retro-focused hobbyists.
Throaty Mumbo describes the build as a DOOM variant assembled through modern source ports: the codebase leverages work from PrBoom and GBADoom while adding a new hardware backend tailored to the Loopy's video display processor, timers, controller interface, and sound chip.
The port includes the first six episode maps (E1M1–E1M6), which the developer says represent roughly the amount of content that would fit into the 4MB ROM used for the project.
Getting the game running on real Loopy hardware presented specific challenges.
The developer documented efforts to enable PCM audio output using a Floopy Drive flash cart and to reconcile timing and rendering differences between emulator and physical hardware.
On actual Loopy units, the build runs at an unoptimised frame rate of approximately 8–15 fps, and Throaty Mumbo characterizes the release as a technology demonstration rather than a finished, polished port.
One of the Loopy's unique features makes an appearance: the port supports the console's sticker printer and can print screenshots from the in-game options menu.
The GitHub repository contains source code, build notes, and usage instructions for those who want to explore or reproduce the experiment, and the YouTube video provides a step-by-step look at the engineering and testing process.
This release continues a long tradition in the homebrew scene of adapting classic titles to unconventional hardware.
For developers and retro enthusiasts interested in platform history or the technical constraints of the Hitachi SH-1–based Loopy, the project is a concise case study in porting, optimisation trade-offs, and creative use of limited system resources.
