Ex-Sega engineer creates ‘super realistic’ CRT monitor emulator — incredible retro offering even includes TV screen tapping to fix picture

Ex-Sega engineer creates 'super realistic' CRT monitor emulator — incredible retro offering even includes TV screen tapping to fix picture

Physically satisfying retro simulation tech is the brainchild of an ex-Sega employee.

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皆様の要望にお応えして、テレビ画面叩きに対応しました! https://t.co/Bg75IsbW28 pic.twitter.com/DJJjhuOC7x July 14, 2026

The developer of this CRT emulator, GOROman, is an ex-Sega and ex-Facebook software engineer. They explain that the famicom-rf-hackrf-decoder software receives VHF RF output (NTSC-J) from their Famicom ( Nintendo NES ) via an open-source SDR (software-defined radio) solution dubbed the HackRF One.

With the software running and the NES plugged into the HackRF One, the console’s RF-modulated video can be displayed on VHF channel 1 or 2. However, here you can see it on a modern LCD, in a window on the desktop. Thus the GOROman project is performing a full NTSC-J color decode in software and displaying the result on the desktop in real time via SDL2.

It is further explained that the Famicom “is not broadcast-compliant (non-interlaced 240p, chroma phase advancing 120° per line, one short line per frame).” Therefore, the decoder has to run several processes in the background to avoid quirks like drifts, wobbles, and color burst instability.

In summary, the Famicom’s RF output isn’t ideal for piping into modern monitors, so the decoder has to effectively simulate an analog TV’s brain, locking in the image stability and color. The initial demo shared by GOROman looked so much like a ‘damaged TV’ because the dev wanted to play around "by shifting the VHF frequency (exaggeratedly)." [machine translation] It was an eye-catching, humorous demo.

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