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OSSC classic modding and firmware experiments

September 22, 20253 threads~2 min read

Modded my classic OSSC to accept newer firmware, and experimented with a PC Engine-specific build that tries to emulate the composite colour palette on RGB.

hitmanmcc
hitmanmcc

September 22, 2025· Thread 1· 2 tweets

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1/2 I've been delaying this for long enough. Today was the day. I decided to pick up my OSSC classic and mod it so I can use the latest firmware. It's hard to argue with the OSSC in terms of bang for the buck. Amazing what such an old device can do. Check below #OSSC #RetroGaming

2 / 2

2/2 Here are some pictures of me testing it in 1440p. Third picture has HDR, VRR and PVM scanline post-processing. The fourth one is without any of that. #MegaDrive #Earthion

hitmanmcc
hitmanmcc

February 11, 2026· Thread 2· 2 tweets

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Testing a new interesting firmware for the OSSC that will do something cool for all the PC Engine fans out there. I'm trying to help out the developer of the firmware. #RETROGAMING #pcengine

2 / 2

this link will take you to the thread where he reaches out for help testing.

hitmanmcc
hitmanmcc

February 11, 2026· Thread 3· 2 tweets

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Interesting result, obviously it's very early stage and WIP. I for one hope he pursues this. It would be cool to get something resembling the composite palette in RGB. The fact that this firmware can just be sideloaded onto the OSSC with the latest firmware makes this even better

2 / 2

This is just me playing around with settings.