tevlon

fixed!

fixed. But, now you have to upload your own ROM. (Afraid of getting DMCAed by Konami)

fixed. But, now you have to upload your own ROM. (Afraid of getting DMCAed by Konami)

I added audio support, but now you need to upload your own ROM. I didn't expect this to get so much attention. Since Konami is company behind Contra and they are known for DMCAing, i want to be better safe than sorry.

i had no idea. TIL

Bear in mind: the dissambly was done pre-LLMs. The early commits are from 2023. Although, ChatGPT 4 existed then, it was not capable of doing these things.

Impressive work, indeed. vermiceli the GOAT.

whoa, that's cool. I didn't know about this. Thanks for sharing!

For the Multiplayer part: It's deterministic lockstep. Both browsers run the same C core (compiled to WebAssembly), and the only thing sent over the network is each player's button bitmask per frame. Local input is delayed by 4 frames (~67 ms), which hides normal internet latency; if the other player's input for a frame hasn't arrived yet, the game waits for it. Every 2 seconds both sides compare a hash of the game RAM to catch desyncs. Transport is a WebRTC data channel via PeerJS (its free cloud server handles matchmaking with a room code), with Google's STUN server for NAT traversal and Metered's free-tier TURN relay as a fallback when a direct connection isn't possible.

For AI usage: It was all done by Claude/Codex, but it wasn't that straight forward. First: i started in April and the models weren't good enough and would make errors. You could see those immediately in glitches. Then, i spent some time in building a harness and collect telemetry data in Mesen. Once, i had that: i just played the game in the emulator and asked Claude Opus 5.5 to use this as verification. The rest was smooth.

i only testing in chrome. Will look into it!

Thank you for your kind words. Yes, i hate subscriptions. But, also. Renovating is a one-off thing and i can't justify charging a monthly fee for a service that is only needed once.

This is one of the reasons people love using xona: no subscriptions :)