After a decade of reversing, I got co-op working in DOS Wing Commander

A years-long reverse-engineering effort found where classic Wing Commander keeps player position, camera angle and velocity inside its 640K of DOS memory, then used that to sync a second player's ship over a network as a real wingmate instead of sharing one cockpit. The write-up walks through the actual method: snapshotting memory while stopped versus moving, diffing which bytes changed, then confirming candidates by poking values live with the DOSBox debugger. You can play it directly in the browser or watch a video of it running.