VisualPinball.Engine is a comprehensive pinball simulation engine and Unity package for authoring and playing virtual pinball tables. It provides a complete pipeline for importing Visual Pinball (.vpx) files, generating 3D meshes and physics colliders for every playfield element (bumpers, flippers, ramps, rubbers, targets, etc.), and running a Burst-compiled physics simulation with collision detection, flipper mechanics, nudge, and game logic wiring (switches, coils, lamps). The codebase is structured as a Unity package with extensive editor tooling (inspectors, manager windows, asset browser, packaging system) and a runtime player. It is not a standalone application but a library/framework that integrates deeply with Unity's editor and runtime. The architecture is modular, with clear separation of concerns: data classes with BiffAttribute-based binary serialization, mesh generators, collider generators, API interfaces for game logic, and a packaging system for distributing tables as .vpe files. The code demonstrates high craftsmanship in physics simulation, mesh tessellation, and binary format handling, though some legacy components and editor coupling exist.
PinMAME is a specialized fork of MAME 0.76 that emulates the hardware found in solid-state pinball machines. It supports over 2700 ROM sets from Williams, Bally, Stern, Gottlieb, Data East, and other manufacturers. The emulator is delivered in multiple forms: a standalone command-line executable (Unix/Windows), a Windows GUI (PinMAME32), a COM DLL (VPinMAME) for integration with Visual Pinball and other simulators, a lightweight library (libpinmame) for embedding in other applications, and hardware control interfaces (LISY, P-ROC) for driving real pinball machines. The codebase includes CPU emulators (Z80, 6809, 6502, i86, TMS9900, ARM7, etc.), sound chip emulators (YM2151, YM3812, SAA1099, TMS5220, etc.), and pinball-specific subsystems (WPC, System 11, Pinball 2000). It also features a remote debugger with an embedded HTTP server and SSE event streaming, an alternative sound system (altsound) for custom audio, and a cheat engine. The architecture is monolithic with platform-specific frontends, heavily reliant on the MAME core framework. While functional and actively maintained, the codebase shows its age with legacy platform drivers, vendored external libraries, and tight coupling between components.