jpolo1224
caaf80749e
Two follow-ups from testing the long-press menu. ★ SaveSlotLookup only searched ONE root. A device with a configured system directory has two — assetCopyRoot resolves to that one (typically the SD card, where ROMs and most saves live) while others stay under getExternalFilesDir. On the test device 13 states sat in one and 5 in the other, so either root alone under-reports, and the failure is silent: it reads as 'this game has no save states' rather than as a bug. This is the same two-root trap that once made a patches investigation report a false 'clean'. Both are searched now, and when a slot exists in both the newer file wins. Swipe-to-dismiss is back for bottom-aligned modals. PadModal replaced ModalBottomSheet because that is its own focused Android window and every row inside it was unreachable by pad; the swipe was the one thing given up in the trade. But a panel that rises from the bottom edge with a rounded top and a drag handle is PROMISING a swipe, so its absence reads as broken rather than as a deliberate omission. The panel now follows the finger and dismisses past a threshold, without giving up focus ownership. Downward only, and only for BottomCenter: dragging a bottom sheet up should not lift it off the edge it is anchored to, and on centred or anchored menus a vertical drag means nothing and would fight scrolling inside them. Worth recording that the originally reported symptom was NOT a bug: God of War II has no save states on the test device, so an absent row was correct. The root bug was real but found by inspection while checking that.
ARMSX2 — Native ARM64 JIT Fork of PCSX2
ARMSX2 is a free and open-source PlayStation 2 (PS2) emulator based on PCSX2. Its purpose is to emulate the PS2's hardware, using a combination of MIPS CPU Interpreters, Recompilers and a Virtual Machine which manages hardware states and PS2 system memory. This allows you to play PS2 games on your phone, PC, or gaming handheld, with many additional features and benefits.
Thank You
The ARMSX2 team is eternally indebted to the PCSX2 project it is based on. We are so fortunate to build on their 20 years of hardcore development.
About This Fork
The upstream PCSX2 project ships an ARM64 interpreter build for ARM, but its high-performance JIT recompilers (EE, IOP, VU0, VU1, and vtlb fast memory) are x86-64 only.
This fork exists to close that gap. The goal is to preserve the correctness features of 20 years of PCSX2 development, while generating the fastest native ARM performance possible.
Current status:
- ✅ EE (Emotion Engine) recompiler — integer, float, MMI, COP0/COP1/COP2, branches, load/store
- ✅ IOP (I/O Processor / R3000A) recompiler — full integer, load/store, branches, coprocessors
- ✅ VU (Vector Unit) recompiler — microVU skeleton + Upper FMAC vector ISA complete; Lower ISA and runtime complete
- ✅ vtlb fast memory
- ✅ Native ARM64 binary builds and boots the PS2 BIOS
- ✅ 2D games are already playable
- ✅ 3D games run
Why LLMs / AI Were Used
A word on methodology:
The x86-64 JIT code in upstream ARMSX2 is already proven correct — it has run thousands of PS2 titles for years. The challenge in this port is not emulator design or JIT theory; it is mechanical translation of a large, well-understood x86-64 assembly codebase into equivalent ARM64 assembly (via VIXL) while preserving the exact same register-allocation contracts, block lifecycle, and recompiler semantics.
Large language models (LLMs) were used as an accelerant for this translation work — pattern-matching x86 JIT boilerplate to ARM64 equivalents, scaffolding emit routines, and keeping the porting velocity high. The JIT logic (block compiler, dispatcher, analysis passes, flag pipelines, clamping rules, Tri-Ace hacks, etc.) is taken directly from the upstream x86 implementation and validated against it. Nothing was hallucinated from scratch.
In other words: the hard engineering was done by the PCSX2 team over two decades. The hard typing — translating ~50k lines of x86 emitter code into ARM64 — is what AI helped compress.
System Requirements
ARMSX2 targets ARM64 across desktop (macOS, Windows, Linux) and mobile (Android, iOS/iPadOS), all from the single shared core. Our setup documentation page contains additional details on software and hardware requirements.
Please note that a BIOS dump from a legitimately-owned PS2 console is required to use the emulator. For more information, visit this page.
Building
Check out our github actions for the latest build recipe