D815 - PlayGo starts for a title that treats it as optional

Status: decided Date: 2026-10-12

scePlayGoInitialize(param) answers 0 for a parameter block, writing nothing, and scePlayGoTerminate() answers 0 once after it. A null block, and a terminate with nothing initialised, answer the placeholder. Nothing else in libScePlayGo is implemented, so scePlayGoOpen answers the placeholder.

Guest-observed (known_by = guest-observed). The library binds in no probe leg, by link or by name, on a non-retail eboot (REQ-pg01), so its answers cannot be measured. PPSA21564 initialises it once at start-up with a 0x200000-byte work block, asserts the answer is 0 (PlayGo.cpp line 111) and traps with int 0x41 when it is not. The retail title runs on the console (D709), so the console answers 0 there.

What follows needs nothing invented. When scePlayGoOpen fails, the title sets its PlayGo state to 3 and goes on, the same state it reaches when scePlayGoGetChunkId lists one chunk: the content is taken as installed. Every file of the title is present to orbistoun, so that is what it is. On that path it terminates PlayGo and asserts that answer is 0 too (line 127).

Why: the placeholder is not 0, so PPSA21564 stopped at its own assertion at start-up.

Rejected:

• Answering scePlayGoOpen, scePlayGoGetChunkId and scePlayGoGetToDoList: the handle, the chunk list and the to-do list are the library's from the package's chunk table, and the title already goes on without them.