Execute SWI 0x01 through original ARM code. Clear selected work RAM, palette RAM, VRAM, and OAM; force blank; reset supported display, DMA, timer, and interrupt registers through normal bus writes. Preserve caller state and excluded BIOS work RAM apart from the common SWI frame.
Reject serial/sound reset flags before display or reset writes. Document the supported subset, timer counter behavior, DMA ordering, and RAM caller hazards. Add fifteen tests covering memory flags and boundaries, I/O defaults, rendering, register preservation, hidden device latches, diagnostics, and device progress.
Validated on Darwin arm64: 720 default and 709 core-only tests in debug and release; formatting, Clippy, rustdoc, ten native window smoke tests, and CPU/timer demos pass.
