[finger563]

What

MGS can now change to disc 2. Copy disc 2's extracted files into mgs/DISC2/ on the SD card (next to disc 1's STAGE.DIR). When the game shows its "insert disc 2" screen, press START. The port swaps the files it reads in place of opening the console's lid, then the game runs its own disc check.

How (mgs_reversing esp32p4)

• The four screens that check discs (change, abst's load, open/title, demosel) wait for the lid to open and close. On the port, MGS_TRAY_STEP puts the wanted disc in at that step and skips the spin-up steps. The sector-16 read is faked, and FS_CdMakePositionTable reports which disc is in.
• virtual_cd.c: Mgs_CdInsertDisc pauses the read-ahead task, reopens the files from the other disc's folder and clears the sectors it had already read from the old disc. If DISC2 is missing, it logs that and the game reports the wrong disc and asks again.
• A save state taken on disc 2 puts disc 2 back in when it's loaded.
• MGS_DiskName now includes disc 2's executable name, SLUS_007.76.

Testing

• Tested on the Tab5 with a build that boots straight into the change stage.
• The log showed [vcd] disc 1 out, disc 2 in, then the game's THIS IS DISC 2!! / OK! OK!, then load s13a.
• In s13a you can move around and the radar shows the enemies. The door can't be opened because that test skipped disc 1, so Snake has no items or keycards.
• After the test, the boot was set back to the title screen and rebuilt.

🤖 Generated with Claude Code

https://claude.ai/code/session_01SFCMzomCZ5wRHJN4sxwkvY

[Copilot]

🔵 Needs a closer look

The unpopulated mgs_reversing submodule prevents verification of the missing-disc fallback, return to disc 1, and disc-2 save-state restoration.

No open issues 🎉

What changed in this PR

Updates the MGS port’s README to document second-disc setup and disc-switching behavior.

Changes:

• Explains where to place disc 2’s extracted files and how to switch discs using START.
• Describes missing-disc behavior and restoration of disc 2 when loading a save state.

File	Description
components/​mgs/​README.md	Documents disc 2 installation, switching, and save-state support.

_{Review effort: Balanced}

[github-actions]

ESP-IDF Size Report for 'Tab5 Emu'

Metric	Base	PR	Delta
FLASH	0 bytes (0.00%)	0 bytes (0.00%)	0 bytes (0.00%)
DRAM	267,410 bytes (60.60%)	267,410 bytes (60.60%)	0 bytes (0.00%)
IRAM	0 bytes	0 bytes	0 bytes
RAM (DRAM+IRAM)	267,410 bytes	267,410 bytes	0 bytes (0.00%)

_{FLASH uses app .bin size or json2 flash sum. RAM sums DRAM+IRAM via idf_size. Percentages shown when totals are available.
DRAM/IRAM usage does not include memory used by the heap allocator at runtime.
This report was generated by esp-idf-size-delta.}