Megadev saves

Choose what the user's game needs to persist. Keep checkpoints, options and temporary scene state distinct; the Lab's three fields are only examples.

• Read Backup RAM and devices before choosing a BIOS interface or making claims about the optional cartridge.
• Read Records and recovery for byte layouts, migration, redundant records, readback and failure policy.
• Read Validation for compiled BIOS-ABI tests, emulator persistence checks and the remaining physical-hardware evidence.

Essential contracts: