RickGalasio/zuz80 ? reverse-engineered prompt

Build me a small toolkit for old ZX Spectrum emulator snapshot files, the kind with .sna files.

I want one place where I can inspect a snapshot, disassemble the Z80 code inside it, compare two or three snapshots, and generate a simple patch or batch file to apply changes between them. It should also let me change a single byte in a snapshot file and save the result safely. If it helps, keep the whole thing very simple and old school, since this is for very old tools and file formats.

Please make it practical for someone working with ZX Spectrum snapshots, with clear command line usage and readable output. If you need to check anything about the file format or Z80 details, look up current docs online.