#Start with the execution contract

When building emulator infrastructure, the ISA is not just a document. It becomes the contract that defines what state exists and how it may change.

#Core moving parts

• register state
• instruction decoding
• memory access semantics
• branch and trap behavior

#Why this framing helps

This perspective makes the eventual web-facing emulator more coherent, because the UI can map directly onto the same execution stages used internally.