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Master the fundamental concepts of emulation through this focused micro-challenge.
Passing opcode tests is how emulator authors prove correctness. Community ROMs exercise every instruction and expose COSMAC VIP quirks modern interpreters handle differently.
Popular ROMs:
Known divergences:
For example, a failing shift test often means your \`8XY6\` updates the wrong register.
Validation workflow:
When a ROM fails, isolate one opcode family at a time using Timendus subtests. Fixing shift behavior before jump behavior avoids chasing multiple bugs from one failing display pattern.
This exercise asks you to document test ROM usage and quirk tables. You will explain how to validate your emulator against community suites and reconcile VIP versus modern behavior.
You will use the same mental model here when reading production interpreter source later in the track. Sketch one concrete input on paper, predict the outcome, then confirm with code. That discipline catches logic errors early and makes debugging far faster when you extend the implementation in follow-on tasks.
Document CHIP-8 test ROM validation in C.
Requirements:
Three hints are available for this task, revealed one at a time inside the code workspace so you can struggle productively before seeing them.
All starter code and reference implementations are available for your local setup.
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