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Furthermore, unless you already have banking implemented, here MBC1 in particular, you won't be able to run cpu_instrs.gb since it does require that mapper. Fortunately, the individual tests do not require a mapper and are in the same repository so use those as they also give more detailed error messages.
The Pandocs are easy to read and contain pretty much everything you need to know to get a basic GB emulator up-and-running. The section on the Power-Up Sequence would answer this question for you and then some. You would've gotten the answer to your question yesterday if you looked at the Memory Map section, which tells you where ROM is mapped, and then some.
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