> Yes, it's Centipede. And that is the correct address. So, the question becomes do you > really need to mirror the rom? Or, can you just start the execution from the > beginning since the first instruction appears as JSR 0x3b04 anyway?
You need to mirror the ROM at least enough so that the 6502 vectors appear at 0xfffx. I would suggest fully mirroring it from square 1 though - it's not hard to do, and it immediately eliminates one source of potentially hard to trace problems.
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