Your ROM appears to have a header, so either remove it via an option in the hex editor, or add +200 to the address to get there (C2/19E5). Alternatively you could do a hex search for the bytes (BB 20 C1 19 etc.) to find it.
You can tell if your ROM is headered if there are 200 $00's at C0/0000 - C0/00200
You can tell if your ROM is headered if there are 200 $00's at C0/0000 - C0/00200
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