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Does it work if your JMP jumps to RAM that does not disappear? (=confirms that CPU does not immediately jump somewhere unknown, at least immediately)
Do you see color bars if you do something like loop: move.w (a0),(a1); bra.s loop) after the reset-instruction, A0=dff006 and A1=dff180?
Make sure CPU instruction cache is enabled.
It also could be some accelerator board side-effect, for example if board has maprom support, it requires some logic to handle also overlay. Perhaps it is only reset when board detects hardware reset.
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