We got Mechanized Attack USA Ver 1. It uses a different program code and pcb layout from the dumps we have. I'm not 100% sure if it's newer or older than the USA dump in mame. They might have used the Ver 1 stamp to indicate the first time they made an update to a rom but based on the extra daughter boards it looks like an early version made for early sales before the bigger mask roms were ready. But it could also be a late release after they ran out of the bigger roms.
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DU Update: If I was going to describe the attack in one word it would be...mechanized. Yes, the attack was very much mechanized.
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