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The original IBM PC and AT designs allocated 10 bits for I/O addressing, and only decoded address lines A0-A9 for on-board I/O devices. However there was no physical limitation to 10 bits, so a card could use A10-A19 so long as it didn't clash with the aliases of 10 bits cards or motherboard devices. So yes, the game-port card has aliases at 601h etc., ...

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