In spite of these limitations, in less than a year, the Sound Blaster became the top-selling expansion card for the PC. It achieved this by providing a fully AdLib-compatible product, with additional features, for the same, and often a lower price. The inclusion of the game port, and its importance to its early success, is often forgotten or overlooked. PCs of this era did not include a game port. Game port cards were costly (around $50) and used one of the few expansion slots PCs had at the time. Given the choice between an AdLib card or a fully compatible Sound Blaster card that came with a game port, saved a slot, and included the "DSP" for not much more in price, many consumers opted for the Sound Blaster. In-game support for the digital portion of the card did not happen until after the Sound Blaster had gained dominance.