it for data (or sent it commands). They also added the PROCEED and INTERRUPT pins which could be used by the devices to set bits in control registers in the host, but these were not used in the deployed system. Likewise, the timing signals generated by the POKEY were sent on the CLOCKOUT and CLOCKIN pins, although the asynchronous protocol did not use these.

Legacy

SIO was not patented by Atari. Decuir said that when a patent troll sued the USB Implementers Forum,

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