First stab at allowing a playback to be aborted.
It only works if the first keystroke made is holding 2600 to shift to playback mode and then the second being a key to play back a memory. At this point, pressing and holding a key will abort playback after the current one is finished. Subsequence playbacks are not aborted. Nor are playbacks aborted if one of the twelve other keys are pressed before shifting into playback mode.
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