Neo Geo CD
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The Neo Geo CDZ's startup logo is different than the standard CD version.
Contributed by ProtoSnake
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Pressing Up, Up, Down, Down, Left, Right, Left, Right, Down, Left, Up, Right, Down, Up, Down, C during the startup animation brings up a blocky "SNK NEO GEO" text display. No other function seems to be triggered with this sequence. This is not present on the Neo Geo CDZ.
Contributed by ProtoSnake