315-5309
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Revision as of 19:38, 9 August 2012 by Tristanseifert (talk | contribs)
The 315-5309 is one of the two IO chips that can be found on early (usually pre-TMSS) Mega Drive models. It handles the version register, regions (part of the version register) as well as the three IO ports present on the Mega Drive.