315-5309
From MegaDrive Wiki
Revision as of 15:38, 8 August 2012 by Tristanseifert (talk | contribs) (Added physical picture of the chip.)
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.
