Editing Memory management controller (Nintendo) (section)

===VRC6===
[[File:vrc6.jpg|thumb|right|The VRC6]]
* Manufacturer: [[Konami]]
* Games: ''[[Castlevania III: Dracula's Curse|Akumajō Densetsu]]'', ''Mōryō Senki MADARA'', ''[[Esper Dream|Esper Dream II]]''
The VRC6 (Virtual Rom Controller) is an advanced MMC chip from Konami, supporting bank switching for both program code and graphics as well as a CPU cycle–based [[Interrupt request|IRQ]] counter, which can also act as a scanline counter. The chip also contains support for three extra sound channels (two [[Square wave (waveform)|square wave]]s of eight [[duty cycle]]s each, which can be configured to play PCM samples using 100% duty cycle, and one [[sawtooth wave]]). It is used in ''Akumajō Densetsu'', the Japanese version of ''[[Castlevania III: Dracula's Curse]]'', while the Western version uses the MMC5 from Nintendo. Since the [[Nintendo Entertainment System]] by design does not allow cartridges to add additional sound channels, the Famicom version's soundtrack was reworked to follow those specifications; the soundtrack for the Western version utilizes the five stock sound channels built into the NES.<ref name="Gamasutra">{{cite web|title=Breaking the NES for Shovel Knight|url=https://www.gamedeveloper.com/design/breaking-the-nes-for-shovel-knight|website=[[Gamasutra]]|last=D'Angelo|first=David|date=June 25, 2014}}</ref>