2a07 – Set Side B https://setsideb.com The Flipside of Gaming Sat, 25 May 2024 23:09:39 +0000 en-US hourly 1 https://wordpress.org/?v=6.9 https://setsideb.com/wp-content/uploads/2022/04/cropped-mascot512-32x32.png 2a07 – Set Side B https://setsideb.com 32 32 Youtube Series: Inside the Famicom https://setsideb.com/youtube-series-inside-the-famicom/ Mon, 27 May 2024 14:00:00 +0000 https://setsideb.com/?p=7524 Continue reading "Youtube Series: Inside the Famicom"]]> It’s only two episodes in, but this series from the Youtube channel What’s Ken Making is already really interesting, with episodes averaging at around 16 minutes each. The first part is titled “The Design of a Legend,” which doesn’t really grab me much, but the second is about the main processor, “The 6502 CPU,” which Ken admits near the start isn’t exactly accurate. The Famicom/NES’s processor isn’t precisely a MOS 6502; it’s a Ricoh 2A03 in NTSC territories, and a 2A07 in others. The 2A03 is licensed from MOS, but lacks the original’s Binary-Coded Decimal mode, and includes the Famicom/NES’s sound hardware on-die.

Episode 1 (15 minutes):

Episode 2 (17 minutes):

That removed BCD feature. Why? The video notes that the circuits are right there within the chip, but have been disabled by having five necessary traces severed. The video notes that the 6502’s BCD functionality was actually patented by MOS, and asks, was the feature disabled because of patent issues? Was Ricoh trying to avoid paying royalties?

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