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The Ricoh 2A03 or RP2A03 (NTSC version) / Ricoh 2A07 or RP2A07 (PAL version) is an 8-bit microprocessor manufactured by Ricoh for the Nintendo Entertainment System video game console. It was also used as a sound chip and secondary CPU by Nintendo's arcade games Punch-Out!! and Donkey Kong 3.
Ricoh manufactured several electronic components for video game consoles - the Ricoh 2A03 8-bit CPU with built-in PSG sound as well as the Ricoh 2C02 used in the Nintendo Entertainment System (2A07 CPU in the PAL NES and the 6538 PPU in PAL famiclones), and the Ricoh 5A22 16-bit CPU and the Ricoh 5C77 and Ricoh 5C78 PPUs used in the Super ...
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Aug 31, 2020 · Ricoh 2A03 - Synth DIY Wiki. The RP2A07 PAL version. The Ricoh 2A03, RP2A03 (NTSC), Ricoh 2A07, RP2A07 (PAL) or 2A03 is the 8-bit microprocessor in the Nintendo Entertainment System (NES), (also known as the Famicom). Technical details. Manufactured by Ricoh and based on the MOS Technology 6502.
Jul 1, 2022 · The noise channel in the Nintendo is not noise in the usual sense, where amplitude or frequency would be modulated randomly. Instead, the NES sends a random sequence of bits directly to audio out. This is analagous to a square wave with a continuously-varying random pulse width. The NES produces noise in repeating sequences of 32767 or 93 bits.
理光2A03（Ricoh 2A03、RP2A03，NTSC版）和理光2A07（Ricoh 2A07、RP2A07，PAL版）是理光生产的8位元微处理器，用于任天堂电子游戏机红白机。 其为MOS Technology 6502核心的，除去了6502的二-十进制编码模式，但加入22个存储器映射输入输出暂存器，控制、初级DMA ...
CPU. The NES CPU core is based on the 6502 processor and runs at approximately 1.79 MHz (1.66 MHz in a PAL NES). It is made by Ricoh and lacks the MOS6502's decimal mode. In the NTSC NES, the RP2A03 chip contains the CPU and APU; in the PAL NES, the CPU and APU are contained within the RP2A07 chip.
Jan 8, 2023 · CPU - Ricoh 2A03 CPU which is a MOS 6502 without a decimal mode. Clocked 1.789773Mhz for NTSC (System 21.47727Mhz / 12) and 1.773447Mhz for PAL (System 26.601171Mhz / 15) Memory - 2 KB. Video. Ricoh 2C02 PPU (Picture Processing Unit) Resolution - 256 x 240 pixels (Only 256 x 224 pixels are visible on NTSC) Colors - Fixed 52 (44 colors, 5 grays ...
