What is the relationship between the Ricoh 2A03 and the MOS …
2019年2月9日 · The Ricoh 2A03 (NTSC) and 2A07 (PAL) are best thought of as ASIC devices. They include a 6502-compatible CPU core, but these chips also include the NES's 5-voice …
Why did so many early microcomputers use the MOS 6502 and …
2017年5月14日 · First in Atari consoles and then in the original NES, which used an ASIC version of the 6502 in the form of the Ricoh 2A03. Fifth, the 6502 had robust industry support that …
How do NES/famicon games produce additional sound channels?
The NES/famicon has always used the Ricoh 2A03, a modified MOS 6502 processor to generate the memorable music and sound effects of classic Nintendo games and continues to define …
nes - Large number of Famiclones - Retrocomputing Stack Exchange
2020年9月14日 · At some point, the Taiwanese semiconductor fab UMC made clone chips of the Nintendo/Ricoh 2A03 CPU and 2C02 PPU. They were called the UA6527 and UA6528, …
Did Nintendo pay WDC for their use of the 65816 core?
When Nintendo used the 6502 core in the NES (as part of the Ricoh 2A03/2A07 microprocessor and sound generator), they circumvented the 6502's patent protection by disabling the BCD …
nintendo - Does the NES handle unlisted processor instructions ...
2018年11月1日 · To my knowledge, the NES and the Famicom had the exact same CPU (a Ricoh 2A03). So, it's unlikely there were any differences in behavior between the two with regards to …
sound - How did the NES's RP2A03 noise generator produce 32k …
2024年7月23日 · Now, the wiki states that the PRNG sequence of the 2A03's noise channel is 32k bits wide. 32k is 2^15, implying that the NES 2A03 chip somehow manages to get the …
Does the 6502's TXS and TSX affect flags or not?
2020年7月22日 · Rather than relying on secondary sources, wouldn't the easiest thing to do be to check the 6502 manual? Wouldn't answer your questions about the Ricoh 2A03 (which does't …
How similar were the MC6800 and MOS 6502?
2024年9月25日 · @RussellMcMahon: IMHO, the 6502 could have been made much more suitable for many I/O tasks if it had been designed so that all opcodes where the bottom two …
What happened to the 65832? - Retrocomputing Stack Exchange
2020年5月22日 · As I understand it, the 5-10 billion number claimed by WDC includes all vaguely 65xx-based chips, including the original 6502, patent-skirting implementations like the …