The 6502 Rotate Right Myth

Many people think that the first revision of the famous 6502 microprocessor had a bug in its rotate right instruction. But is that really true?

The article about undocumented 6502 instructions:
https://www.masswerk.at/nowgobang/2021/6502-illegal-opcodes

Browse through the Rev A 6502 chip yourself:
https://siliconpr0n.org/map/mos/6502a/mz/

The MOnSter 6502:
https://monster6502.com/

Catch up with me on Mastodon:
https://mastodon.social/@tubetime

Or on Twitter:
https://twitter.com/TubeTimeUS

Chapters:
00:00 The Myth
03:25 Shift vs. Rotate
04:09 Smashing a Rare Chip (and the Myth!)
06:59 Adding ROR
08:50 Conclusion: It's a Missing Feature!

Видео The 6502 Rotate Right Myth канала TubeTimeUS