this post was submitted on 18 Jul 2025
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Videos

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The 6502 Rotate Right Myth | TubeTimeUS (youtube.com)
submitted 8 months ago by scientific_railroads@lemmy.world to c/videos@lemmy.world
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[–] SpaceNoodle@lemmy.world 1 points 8 months ago (1 children)

Wish this were an article

[–] simplejack@lemmy.world 2 points 8 months ago* (last edited 8 months ago) (1 children)

Found an article in the same time it took to write a comment.

https://www.pagetable.com/?p=406#%3A%7E%3Atext=The+MOS+6502+CPU+was%2Cgoing+on+in+these+chips.

The MOS 6502 CPU was introduced in September of 1975, and while the documentation described the three shift/rotate instructions ASL, LSR and ROL, the ROR instruction was missing – the documentation said that ROR would be available in chips starting in June 1976. In fact, the reason for this omission was that the instruction, while being present, didn’t behave correctly. Only few 6502s with the defect are in existence, and nobody seemed to have checked what was actually going on in these chips.

[–] SpaceNoodle@lemmy.world -2 points 8 months ago (1 children)

Nope, writing a short comment is still faster.

[–] JackbyDev@programming.dev 0 points 8 months ago (1 children)

Just be thankful they gave you a link.

[–] SpaceNoodle@lemmy.world -1 points 8 months ago (1 children)

I'm not thankful for the snark.

Anyway, the message I'm trying to convey is that videos like this are useless and shouldn't exist. They should just be articles.

[–] JackbyDev@programming.dev 0 points 8 months ago

Take your frustrations up with the video creator or share articles you find.