The 16-Bit Decision That Became a 64-Bit Problem

Comments · 19

• MA

  @mandolinic · 10 days ago

  What we need now is an AI20 gate that stops AI slop.

  3

• RO

  @robbietorkelsonn8509 · 1 day ago

  all software in the MSDOS era was close to the metal

• BB

  @bbbl67 · 10 days ago

  <a href="https://www.youtube.com/watch?v=l4833RocecM&amp;t=2655">44:15</a> Intel quietly let go of the X86S mode proposal two years later, as it would break too much compatibility which would need to be built back up through software emulation. Better to just keep the existing behaviour continue.

• PR

  @profvonshredder2563 · 11 days ago

  this was IBM’s “you’re holding it wrong” moment…nothing wrong with the AT pc

• BB

  @bbbl67 · 10 days ago

  I remember the &quot;Big Real mode&quot; or &quot;UnReal mode&quot; feature being mentioned in passing before. I remember thinking, that it could be used as a faster way of addressing large amounts of memory than the Protected Mode, because it wouldn&apos;t have to do the Protected Mode memory protection checks. But nothing came of it in the end.

• SE

  @semicuriosity257 · 11 days ago

  Intel no longer supports the A20 gate, starting with Haswell. Page 271 of the Intel System Programmers Manual Vol. 3A from June 2013 states: &quot;The functionality of A20M# is used primarily by older operating systems and not used by modern operating systems. On newer Intel 64 processors, A20M# may be absent.&quot;

  1

• BR

  @bradmartisius2625 · 11 days ago

  As AI slop goes, the info is really good. &nbsp;The voice of the narration is insufferable.

  3

• NI

  @nIghtorius · 11 days ago

  ffs, ppl seems to have discovered the a20 gate on the keyboard controller in order to make a wraparound on address above 1megabyte. Now we need to have like 5000 generic ai blabbering videos about it. And blowing it in a way worse situation that this actually is. Good for you you discovered this. Modern systems running uefi are booting already in a 64-bit state with the a20 gate disabled. If you published this video around the first x86-64. then this MIGHT be something.

  3

• BE

  @benotsilent6703 · 10 days ago

  AI slop. Takes an hour to say what really only needs 20 minutes.

• AN

  @Andy-Christian · 6 days ago

  Please stop producing this crap.

• DS

  @dsigetich · 11 days ago

  Can’t stand the false drama of the voice. Had to shut the video down.

  2

• NE

  @neomatrix4412 · 10 days ago

  x86s please