Skip to main content

You are not logged in. Your edit will be placed in a queue until it is peer reviewed.

We welcome edits that make the post easier to understand and more valuable for readers. Because community members review edits, please try to make the post substantially better than how you found it, for example, by fixing grammar or adding additional resources and hyperlinks.

2
  • 3
    Excellent answer, just to expand and say that modern processors are starting to drop hacks like A20 line masking, so support for older edge-cases is dying.
    – Basic
    Commented Oct 20, 2015 at 19:10
  • 3
    To the last paragraph: BIOS can't use the stack "freely": it can't write to the ROM (to which 0xFFFFFFEC would be mapped). This means not only no push but for example no call either. These must wait until RAM is ready.
    – The Vee
    Commented Nov 12, 2018 at 9:22