The mode in which all x86 processors start up in. Essentially emulates a fast 8086 chip. The only use for it in modern computers is to load the operating system kernel, which then enters protected mode. Programming in real mode is like trying to keep bugs out of all the houses on your block, as opposed to just yours.

The way which x86 registers gets the address:

Logical Address -> Linear Address -> Physical Address

If we follow the arrows from left to right we get Real mode.

If we follow the arrows from right to left we get Protected mode.

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