Real mode, also called real address mode, is an operating mode of all x86-compatible CPUs Real mode is characterized by a 20 bit segmented memory address space (giving exactly 1 MiB of addressable memory) and unlimited direct software access to all memory, I/O addresses and peripheral hardware. Real mode provides no support for memory protection, multitasking, or code privilege levels. Before the release of the 80286, which introduced Protected mode, real mode was the only available mode for x86 CPUs. In the interests of backwards compatibility, all x86 CPUs start in real mode when reset.
Read more about Real Mode: History, Addressing Capacity, A20 Line, Switching To Real Mode
Famous quotes containing the words real mode, real and/or mode:
“Celebrity-worship and hero-worship should not be confused. Yet we confuse them every day, and by doing so we come dangerously close to depriving ourselves of all real models. We lose sight of the men and women who do not simply seem great because they are famous but are famous because they are great. We come closer and closer to degrading all fame into notoriety.”
—Daniel J. Boorstin (b. 1914)
“The Troubles are a pigmentation in our lives here, a constant irritation that detracts from real life. But life has to do with something else as well, and it’s the other things which are the more permanent and real.”
—Brian Friel (b. 1929)
“The mode of clearing and planting is to fell the trees, and burn once what will burn, then cut them up into suitable lengths, roll into heaps, and burn again; then, with a hoe, plant potatoes where you can come at the ground between the stumps and charred logs; for a first crop the ashes suffice for manure, and no hoeing being necessary the first year. In the fall, cut, roll, and burn again, and so on, till the land is cleared; and soon it is ready for grain, and to be laid down.”
—Henry David Thoreau (1817–1862)