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- A20_line abstract "The A20 or addressing line 20 is one of the electrical lines that make up the system bus of an x86-based computer system. The A20 line in particular is used to transmit the 21st bit on the address bus.A microprocessor will typically have a number of addressing lines equal to the base-two logarithm of its physical addressing space. For example, a processor with 4 gigabytes of physical addressing space requires 32 lines, which are named A0 through A31. The lines are named after the zero-based number of the bit in the address they are transmitting, where the least significant bit is first, therefore numbered bit 0, and signaled on line A0. A20 transmits bit 20 (the 21st bit) and will become active once addresses reach 1 megabyte or 220.".
- A20_line thumbnail IBM_PC_Memory_areas.svg?width=300.
- A20_line wikiPageExternalLink A20.html.
- A20_line wikiPageID "263659".
- A20_line wikiPageLength "9462".
- A20_line wikiPageOutDegree "49".
- A20_line wikiPageRevisionID "695612454".
- A20_line wikiPageWikiLink Address_bus.
- A20_line wikiPageWikiLink Application_programming_interface.
- A20_line wikiPageWikiLink BIOS.
- A20_line wikiPageWikiLink Booting.
- A20_line wikiPageWikiLink CONFIG.SYS.
- A20_line wikiPageWikiLink Category:IBM_PC_compatibles.
- A20_line wikiPageWikiLink Category:Memory_expansion.
- A20_line wikiPageWikiLink Category:X86_architecture.
- A20_line wikiPageWikiLink Category:X86_memory_management.
- A20_line wikiPageWikiLink Chipset.
- A20_line wikiPageWikiLink Computer_data_storage.
- A20_line wikiPageWikiLink Electricity.
- A20_line wikiPageWikiLink Extended_memory.
- A20_line wikiPageWikiLink HIMEM.SYS.
- A20_line wikiPageWikiLink Haswell_(microarchitecture).
- A20_line wikiPageWikiLink High_memory_area.
- A20_line wikiPageWikiLink IBM.
- A20_line wikiPageWikiLink IBM_Personal_Computer.
- A20_line wikiPageWikiLink AT.
- A20_line wikiPageWikiLink Intel_80186.
- A20_line wikiPageWikiLink Intel_80286.
- A20_line wikiPageWikiLink Intel_80386.
- A20_line wikiPageWikiLink Intel_80486.
- A20_line wikiPageWikiLink Intel_8086.
- A20_line wikiPageWikiLink Intel_8088.
- A20_line wikiPageWikiLink Intel_MCS-48.
- A20_line wikiPageWikiLink Least_significant_bit.
- A20_line wikiPageWikiLink Logarithm.
- A20_line wikiPageWikiLink Logic_gate.
- A20_line wikiPageWikiLink Memory_management.
- A20_line wikiPageWikiLink Motherboard.
- A20_line wikiPageWikiLink Nehalem_(microarchitecture).
- A20_line wikiPageWikiLink Operating_system.
- A20_line wikiPageWikiLink Pentium.
- A20_line wikiPageWikiLink Protected_mode.
- A20_line wikiPageWikiLink Real_mode.
- A20_line wikiPageWikiLink System_bus.
- A20_line wikiPageWikiLink Virtual_8086_mode.
- A20_line wikiPageWikiLink Virtual_memory.
- A20_line wikiPageWikiLink X86.
- A20_line wikiPageWikiLink File:IBM_PC_Memory_areas.svg.
- A20_line wikiPageWikiLinkText "A20 address line".
- A20_line wikiPageWikiLinkText "A20 handler".
- A20_line wikiPageWikiLinkText "A20 line".
- A20_line wikiPageWikiLinkText "A20 line#A20 gate".
- A20_line wikiPageWikiLinkText "A20 line#A20 handler".
- A20_line wikiPageWikiLinkText "A20".
- A20_line wikiPageWikiLinkText "Gate A20".
- A20_line wikiPageWikiLinkText "line A20".
- A20_line wikiPageUsesTemplate Template:Citation_needed.
- A20_line wikiPageUsesTemplate Template:Refimprove.
- A20_line wikiPageUsesTemplate Template:See_also.
- A20_line subject Category:IBM_PC_compatibles.
- A20_line subject Category:Memory_expansion.
- A20_line subject Category:X86_architecture.
- A20_line subject Category:X86_memory_management.
- A20_line hypernym Lines.
- A20_line type RailwayLine.
- A20_line type Redirect.
- A20_line type Thing.
- A20_line comment "The A20 or addressing line 20 is one of the electrical lines that make up the system bus of an x86-based computer system. The A20 line in particular is used to transmit the 21st bit on the address bus.A microprocessor will typically have a number of addressing lines equal to the base-two logarithm of its physical addressing space. For example, a processor with 4 gigabytes of physical addressing space requires 32 lines, which are named A0 through A31.".
- A20_line label "A20 line".
- A20_line seeAlso X86_memory_segmentation.
- A20_line sameAs Q1417058.
- A20_line sameAs A20-Gate.
- A20_line sameAs Linea_A20.
- A20_line sameAs A20_(informatica).
- A20_line sameAs m.01n2xv.
- A20_line sameAs Q1417058.
- A20_line sameAs A20总线.
- A20_line wasDerivedFrom A20_line?oldid=695612454.
- A20_line depiction IBM_PC_Memory_areas.svg.
- A20_line isPrimaryTopicOf A20_line.