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- A20_line abstract "The A20 or addressing line 20 is one of the plethora of 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 wikiPageRevisionID "604715406".
- 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 comment "The A20 or addressing line 20 is one of the plethora of 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 (informatica)".
- A20_line label "A20 line".
- A20_line label "A20-Gate".
- A20_line label "A20总线".
- A20_line label "Linea A20".
- 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 Q1417058.
- A20_line wasDerivedFrom A20_line?oldid=604715406.
- A20_line depiction IBM_PC_Memory_areas.svg.
- A20_line isPrimaryTopicOf A20_line.