A20 handlers - Definition. Was ist A20 handlers
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Was (wer) ist A20 handlers - definition

SIGNAL IN THE SYSTEM BUS OF AN X86-BASED COMPUTER SYSTEM
A20 handler; A20 Line; A20 Gate; A20 gate; Gate A20; Packed file is corrupt; Packed File Corrupt; Call 5; CALL 5 (DOS); CALL 5 (PSP)
  • The high memory area is only available in real mode on 80286 processors if the A20 gate is enabled.

A20 handler         
<software, storage> IBM PC memory manager software providing HMA. XMMs usually provide this functionality. Named after the 21st address line (A20), controlling the access to HMA. (1996-01-10)
A20 line         
The A20, or address 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.
List of A20 roads         
WIKIMEDIA LIST ARTICLE
A20 roads; A20 highway (Australia); A20 highway; A20 motorway; A-20 motorway; A20 freeway; A20 expressway; A20 express way; A20 road (United Kingdom); A20 road; A20 road (Australia); A 20 road; County Route A20; List of highways numbered A20
This is a list of roads designated A20. Roads entries are sorted in the countries alphabetical order.

Wikipedia

A20 line

The A20, or address 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 typically has a number of address lines equal to the base-two logarithm of the number of words in its physical address space. For example, a processor with 4 GB of byte-addressable physical space requires 32 lines (log2(4 GB) = log2(232 B) = 32), which are named A0 through A31. The lines are named after the zero-based number of the bit in the address that they are transmitting. The least significant bit is first and is therefore numbered bit 0 and signaled on line A0. A20 transmits bit 20 (the 21st bit) and becomes active once addresses reach 1 MB, or 220.