A20 handler - определение. Что такое A20 handler
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Что (кто) такое A20 handler - определение

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.
Alan B. Handler         
AMERICAN JUDGE
Alan Handler; Justice Handler
Alan B. Handler (born July 20, 1931) served as a New Jersey Supreme Court Justice from 1977 until 1999.

Википедия

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.