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It is set to non-passing for the execution of older programs that rely on the wrap-around. At boot time, the BIOS first enables Gate-A20 when it counts and tests all of the system memory, and then disables it before transferring control to the operating system. Originally, the logic gate was a gate connected to the Intel 8042 keyboard ...
The Apollo flight computer was the first computer to use silicon IC chips. [15] While the Block I version used 4,100 ICs, each containing a single three-input NOR gate, the later Block II version (used in the crewed flights) used about 2,800 ICs, mostly dual three-input NOR gates and smaller numbers of expanders and sense amplifiers.
The default OperandSize and AddressSize to use for each instruction is given by the D bit of the segment descriptor of the current code segment - D=0 makes both 16-bit, D=1 makes both 32-bit. Additionally, they can be overridden on a per-instruction basis with two new instruction prefixes that were introduced in the 80386:
Some extremes are FIC PA-2012 and Shuttle HOT-595 which have 1024 KB (some have 512 KB) L2 cache memory and have three 168-pin DIMM slots (1 AGP, 4 PCI, 2 ISA). Tyan Trinity ATX S1592S has three 168-pin DIMM slots plus four 72-pin SO-DIMM slots (1 AGP, 4 PCI, 3 ISA). Apollo VP3 chipset was sold by Soyo also under name ETEQ 6628 chipset. [7]
Core rope memory is a form of read-only memory (ROM) for computers.It was used in the UNIVAC I (Universal Automatic Computer I) and the UNIVAC II, developed by the Eckert-Mauchly Computer Corporation in the 1950s, as it was a popular technology for program and data storage in that era.
Multics ("MULTiplexed Information and Computing Service") is an influential early time-sharing operating system based on the concept of a single-level memory. [4] [5] It has been written that Multics "has influenced all modern operating systems since, from microcomputers to mainframes."
In computing, protected mode, also called protected virtual address mode, [1] is an operational mode of x86-compatible central processing units (CPUs). It allows system software to use features such as segmentation, virtual memory, paging and safe multi-tasking designed to increase an operating system's control over application software.
Domain/OS is the discontinued operating system used by the Apollo/Domain line of workstations manufactured by Apollo Computer. It was originally launched in 1981 as AEGIS, and was rebranded to Domain/OS in 1988 when Unix environments were added to the operating system. It is one of the early distributed operating systems. [2]
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