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The term double buffering is used for copying data between two buffers for direct memory access (DMA) transfers, not for enhancing performance, but to meet specific addressing requirements of a device (esp. 32-bit devices on systems with wider addressing provided via Physical Address Extension). [5]
In computer science, a data buffer (or just buffer) is a region of memory used to store data temporarily while it is being moved from one place to another. Typically, the data is stored in a buffer as it is retrieved from an input device (such as a microphone) or just before it is sent to an output device (such as speakers); however, a buffer may be used when data is moved between processes ...
Without an IOMMU, the operating system would have to implement time-consuming bounce buffers (also known as double buffers [3]). Memory is protected from malicious devices that are attempting DMA attacks and faulty devices that are attempting errant memory transfers because a device cannot read or write to memory that has not been explicitly ...
SYSTEM.DAT, USER.DAT - Contains the Windows Registry; MSDOS.SYS - Contains some low-level boot settings and resources such as disabling double-buffering and the GUI logo; WIN.INI and SYSTEM.INI - Configuration files from Windows 3.1 which are processed in Windows 9x also; Virtual Machine Manager and configuration manager:
The operating system then loads the information from that page table entry into the TLB and restarts the program from the instruction that caused the TLB miss. As with hardware TLB management, if the OS finds no valid translation in the page tables, a page fault has occurred, and the OS must handle it accordingly.
SkyOS is a Unix-like operating system with a monolithic kernel. [3] The OS supports multiple users [4] and symmetric multiprocessing. [14] SkyOS has an integrated graphics subsystem with support for desktop compositing including double buffering and transparency. [8] SkyOS GUI also allows system-wide mouse gestures. [14]
By switching between main and shadow memory on alternate frames, double-buffered video could be used. Acorn provided a demonstration program in BASIC showing scrolling cloud animation with and without double buffering. The video game Firetrack would also use double buffering if shadow RAM was present.
However, SMARTDRV.EXE also includes a double-buffering driver that should be loaded through CONFIG.SYS. [2] Version 4.0 also introduced 32-bit disk access and could reduce its footprint in conventional memory (the first 640 kilobytes of memory which was critical to DOS ) by running in upper memory area (the 384 kilobytes of memory located ...