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Netroom (originally styled NETROOM) is a DOS memory manager produced by Helix Software Company in the 1990s. Introduced in August 1990, NETROOM was originally titled "LAN Memory Manager." Version 1.0 of NETROOM was a re-packaged version of Helix's HeadRoom with the HeadRoom Network Extensions, bundled together and targeted to network users.
An option ROM for the PC platform (i.e. the IBM PC and derived successor computer systems) is a piece of firmware that resides in ROM on an expansion card (or stored along with the main system BIOS), which gets executed to initialize the device and (optionally) add support for the device to the BIOS.
ImDisk Virtual Disk Driver is a disk image emulator created by Olof Lagerkvist. It is free and open-source software, and is available in 32- and 64-bit variants. It is digitally signed, which makes it compatible with 64-bit versions of Microsoft Windows without having to be run in Test mode.
EMM386.EXE can map memory into unused blocks in the upper memory area (UMA), allowing device drivers and terminate-and-stay-resident programs to be "loaded high", preserving conventional memory. The technique probably first appeared with the development of CEMM , included with Compaq's OEM MS-DOS for the Compaq Deskpro 386 in 1986.
CEMM, for Compaq Expanded Memory Manager was the first so-called PC "memory manager" for Intel 80386 CPUs, able to provide expanded memory (EMS) emulation by using the virtual memory features and the virtual 8086 mode of the CPU. It was present in Compaq DOS 3.10, shipping with the Compaq Deskpro 386 in September 1986. [1] [2]
In DR DOS 5.0 (1990) and 6.0 (1991), the driver is named HIDOS.SYS rather than HIMEM.SYS, like the corresponding DCONFIG.SYS or CONFIG.SYS directive HIDOS=ON. In FreeDOS , the matching file is named HIMEMX.SYS and can be loaded from the FreeDOS configuration file named FDCONFIG.SYS or CONFIG.SYS .
It competed with Quarterdeck's QEMM memory manager. It was manufactured by Qualitas. BlueMax was a special version designed for the IBM PS/2 with ROM compression to get the most of the Upper Memory Blocks. In 2022, the source code was made available on GitHub, and released under the GNU GPL v3 license by Bob Smith of Sudley Place Software. [2]
In computing, an input–output memory management unit (IOMMU) is a memory management unit (MMU) connecting a direct-memory-access–capable (DMA-capable) I/O bus to the main memory. Like a traditional MMU, which translates CPU -visible virtual addresses to physical addresses , the IOMMU maps device-visible virtual addresses (also called device ...
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