Everything about Extended memory
Section of computer memory in PC compatibles
In DOS memory management, extended memory refers to memory above the first megabyte (220 bytes) of address space in an IBM PC or compatible with an 80286 or later processor. The term is mainly used under the DOS and Windows operating systems. DOS programs, running in real mode or virtual x86 mode, cannot directly access this memory, but are able to do so through an application programming interface (API) called the Extended Memory Specification (XMS). This API is implemented by a driver (such as HIMEM.SYS) or the operating system kernel, which takes care of memory management and copying memory between conventional and extended memory, by temporarily switching the processor into protected mode. In this context, the term "extended memory" may refer to either the whole of the extended memory or only the portion available through this API. Wikipedia →
🧭 Start here: a 6-step reading path
- Read the overview: Extended memoryA 5-minute orientation
- Skim a recent paper: Externalized memory in slime mould and the extended (non-neuronal) mindInfluential work since 2022
- Pick up a classic book: TNT DOS-extender reference manualThe most-reprinted book on the subject
- Read the landmark paper: Stratospheric Memory and Skill of Extended-Range Weather ForecastsCited 468 times
- Go sideways: Conventional memoryA closely related topic
- Go sideways: RAM limitA closely related topic
📖 Definitions
Noun The extent of memory above the first megabyte in the address space of later PCs
🗂️ The subject at a glance
🏆 Landmark papers (most cited)
Stratospheric Memory and Skill of Extended-Range Weather Forecasts
Collective memory, group minds, and the extended mind thesis
Intrinsic content, active memory and the extended mind
AN EXTENDED OV MODEL WITH CONSIDERATION OF DRIVER'S MEMORY
Memory: An Extended Definition
Modelling Nonlinear Relationships between Extended-Memory Variables
Distributed selves: personal identity and extended memory systems
Small Matrix Path Integral with Extended Memory
🆕 Influential since 2022
Externalized memory in slime mould and the extended (non-neuronal) mind
Sensorless Control of Variable Flux Memory Machines Based on Improved Extended EMF Model and Adaptive Extended State Observer
Extended switching endurance of phase change memory through nano-confined cell structure
CDxLSTM: Boosting Remote Sensing Change Detection With Extended Long Short-Term Memory
Memory B cell–guided extended interval dosing of ocrelizumab in multiple sclerosis
📚 Books worth reading
- 📕TNT DOS-extender reference manual · 1993
- 📕New York City Health and Hospitals Corporation, long-term care activities at Bird S. Coler and Goldwater Memorial Hospitals · 1986
Ranked by number of editions on Open Library, a rough measure of how lasting a book is.
🔗 Related topics
- Conventional memory In DOS memory management, conventional memory, also called base memory, is the first 640 kilobytes of the memory on IBM PC or compatible systems. It is…
- RAM limit The maximum random access memory (RAM) installed in any computer system is limited by hardware, software and economic factors. The hardware may have a…
- Expanded memory In DOS memory management, expanded memory is a system of bank switching that provided additional memory to DOS programs beyond the limit of conventional…
- DOS memory management In IBM PC compatible computing, DOS memory management refers to software and techniques employed to give applications access to more than 640 kibibytes…
- X86 memory segmentation x86 memory segmentation is a term for the kind of memory segmentation characteristic of the Intel x86 computer instruction set architecture. The x86 architectur…
- Upper memory area In DOS memory management, the upper memory area (UMA) is the memory between the addresses of 640 KB and 1024 KB (0xA0000–0xFFFFF) in an IBM PC or compatible…
- DESQview DESQview (DV) is a text mode multitasking operating environment released by Quarterdeck Office Systems in 1985 which enjoyed modest popularity in the late…
- Protected mode In computing, protected mode, also called protected virtual address mode, is an operational mode of x86-compatible central processing units (CPUs). It…