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The Commodore RAM Expansion Unit (REU) is a range of external RAM add-ons. At the time of introduction of the Commodore 128 home computer, two REUs were announced for that model; the 1700 (128 KB) and 1750 (512 KB) REUs. Later, Commodore introduced a third model, for their Commodore 64 model: the 1764 (256 KB) [1]
Functioning as a highly flexible and reusable memory extension library, DOS/4G allowed programmers to access extended memory without writing specialized code. It embeds itself in the executable file at linking time and executes before main application code, so usually DOS/4G initialization messages show up at launch.
Fragmentation of 0% means that all the free memory is in a single large block; fragmentation is 90% (for example) when 100 MB free memory is present but largest free block of memory for storage is just 10 MB. External fragmentation tends to be less of a problem in file systems than in primary memory (RAM) storage systems, because programs ...
PC Card is a parallel peripheral interface for laptop computers and PDAs. [1] The PCMCIA originally introduced the 16-bit ISA-based PCMCIA Card in 1990, but renamed it to PC Card in March 1995 to avoid confusion with the name of the organization. [2]
Expanded memory is an umbrella term for several incompatible technology variants. The most widely used variant was the Expanded Memory Specification (EMS), which was developed jointly by Lotus Software, Intel, and Microsoft, so that this specification was sometimes referred to as "LIM EMS". LIM EMS had three versions: 3.0, 3.2, and 4.0.
The high memory area (HMA) is the RAM area consisting of the first 64 KiB, minus 16 bytes, of the extended memory on an IBM PC/AT or compatible microcomputer. Originally, the logic gate was a gate connected to the Intel 8042 keyboard controller. Controlling it was a relatively slow process.
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