high memory area , HMA (Abkürzung)

It runs in real mode but can make use of the high memory area.

The A20 handler is software controlling access to the high memory area.

You also don't have access to upper memory blocks or the high memory area.

Extended memory is not accessible in real mode (except for a small portion called the high memory area).

Windows/286 would simply not use the high memory area since none exist on an 8086-class processor; however, EMS could still be used, if present.

The phrase is also sometimes used as shorthand for the High Memory Area, which is a different concept entirely.

Specifies whether to load DOS into the high memory area and/or use upper memory.

SYS driver that enables DOS to use the high memory area.

High memory area (HMA)

High Memory Area (HMA)

The first line causes DOS to use the high memory area and upper memory when possible, freeing up more conventional memory for applications to use.

Like prior versions of Windows, Windows/286 2.1 used the real-mode memory model, but was the first version to support the High Memory Area.

In MS-DOS, high memory area managers, such as HIMEM.

The total operating system footprint was around 20 KB, most of DOS residing in the high memory area (HMA).

Importantly, support for swapping non-resident programs was added-onto the hard disk on all computers and into the high memory area on machines equipped with a 286 CPU.

This roughly 64-kilobyte region of memory was known as the High Memory Area, and later versions of MS-DOS could use it to increase available low memory.

The next stage in the evolution of DOS was for the operating system to use upper memory blocks (UMBs) and the high memory area (HMA).

These memory areas are referred to as the high memory area (HMA) and the upper memory area (UMA; also referred to as upper memory blocks or UMBs).

DOS 5 supported the use of the High Memory Area (HMA) and Upper Memory Blocks (UMBs) on 80286 and later systems to reduce its conventional memory usage.

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.

As of MS-DOS 5.0, was introduced and could be used to load the DOS kernel code into the High Memory Area (HMA) to increase the amount of available conventional memory by specifying in .

This provided a way to copy data to and from extended memory, access to the 65520-byte High Memory Area (HMA) directly above the first megabyte of memory and the Upper Memory Block (UMB) area.

First, the DR DOS kernel and structures such as disk buffers can be located in the High Memory Area (HMA), the first 64 KB of extended memory which are accessible in real mode due to an incomplete compatibility of the 80286 with earlier processors.