| Short for High
Memory Area, HMA is the first 64KB (65,520 bytes) of extended memory above the first 1MB of
memory found on IBM compatible computers. The HMA can be used to swap
programs from conventional memory into HMA causing the computer to
think more conventional memory is available on the computer.
In MS-DOS, the HMA can be accessed using Microsoft's
HIMEM.SYS file and specifying the DOS=HIGH command in the config.sys.
Additional information about the Autoexec.bat and Config.sys can be
found on our Autoexec.bat / Config.sys page.
Early computers had issues with HMA and the keyboard controller
that caused A20 errors. Additional information about this error and
how to resolve it can be found on
document CH000383.
Additional information about the PC memory as well
as a diagram can be found on RAM Diagram
page.
Also see: Memory definitions
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