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Syntax
Displays the amount of used and free memory in your system.
MEM [/CLASSIFY | /DEBUG | /FREE | /MODULE module name] [/PAGE]
| /CLASSIFY or /C |
Classifies programs by memory usage. Lists the size of programs, provides a summary of
memory in use, and lists largest memory block available. |
| /DEBUG or /D |
Displays status of all modules in memory, internal drivers, and other information. |
| /FREE or /F |
Displays information about the amount of free memory left in both conventional and
upper memory. |
| /MODULE or /M |
Displays a detailed listing of a module's memory use. This option must be followed by
the name of a module, optionally separated from /M by a colon. |
| /PAGE or /P |
Pauses after each screen full of information. |
Examples
mem
This would display information about your memory
as seen in the below examples.
Microsoft Windows 95
and Windows 98 example output:
| Memory Type |
Total |
Used |
Free |
| --------------- |
------ |
------ |
----- |
| Conventional |
640k |
52k |
588k |
| Upper |
0k |
0k |
0k |
| Reserved |
384k |
384k |
0k |
| Extended (XMS) |
31,744k |
168k |
31,576k |
| --------------- |
------ |
------ |
------ |
| Total memory |
31,768k |
168k |
31,576k |
| |
|
|
|
| Total under 1 MB |
640k |
52k |
588k |
Total Expanded (EMS)
32M
(33,046,528 bytes)
Free Expanded (EMS)
16M
(16,777,216 bytes)
Largest executable program size 588K
(602,512 bytes)
Largest free upper memory block 0K
(0 bytes)
MS-DOS is resident in the high memory area.
Windows 2000 and Windows
XP example output:
655360 bytes total conventional memory
655360 bytes available to MS-DOS
633872 largest executable program size
1048576 bytes total contiguous extended memory
0 bytes available contiguous extended memory
941056 bytes available XMS memory
MS-DOS resident in High Memory Area
mem /f
Display the amount of conventional memory free.
Issues
When using the mem /c command from a DOS window in
Windows, the user will have no upper blocks as illustrated in the
above example. This is caused because Windows reserves all global upper memory blocks for
Windows itself.
MS-DOS 6.2 and above will
not accept or recognize more than 64 MB of ram when
typing mem.
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