Editing QEMM (section)

===Limitations===

====Device driver limit====
LOADHI.SYS loads up to 1 device driver at a time in QEMM 4.23, 2 in QEMM 5, 32 in QEMM 6.

====MagnaRAM limit====
Maximum compression threshold setting is 100% for all versions of MagnaRAM 2.00-2.02, except for MagnaRAM 2.00 included with QEMM 8.00, which has the maximum setting of 80%.

====Memory limit====
* QEMM 5.0 can manage up to 16&nbsp;MB EMS, 16&nbsp;MB XMS.
* QEMM 6.0 can manage up to 64&nbsp;MB EMS, 64&nbsp;MB XMS.
* QEMM 6.02 can manage up to 128&nbsp;MB EMS, 128&nbsp;MB XMS. EMBMEM (16-bit) parameter limit was removed.
* QEMM 7.0-7.03 can manage up to 128&nbsp;MB EMS, 128&nbsp;MB XMS.
* QEMM 7.04, 7.5, 8.0-8.3 and 97 (aka QEMM 9.0) can manage up to 256&nbsp;MB EMS/XMS.

By default, QEMM 7.04 and above provide up to a total of 64&nbsp;MB RAM shared among XMS, EMS and VCPI memory, unless the USERAM= parameter is used.  For example, to allow access to up to 256&nbsp;MB EMS (or 256&nbsp;MB XMS), specify: QEMM386.SYS USERAM=1M-256M <ref>[http://www.delorie.com/djgpp/v2faq/faq3_10.html 3.10 How to get the most RAM for DJGPP programs?]</ref>

For QEMM 7.04 and above, the maximum addressable RAM is 256&nbsp;MB of memory, shared among XMS, EMS and VCPI memory. Initially, XMS allocates the entire 256&nbsp;MB and shares it with EMS and VCPI as needed, that is, as EMS and VCPI request memory blocks, XMS free memory is reduced by that same amount.<ref>[http://www.computing.net/answers/dos/qemm-problem/16804.html QEMM Problem] {{webarchive|url=https://web.archive.org/web/20090511001053/http://www.computing.net/answers/dos/qemm-problem/16804.html |date=2009-05-11 }}</ref>

====Optimize limit====
Versions up to QEMM 6.01 can process batch files up to 9KB, and 20KB in QEMM 6.02.

Batch file line limit is 512 for QEMM versions up to 6.02.

====Stealth DoubleSpace/D*Space====
Stealth D*Space does not support Windows 95 or later versions of DriveSpace.