Document 1608
QEMM v.6

Description:

The third party compatibility unit at Quarterdeck reports that
DR DOS 6 and QEMM386 v6 are compatible. OPTIMIZE does not
recognize all of the CONFIG.SYS enhancements offered by DR DOS
6, such as SWITCH, but will work properly otherwise

We have the most recent version of QEMM (v.6.01) , and it seems
to be working very well on the new 386/33mhz. AMD 386/40mhz.
Processor machines with AMI BIOS we have.

There's been a lot of talk about their new and major feature
STEALTH. The STEALTH technology actually relocates/re-maps ROM's
off into extended memory, thus freeing up more contiguous upper
memory for use by QEMM (as much as a 128k block on the AMD
386/33mhz. machine.) STEALTH has two specific modes of operation
specified by using ST:F or ST:M on the QEMM device driver line. 
It is important to understand that an advanced feature like this
is difficult to troubleshoot.  The QEMM documentation (written,
and on-line via the OPTIMIZE program) gives some very helpful
"first-step" debugging hints.

If you are using QEMM with DR DOS 6.0 and are seeing strange
behavior, try removing the ST option on the QEMM device driver
line altogether.

STEALTH confuses many disk caches which use expanded memory
(EMS) because STEALTH technology uses the LIM page frame in an
advanced, non-standard way. To prevent data corruption advanced
hard disk reads and writes (/H-) are automatically disabled by
SuperPCK when STEALTH is used. Quarterdeck, Multisoft and
Digital Research are working together on this problem.