QEMM v.6

 Document 1608

QEMM v.6


Initials:

MDC

11/2/91

DRDOS 6.0


Keywords:

QEMM

QEMM386.SYS

HIDOS.SYS

STEALTH

XMS

MEMORY


Description:

        The third party compatability 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 DRDOS 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.


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