Document 1605
DESQVIEW

Description:
DesqView is a multi-tasking DOS based program that relies on
very specific uses of system memory.  Specifically, it
accomplishes its multi-tasking by bank-switching applications
in and out of conventional memory (much like Concurrent DOS XM)
and can use XMS UMB's (Upper memory blocks) and the HMA (High
Memory Area) for storing its own program code and data.  For
maximum performance of DesqView under DRDOS 6.0, one should use
QEMM386.SYS instead of EMM386.SYS and one should make sure that
nothing from DRDOS is taking control of the A20 line (that is,
using the HMA.)

QEMM386.SYS should be used instead of EMM386.SYS, because the
LIM  driver which is a part of QEMM386.SYS has been enhanced for
DesqView multi-tasking in conventional memory.

HIDOS.SYS can be used along with QEMM386.SYS (as with DRDOS 5.0)
to relocate the operating system, but, unlike DRDOS 5.0, it
takes more work than just using the /BDOS=AUTO switch to keep
DRDOS 6.0 out of the HMA.  To keep DRDOS 6.0 out of the HMA for
DesqView:

1)  Make sure that the /MH option is not used on any of the
DRDOS 6.0 commands that support it.  This includes SHELL and
SHARE.

2)  Make sure that the HIBUFFERS command is not used in the
CONFIG.SYS file.  This command will use the HMA even if the
Kernel is not put there with /BDOS=FFFF.

3)  Make sure that the /BDOS option reads: /BDOS=AUTO.

(NOTE: If one is unsure if the HMA is being allocated to DRDOS
6.0  instead of DesqView, one can use MEM /F before starting
DesqView. This command will display an empty box if DRDOS 6.0 is
not using the HMA.)

Example:
Here is an example CONFIG.SYS that will work properly with
DesqView:

SHELL=C:\DRDOS\COMMAND.COM C:\DRDOS6 /P /MU /E:512
BREAK=ON
BUFFERS=5
FILES=30
LASTDRIVE=M
HISTORY=ON, 256, ON, OFF, OFF
DEVICE=C:\QEMM60\QEMM386.SYS R:2 NOVIDEOFILL RAM ROM ST: FXST=F000
DEVICE=C:\DRDOS\HIDOS.SYS /B=AUTO
DEVICE=C:\QEMM60\LOADHI.SYS /R:3 C:\DRDOS\PCKWIN.SYS
DEVICE=C:\QEMM60\LOADHI.SYS /R:1 C:\MOUSE\MOUSE.SYS
DEVICE=C:\SSTORDRV.SYS
HIDOS=ON
