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1991-03-12
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ID:RM REMM.SYS Driver Optimization
Quarterdeck Technical Note #101
by Myke Keefe Revised: Aug 27, 1990
Owners of the AST line of computers and/or memory boards on 8088,
8086, and 80286 based computers need to run the program REMM.SYS
to activate the expanded memory features they provide.
REMM.SYS is installed in your CONFIG.SYS file by adding the line:
DEVICE=REMM.SYS
If you have a 286 based system with only 640K of RAM, then you
should set aside 128K of memory as exTENded and load QEXT.SYS
(Quarterdeck Extended Memory Manager) in your CONFIG.SYS file
after REMM.SYS.
This adds support for a new memory specification called XMS
(eXtended Memory Specification) which can be used in addition to
EMS to provide memory beyond 640K to your programs.
If your computer already has more than 768K of memory (other than
exPANDded), you do not need to allocate any memory from the AST
memory board as exTENded.
To reduce the risk of memory conflict, REMM will not make
available all areas that you can utilize with Quarterdeck's
DESQview and QRAM products. Usually you can reclaim 32K or more
by utilizing unused video memory. We feel that the REMM driver
is too conservative in reserving video areas which can be used.
If you have any options installed in your computer like network
boards or non-standard video adapters or hard disk controllers or
other "unusual" features you should proceed with caution. If you
have such things then please be familiar with REMM's /X (eXclude)
parameter as you will have to probably have to use it to prevent
a memory conflict.
Check the owner's or installation manuals for these types of
adapters/options to determine if they use any memory between 640K
and 1024K as ROM or if they set up some sort of RAM buffer in
reserved memory. These areas will probably need to be eXcluded
from use by REMM.SYS
REMM.SYS can be told to use areas with the /L (incLude) parameter
on REMM.SYS. This tells REMM to use an area that it may not
normally use by default.
You can also minimize the amount of memory that REMM.SYS itself
uses by limiting Process IDs and Contexts. We have found that
most users generally use only 8-10 of either PIDs and Contexts
and don't need all 64 or 255 that REMM will allocate by default.
To limit PIDs and Contexts you should use the parameters /P=16
and /C=16. This is shown in the following examples.
To include the unused monochrome areas available when you only
have an EGA or VGA adapter attached to a COLOR monitor use this
example:
DEVICE=REMM.SYS /P=16 /C=16 /L=B000-B7FF
If you are using a Monochrome or Hercules Graphics Adapter, you
can gain 64K of additional memory by including A000-AFFF. For
example:
DEVICE=REMM.SYS /P=16 /C=16 /L=A000-AFFF /X=B000-BFFF
A whole 96K of RAM can be reclaimed if you have a Color Graphics
adapter (CGA) by using this example:
DEVICE=REMM.SYS /P=16 /C=16 /L=A000-B7FF /X=B800-BFFF
If you have an AST Premimum computer you can use /S=E000 to place
the EMS Page Frame at E000 and thus get 64K more memory for
DESQview or QRAM.
For example, if you had a Premimum 286 with a VGA the line would
be: DEVICE=REMM.SYS /p=16 /c=16 /L=B000-B7FF /S=E000
High Speed Communications in DESQview note!
If you intend to use baud rates greater than 2400 baud while
using Quarterdeck's DESQview, you may want to use the older REMM
3.x versions. These older versions of REMM.SYS only support EEMS
(AST's proprietary expanded memory specification), but operate
much faster than the newer versions, which also support the more
popular EMS 4.0 specifications. AST may speed up their EMS 4.0
drivers in the future, so you may want to check their BBS for
newer versions.
Multi-tasking With REMM.SYS
AST Memory Products support multi-tasking beyond 640K if set up
properly. Please refer to EMS40.TEC, another Quarterdeck White
Paper or for DESQview users, Appendix B, especially page 149 of
the DESQview 2.0 manual
All versions of REMM.SYS and further information can be
downloaded from the AST Research BBS: (714) 727-4723. I highly
reccomend downloading REMMINFO.TXT for more information about the
Rampage Expanded Memory Manager.
Copyright (C) 1991 by Quarterdeck Office Systems
* * * E N D O F F I L E * * *