Category : Utilities for DOS and Windows Machines
Archive   : UMBDVR22.ZIP
Filename : UMB_EMS4.DOC

Output of file : UMB_EMS4.DOC contained in archive : UMBDVR22.ZIP
UMB_EMS4.DOC Version 5.22 02/20/92 Page 1

UMB_EMS4.SYS Device Driver
EMS simulator for DOS 5.0 on 286 / 386 / 486 systems
Copyright (C) 1991, 1992 All Rights Reserved

Christopher Blum CompuServe: 76625,1041
1022 East Wayne Avenue INTERNET: [email protected]
Wooster, Ohio 44691 BIX: cblum


UMB_EMS4.SYS carries no warranties expressed or implied. It is
solely up to the user to determine its suitability for use on his/her
This program is distributed as a self-extracting file containing
the device driver and its associated documentation as a part of the
UMB_DRVR.SYS package. Copying and redistribution is encouraged, but must
be the original, unmodified file containing this documentation, and the
transfer must not carry any fee or charge specific to this program: i.e.
general BBS access or line charges are OK, but no 'download fee' or
similar charge. This means that BBS operators may post this file for
download, but may not charge a specific fee for it, and 'Distribution
houses' may charge a disk-duplication fee, but not a specific charge for
the program.
UMB_EMS4.SYS is made available on a 'try before you buy' basis.
It is not crippled in any way, and has no 'advertising'. The latest
version will be available on CompuServe in the IBM forum ( 'GO IBMSYS',
lib 1 ).
Personal use license ( U.S. funds ) is $25 which should be mailed
to the above address if the program is used after a reasonable trial
period ( 30 days ). Please use the registration form at the end of the
UMB_DRVR.DOC document. Users who register receive the latest version of
the program, and may at any time send a self-addressed *and postpaid*
diskette mailer and a diskette to receive further updated versions.
Corporate users must contact me for corporate rate or site license


Technical support, including pre-registration questions or install
assistance, is available at your expense at the above telephone number.
Please be aware that I am in the Eastern US time zone ( GMT-4 or GMT-5
depending on season ) and try to call at a reasonable hour: i.e. 9 AM to
Noon, 1 PM to 5PM, or 7 PM to 10 PM. Saturday is OK, but *PLEASE* avoid
Sundays. I can also be contacted via Email on CompuServe, BIX and
INTERNET ( IDs above ) - I monitor my mail almost every day. It is not
necessarily a good idea to leave me messages on CompuServe in the forum
sections unless your question or discussion is of general interest. The
Postal Service may also be used ( address above ).
UMB_EMS4.DOC Version 5.22 02/20/92 Page 2


UMB_EMS4.SYS is a device driver providing EMS simulation from XMS
( HIMEM.SYS ) extended memory. It is a software implementation of the
LIM 4.0 standard, implementing all features of the specification except
page aliasing, which requires actual hardware support.
All XMS extended memory is considered to be available also as EMS.
The XMS memory is dynamically configured to EMS and back as programs
open and close EMS handles. You should see, when you do a MEM display,
that the EMS available and XMS available track with each other.
The driver must be installed *AFTER* UMB_DRVR.SYS and HIMEM.SYS
have been installed, preferrably using the DEVICEHIGH command to load
into upper memory. It requires about 72K of memory to initialize, and
takes no parameters.


UMB_EMS4 has been run on 286, 386 and 486 systems with excellent
results. It will run on any system supported by UMB_DRVR.SYS, DOS 5.0
and the HIMEM.SYS XMS server.

Do *NOT* use simulated EMS provided by UMB_EMS4 for disk cache
programs such as PC-Quick, HyperDisk, SMARTDRV.SYS, etc. They will work
better with extended memory than simulated EMS ( see also following ).

The driver is Windows-386-enhanced-mode-aware, but you need to
start Windows in enhanced mode using 'WIN /3' ( UMB_EMS4 will back
itself out at Win init and reinstall at Win exit, but you must force
enhanced mode ) if you want it. The driver will not allow Windows to
start in enhanced mode if any simulated EMS users are active. This is
to allow Windows full use of extended memory, and further explains why
you can't have any cache programs use EMS if they need to run while
Windows is active. This can also affect shell programs or COMMAND.COM
replacement programs such as 4DOS. If you have a choice, select to use
extended memory for any such applications.

I *STRONGLY* suggest that you set your XMS handle count to 64 by
using /NUMHANDLES=64 for HIMEM.SYS, because the driver uses XMS handles
and the EMS 4.0 specification says you should have a minimum of 64. It
will work with the HIMEM.SYS default of 32, but there is some chance
that programs which normally would run might not in that environment.
UMB_EMS4.DOC Version 5.22 02/20/92 Page 3


If you're interested, here are some benchmark figures, run on a
16Mhz 386sx with Chips & Technologies NEATsx chip set with 4MB memory.
The hardware figures below reflect the NEATsx EMS facilities using Chips
and Technologies NEAT EMS driver version 2.0 and 2MB EMS.

*** PC Magazine Labs Benchmark 6.0

Hardware UMB_EMS4
-------- --------
EMS read 527.83 12.80 ( KB/sec )
EMS write 527.83 12.80

*** MOVETEST ( PC Labs EMS Move test, 256KB move timing in seconds )

- 64 byte records - -- 128KB records --
Hardware UMB_EMS4 Hardware UMB_EMS4
-------- -------- -------- --------
EMS => Conventional 1.81 1.42 .05 .05
Conventional => Conventional .71 .65 .05 .05
Conventional => EMS 1.86 1.42 .05 .05
EMS => EMS 1.86 1.64 .05 .05

*** Disk defragmentation program
( 100MB drive, 80MB data. Program run two times, organizing data in
two different orders. Identical initial data for all runs. Program
used 2 MB of EMS or Extended memory for buffers )

Run #1 Run #2 Average ( times in min:sec )
------ ------ -------
EMS ( Hardware ) 7:03 7:15 7:09
EMS ( EMM386 ) 7:15 7:32 7:24
Extended ( XMS ) 8:53 9:14 9:04
EMS ( UMB_EMS4 ) 11:50 11:05 11:28

Don't let these figures scare you... most programs tested run very
well with UMB_EMS4 and show little performance difference. The above
figures are 'worst case' and do not reflect the average program. Many
programs such as Quattro Pro 3.0, Lotus, DBase, Paradox, a selection of
games, several TSRs including a print spooler, and various others have
been tested with no problems.
UMB_EMS4.DOC Version 5.22 02/20/92 Page 4


installing. Also, make sure you have backed-up your system and that you
have a diskette you can boot from in case you have problems with your
CONFIG.SYS settings.
Installation is via the lines:


The driver will print a status report at initialization, and self-
explanatory error messages if installation fails.

If you do not have enough upper memory to load UMB_EMS4 high, you
may use DEVICE= to load into conventional memory, but it is much better
to load it high if possible. Rearranging your CONFIG.SYS to do so is
highly suggested.

Again, as with any new software, *MAKE SURE YOUR SYSTEM IS BACKED
UP* and verify the operation of your programs. It is impossible for me
to test all configurations and programs. If you have problems, let me
know and I will try to straighten them out.


Word Perfect version 5.1 crashes if you use its default EMS 4.0
support. This can be avoided by either using the execute command:
WP /32
when running it, or the command:
in the AUTOEXEC.BAT file at bootup. Either of these actions tells Word
Perfect to use LIM 3.2 calls only. I am in contact with Word Perfect
Corporation and am working on the problem.


5.22 [02/20/92] - Initial release version.


  3 Responses to “Category : Utilities for DOS and Windows Machines
Archive   : UMBDVR22.ZIP
Filename : UMB_EMS4.DOC

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: