Hall of Fame/HallofFameCDROM.cdr/window/dos4wind.lzh/DOS40.TXT

Text File | 1989-06-23 | 7KB | 174 lines

Running Windows with DOS 4.0x

Windows/286 and Windows/386 will run successfully with PC
DOS 4.01 and MS-DOS 4.0x.  To ensure optimal performance of
Windows, DOS must be properly configured.  Issues common to
both include:

                DOS version/Windows version
                DOS shell

Issues specific to Windows/286 include:

                Memory managers
                     XMA2EMS.SYS (PC-DOS)
                     XMAEM.SYS (PC-DOS)
                    EMM386.SYS (MS-DOS)
                BUFFERS and FASTOPEN


DOS version/Windows version

Windows/386 will function correctly with IBM PC-DOS version
4.01 only if certain conditions are met.  You must have PC
DOS version 4.01.  Version 4.0 will not work correctly with
Windows/386.    You must also be using Windows/386 version
2.1 (files dated 9/7/88) or 2.11.  These versions of
Windows/386 will also work correctly with MS-DOS 4.0 or
higher.

Windows 2.03 and Windows/286 versions 2.1 or 2.11 will work
with either PC-DOS 4.0 or 4.1 and MS-DOS 4.0 or higher.

DOS shell

Windows/286 and Windows/386 may be run from the DOS Shell.
However, a price is paid in doing so.  The DOS Shell uses
conventional DOS memory (memory in the first 640K of the
computer).  This conventional memory, once used by the DOS
Shell, is no longer available to Windows.  This may result
in "out of memory" error messages when using Windows/286.

Memory Managers

PC-DOS and MS-DOS have memory managers that convert extended
memory to LIM 4.0 expanded memory.  PC-DOS includes two
device drivers called XMA2EMS.SYS and XMAEM.SYS.  MS-DOS
includes these drivers and another driver named EMM386.SYS.
These drivers are used in specific situations and must be
configured properly for operation with Windows.

XMA2EMS.SYS and XMAEM.SYS

The XMA2EMS.SYS and XMAEM.SYS drivers are for use with IBM
memory boards.  They cannot be used with non-IBM memory
boards.  The drivers may be used with Windows/286 but should
not be used with Windows/386.

These drivers work in combination with any of the following
memory adapter boards:

1. IBM 2-megabyte Expanded Memory Adapter
2. IBM Personal System/2 80286 Expanded Memory Adapter/A
3. IBM Personal System/2 80286 Memory Expansion Option
4. IBM (or compatible) PS/2 Model 80 or Model 70 with
extended memory

XMAEM.SYS:  The XMAEM.SYS device driver is for use on the
IBM PS/2 Model 70 or Model 80.  It provides emulation of the
80286 Expanded Memory Adapter/A.  It does this by using
80386 memory map registers in conjunction with extended
memory.  This driver must be used prior to using the
XMA2EMS.SYS driver which provides LIM 4.0 expanded memory.

XMA2EMS.SYS    :  This is a device driver that supports the
Lotus, Intel, and Microsoft (LIM) Expanded Memory
Specification (EMS) 4.0 under MS-DOS Version 4.00.  If you
are using this driver on a IBM PS/2 Model 70 or Model 80 you
must specify the XMAEM.SYS device driver before XMA2EMS.SYS
in your CONFIG.SYS file.  To properly configure this device
driver for your machine, refer to the IBM PC-DOS 4.0 manual.

Support Issues:  The two major support issues related to the
use of Windows/286 and the PC-DOS 4.0 memory managers are
EMS pageframe conflicts and use of the Windows SMARTDrive,
RAMDrive, and HIMEM.SYS.

EMS pageframe conflicts are resolved by carefully reviewing
your computer's use of memory.  This is best done by using
the IBM Reference Setup disk and referring to the
documentation that accompanies accessory boards that you may
be using.  These resources provide the memory addresses of
boards such as hard disk driver controllers, tape backup
controller cards, connectivity boards, network boards, video
display adpater boards, and so on.  If these boards are
located within the same memory range that is used for the
EMS pageframe, you will encounter problems.  To resolve
these problems you must exclude these addresses from use by
the pageframe.  Refer to the IBM PC-DOS 4.0 manual for
specific information regarding how to do this with the
XMAEM.SYS driver.

SMARTDrive and RAMDrive may be used with PC-DOS 4.0 if
loaded into expanded memory.  If either of these utilities
precede the IBM memory managers in the CONFIG.SYS file, the
computer may not boot or continually reboot each time it
reads the CONFIG.SYS file.  To properly use these utilities,
place them after the IBM memory managers (XMA2EMS.SYS and
XMAEM.SYS).  They must also be loaded into expanded memory.
To place SMARTDrive in expanded memory use the /a switch
(refer to page 228 of the Windows User's Guide for
additional information).  To place RAMDrive in expanded
memory use the /a switch also (refer to the file
RAMDRIVE.TXT included with the Windows diskettes).

The Microsoft extended memory manager, HIMEM.SYS can not be
used in conjunction with XMA3EMS.SYS or XMAEM.SYS.  It
simply will not work due to the proprietary nature of IBM's
XMA memory.

EMM386.SYS

EMM386.SYS is a memory manager that is provided with MS-DOS
4.01.  It allows 80386 systems to emulate LIM 4.0 expanded
memory.  It may be used on any 80386 system that is
compatible with the IBM AT standard hardware/software
interface.  It should not be used on the IBM PS/2 computers
or compatibles.  To install the EMM386.SYS you must place a
command line in the CONFIG.SYS.  Refer to the README.TXT
file on the MS-DOS 4.0 Operating 2 diskette (5.25") for
detailed instructions.  Do not use EMM386.SYS with
Windows/386.  It may only be used in conjunction with
Windows/286.

Support  Issues:  EMM386.SYS shares the same support issues
as do the IBM memory managers as stated above.  However, the
approach to these issues is slightly different.

EMS pageframe conflicts are usually resolved by the driver.
It is capable of detecting addresses between A000 and E000
that are used by adapter boards.  If it does not correctly
detect these addresses then you may use the X or Mx
switches.  The X switch is used to exclude a specific memory
range.  The Mx switch is used to locate the beginning of the
64K pageframe at a specific location.  The key to using
these switches is knowing the addresses of all adapter
cards.  This is sometimes easier said  than done.  Two
methods for finding these addresses are: 1.) the
documentation for the adapter cards, and 2.) third party
utility programs that map memory from A000 to FFFF.

SMARTDrive and RAMDrive may be used with WIndows in either
extended or expanded memory.  If you want to place them in
expanded memory then be sure to place them after the
EMM386.SYS driver in the CONFIG.SYS.

The XMS driver HIMEM.SYS works with the EMM386.SYS driver.
However, you should use the HIMEM.SYS driver that is
supplied with MS-DOS 4.01.  This precaution ensures that you
are using the most current HIMEM.SYS.

BUFFERS and FASTOPEN

PC-DOS and MS-DOS 4.0 are capable of utilizing expanded
memory for BUFFERS and FASTOPEN.  This capablity will not
interfere with the operation of Windows providing that it
does not interfere with the EMS pageframe.  This is
especially important with Windows/386.  For instance, assume
that you are using PC-DOS 4.0 have used pages P254 and P255
(reserved for use by BUFFERS and FASTOPEN) in conjunction
with XMAEM.SYS.  If using these pages reduces the number of
remaining pages to less than four then Windows/386 will not
be able to establish a pageframe.