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Icon/386 for MS-DOS
This diskette contains files for Version 8.5 of Icon/386 for MS-
DOS as follows:
lharc.exe de-archiving utility
icon.lzh executable binaries
docs.lzh archived documents
samples.lzh archived sample programs and data
readme this file
The executable files should be unloaded on a place on your
PATH specification. For example, if this diskette is mounted in
your A drive and you set your current directory to where you want
the files, the following unloads the executable binary files:
a:lharc x a:icon.lzh
The documents and sample programs can be unloaded in a similar
fashion to the executable files.
More information on running Icon/386 is contained in
IPD184.DOC in docs.lzh.
Icon/386 incorporates a DOS extender product from Intel Corp.
This DOS extender enables your 80386 system to run in 32-bit pro-
tected mode, with access to all extended memory. It will operate
with 80386, 80386SX, 80486, and 80486SX processors.
This version of Icon/386 can be used with the following memory
managers active:
* DOS 5.0's EMM386 * DOS 5.0's DOS=HIGH
* Qualitas' 386MAX v6.0 * Quarterdeck's QEMM 386 v6.0
* Helix Software's NETROOM v2.1 * DOS 5.0's HIMEM.SYS
While it does support the VCPI standard, the current version does
not run under DESQView 386.
Icon/386 can also be used with DPMI-compliant hosts, such as a DOS
window when Windows 3.0 is started in enhanced mode. But note that a
special driver (VEMD.386, provided with Icon) must be installed to
provide floating point support when operating under Windows on systems
lacking a floating-point coprocessor.
Icon/386 may be used if you are running native DOS (no expanded
memory manager, no multi-tasking operating system shell). It is
compatible with DOS 5.0 when portions of DOS are loaded into the High
Memory Area. Icon runs only in extended memory above 1 MB. Therefore,
a 2 MB 386 is the minimum configuration capable of running Icon/386.
In addition to operation with native MS-DOS, Icon/386 is compatible
with programs that use Int 15h to allocate extended memory (such as
VDISK.SYS RAM disks), or that use HIMEM.SYS to provide XMS extended
memory services.
Icon/386 is configured with a particular "region size." The
region size determines the maximum amount of memory (physical and
virtual) that can be used when running under a DPMI host. By default,
the region size is set to 3 megabytes. The document CONFIG.DOC
describes how to use Intel's configuration utility (MODXCONF.EXE)
to alter the region size.
Intel Corporation permits their DOS extender, configuration
utility (MODXCONF.EXE), and Windows floating point driver VEMD.386
to be distributed in public-domain software. There are no restrictions
on your distribution of this software.
Virtual Memory
The Intel DOS Extender used in Icon/386 contains a virtual memory
manager. Virtual memory provides swapping to disk, allowing you to run
programs larger than physical memory. However, Icon's memory organi-
zation and storage regeneration strategy are likely to result in
disk thrashing and unacceptable levels of performance.
Instructions for configuring virtual memory are contained in file
CONFIG.DOC.
Known Problems
This version of the Intel DOS extender has these limitations:
1. When operating under Windows 3.0, typing Control-Break will
crash the application.
2. It does not operate properly with DESQView 386.
3. It does not operate properly in a DOS window under OS/2 2.0.
History
Previous versions of Icon/386 were distributed with a DOS extender
from PharLap Software, Inc. Licensing restrictions imposed by PharLap
Software, Inc. precluded a public-domain release of Icon/386, and it
was distributed under a "shrink-wrap" license. The PharLap version
has been discontinued in favor of the Intel version with its full
public-domain status.