Making Hard Copy of the Document
================================

The documentation (DXP.DOC) in the package has been typeset with a 57-line
page so it will print nicely on most printers.

In order to print the documentation, you can type the following on the
command line:

copy dxp.doc prn

OR

type dxp.doc > prn


Disk eXPress 2.30 Images and Older Versions of Disk eXPress
===========================================================

Older versions of Disk eXPress have no knowledge of the Data Encryption
feature introduced in version 2.30.  Running an older version of Disk
eXPress against an encrypted and compressed image will cause it to crash.
For uncompressed but encrypted images, the data restored to diskettes will
be encrypted, and therefore, making the diskettes unusable.


Installation Recommendation
===========================

It is recommended you use either the 32-bit or the 16-bit version of
Disk eXPress.  If you maintain both versions on your hard drive under
32-bit OS/2, the recommended setup for your LIBPATH and PATH may look like
this:

LIBPATH=.;C:\DLL32;C:\DLL16; ... C:\OS2\DLL;C:\OS2\APPS\DLL; ... ;
SET PATH=C:\OS;C:\OS2\SYSTEM; ... C:\BIN32;C:\BIN16; ... C:\FAMBIN; ... ;


C:\DLL32  -- for holding 32-bit OS/2 DLLs
C:\DLL16  -- for holding 16-bit OS/2 DLLS
C:\BIN32  -- for holding 32-bit OS/2 executables
C:\BIN16  -- for holding 16-bit OS/2 executables
C:\FAMBIN -- for holding OS/2 family and dual mode executables

Copy DXP.EXE to C:\FAMBIN.  Rename DXP32.EXE to DXP.EXE and copy it under
C:\BIN32.

If you only use DOS, you can copy DXP.EXE to any subdirectory under your
current search path.


Disk eXPress 32-bit and Extremely Fast Systems
==============================================

On the average systems, the 32-bit OS/2 version of Disk eXPress will run
faster than the 16-bit version by about 30%.  However, on extremely fast
systems (486DX-50, 486DX2-66, and Pentium), you may notice the diskette
read/write thread running slower than the 16-bit version.  This has been
traced down to motherboard and floppy controller mismatch and/or incorrect
ISA bus timimg.  If you are using an ISA bus PC, make sure the bus speed
is set to 8MHz.


Self-Extracting Executable and non-DOS Diskette
===============================================

The self-extracting executable will not recognize and write to non-DOS
diskette.  Use a DOS formatted diskette, or use DXP or Xtract to write
to the non-DOS diskette.  You may need the /a switch to specify diskette
capacity if auto-sensing fails to detect the correct physical diskette
type.

The /a switch in Xtract is undocumented.  The syntax for using it to
specify a non-DOS diskette is the same as Disk eXPress.  Xtract is
available in the licensed version of Disk eXPress.

When running the 16-bit OS/2 version of Disk eXPress under OS/2 1.x, the
automatic diskette detection logic will not detect diskettes with non-
standard number of tracks due to the limitation of the floppy driver.
For instance, an 82 tracks diskette will be detected as having 80 tracks;
and therefore, the image file produced is incorrect.

When using DXP under DOS, the automatic diskette sensing routine limits
the detection of non-DOS diskette in either drive A or B.  External
diskette drives using drive letter other than A or B are not supported.
In this case, you must either use the /a switch to specify capacity or
use the OS/2 version of DXP.


Sector Skew Optimization and Old Floppy Hardware
================================================

Sector skew optimization may not work on old floppy drives which may have
very slow track-to-track access time; or on slow systems, such as a 286 PC
or even a low end 386SX.  If Disk eXPress is running slower with a sector
skew optimized diskette, reformat the diskette with regular FORMAT or use
the /f switch in the future instead.  Sector skewing has no appreciable
effects under DOS, since it does not support multi-threading.


New Addition to Disk eXPress: VMDISKX
=====================================

Starting with Version 2.20, Disk eXPress includes an additional program
called VMDISKX.  VMDISKX performs the reverse of VMDISK for making the
Virtual Machine Boot diskette for OS/2 2.x.  This program is provided
'as-is'.

Here is the help screen for VMDISKX:

VMDISKX  Version 1.02  02/08/94
(c) Copyright 1993-94 Albert J. Shan.  All Rights Reserved.

usage: VMDISKX VMB_Image drive: [/f]

 VMB_Image  Diskette image file created by VMDISK
     drive  Target diskette drive
        /f  Format the target diskette (optional)

Example: VMDISKX dos.img a: /f