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1985-10-03
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*** HOT-DOS ***
Demonstration Version 1.04D
Copyright (C) 1985
Robert Best
The following documentation describes the operation of HOT-DOS, a small but
powerful program that, with the press of the LEFT-SHIFT -- RIGHT-SHIFT
combination, allows any currently executing program to be temporarily
suspended so that a second copy of COMMAND.COM can be loaded and run in the
background (the aptly named HOT-DOS partition.)
To load HOT-DOS simply type HOTDEMO at the DOS prompt. From that point on,
any simultaneous pressing of the LEFT-SHIFT -- RIGHT-SHIFT keys will
automatically save the entire current state of the operating system, followed
by the execution of a newly loaded command processor. It's like having two
computers in one! To return to your primary application, type EXIT at the
DOS prompt. That is all you need to know to use this program!
Let me emphasize that this Demonstration Version of HOT-DOS has purposely
been severely limited in its capabilities. I will briefly mention the
limitations, followed by a thorough discussion of the full capability
available in the authorized version.
** SIDEKICK COMPATIBILITY **
The demonstration version of HOT-DOS is not compatible with Sidekick (tm).
To use Sidekick (tm) with HOT-DOS you must obtain the authorized version.
The authorized version has been thoroughly tested with Sidekick (tm), and
appears to function flawlessly. This combination of resident programs
creates an extremely powerful environment. Serious users of Sidekick (tm)
will wonder how they managed without a HOT-DOS capability.
** USER CONFIGURABLE PARTITION SIZE **
The demonstration version of HOT-DOS uses the minimum partition size required
to load COMMAND.COM. This will allow users to load and execute any
application program using less than approximately 20K. This size is
sufficient for most DOS commands, but will not support most applications.
The authorized version of HOT-DOS allows the user to set the size of the
partition at load time. This feature makes it possible to configure your
memory allocation to suit any particular requirements. The size of the
HOT-DOS partition can be set anywhere from 20K to the limit of RAM installed
in the user's machine.
** USER CONFIGURABLE DRIVE SPECIFICATION **
The demonstration version of HOT-DOS uses the A: drive to search for
COMMAND.COM. A copy of COMMAND.COM must be included in the root directory of
a diskette inserted in drive A: for the program to properly load and execute.
The authorized version of HOT-DOS allows the user to specify the drive to be
searched for COMMAND.COM. This feature allows COMMAND.COM to be accessed
from the root directory of any drive configured on the system. I personally
recommend accessing from a RAM disk for virtually instantaneous loading of the
HOT-DOS environment.
** AUTOMATIC DISPLAY DETERMINATION **
The demonstration version will automatically determine which display adapter
(monochrome or color/graphics) is currently being used, and will load the
HOT-DOS environment using this display. HOT-DOS has only been tested on IBM
compatible standard monochrome and IBM compatible standard color/graphics
adapters. It has not been tested on EGA or Hercules display cards. I cannot
vouch for its compatibility using either of these options.
** USE BOTH SCREENS **
The demonstration version has been designed to run on only one screen. For
users having both the IBM monochrome and IBM color/graphics or compatible
displays available, the authorized version of HOT-DOS includes a valuable
feature that automatically loads the HOT-DOS environment on the display that
is NOT currently active. This allows the user to refer to data on the
primary screen while running HOT-DOS on the other screen. The user maintains
the option of switching screens at any time in either environment. Upon EXIT,
HOT-DOS will restore the primary environment exactly as it was executing
prior to activating HOT-DOS.
** GRAPHICS SUPPORT **
The demonstration version of HOT-DOS does not support any of the graphics
modes available using the IBM color/graphics adapter. If a primary
application is running a graphics display application, the screen will not be
restored properly upon EXIT from HOT-DOS. The authorized version of HOT-DOS
will restore any graphics mode screen upon EXIT from HOT-DOS at the expense
of an additional 12K RAM required for use as a buffer.
** IMPORTANT NOTE REGARDING USE OF HOT-DOS DEMONSTRATION PROGRAM **
As is evident in the preceding documentation, the HOT-DOS Demonstration
Program has been designed to give the user a taste of the enormous capability
provided by HOT-DOS without offering the full benefits available with the
authorized version. As a further limitation in the Demonstration version,
you will be allowed only THREE opportunities to escape to the HOT-DOS
environment after any boot of the system. After three accesses, the HOT-KEY
(LEFT-SHIFT -- RIGHT-SHIFT combination) will be disabled.
The potential user of HOT-DOS is encouraged to thoroughly test the
Demonstration version to adequately determine whether it will run compatibly
on their system configuration. During the testing of HOT-DOS, I have
discovered several preventable problems and have provided the following
solutions:
1) Do not load any RESIDENT application in the HOT-DOS environment. Doing
so will surely destroy the integrity of the DOS memory allocation chain.
2) Do not load any application that will overlay without checking for the
top of memory location stored in the Program Segment Prefix. A program that
overlays above the top of available memory (in the HOT-DOS partition) will
overwrite the memory chain block of the primary application, not to mention
the PSP and part of the primary application itself!
3) Do not load BASIC in the HOT-DOS environment if BASIC is currently
suspended in the primary environment.
4) If you mistakenly type EXIT at the DOS prompt in the primary environment,
immediately run a CHKDSK on any drive configured in your system. For some
reason, running a CHKDSK avoids problems that occur if you type EXIT in the
primary environment and then immediately escape to HOT-DOS. This problem has
not been traced, but seems to be a bug in the DOS EXIT command.
To obtain immediate shipment of an authorized copy of ** HOT-DOS ** send
cashiers check or money order made payable to ROBERT BEST in the amount of
$20.00 (California residents $21.20 including 6% sales tax) to:
Robert Best
13681 Dall Lane
Santa Ana, CA 92705
Personal checks will be accepted but shipment will be delayed pending the
clearing of the check.
** HOT-DOS LICENSING AGREEMENT **
The HOT-DOS Demonstration Program is copyrighted material intended for use in
unaltered form. The user is encouraged to freely distribute the
Demonstration version of HOT-DOS provided that it has not been altered in any
way. Distribution of either an original or altered copy of the authorized
version of HOT-DOS or an altered version of the HOT-DOS Demonstration Program
is a violation of copyright. The program is provided "AS IS" without any
warranty of any kind. Should the program prove defective, the user shall
assume the entire cost of all necessary servicing, repair or correction. Site
licensing of the authorized version of HOT-DOS is available by arrangement
with Robert Best. The authorized version of HOT-DOS is intended for use on a
single machine. Making copies for use on other machines represents a
violation of this licensing agreement.