***  TSX-32 Operating System Overview  ***

The Multi-User Solution

TSX-32 is a multi-user, multi-tasking operating system.  This means that
many users can access the system at the same time, and each user can
have concurrent control over many applications.

A multi-user operating system is a little like a computer network such
as Novell or Lantastic: many users can run a variety of programs at the
same time and they can access common data files.  However, a network
requires each user to have a separate computer, and usually there has to
be a dedicated file server. In contrast, a multi-user system allows many
users to run programs and access common files on the same computer.
Each user's workstation is an inexpensive serial terminal or low-end
computer with terminal emulation software.  All of the application
computing takes place on the central system.

The multi-user approach has many advantages.  First, it is less
expensive since you do not have to buy a separate computer for each
user. Second, it is more efficient since files can be accessed directly
without having to transfer data through the network.  Third, management
and upkeep of a single computer are much easier than with a network. 
Fourth, TSX-32 supports multiple dial-in lines on the central computer
without requiring a dedicated communications server.

The TSX-32 system is actually both a multi-user and a networking system.
The basic system is inherently multi-user and is capable of running many
users on a single computer. The TSX-Net option (see below) provides
industry-standard TCP/IP network support so multiple TSX-32 systems can
be linked together via Ethernet or serial connections. TSX-32 systems
can also be interconnected with Unix/Xenix, Macintosh, Novell, and VAX
networks.

Adjustable System Size TSX-32 can be configured for a wide range of
system sizes and needs.  From single user real-time applications,
through small systems supporting a few lines, all the way up to large
systems with more than 100 terminals, TSX-32 can handle the job.  This
means that you can start out with an inexpensive limiteduser version but
expand smoothly as the need grows, and you do not even need to install
new software to increase system limits or enable optional features.
With TSX-32 you don't pay for capacity that you don't need but you have
a smooth growth path ready when you need it.


Multi-Sessions / Multi-Tasking

Do you ever start a computing task such as printing a document from a
word processor or recomputing a spreadsheet and then have to wait for
the computer?  If you do you will appreciate TSX-32's multisessions
ability which will let you proceed on with one task while another is
busy computing.

With the TSX-32 multi-sessions facility it is easy for each user to
concurrently control many applications from the same terminal.  At the
touch of a key the TSX-32 "session manager" displays a list of your
current sessions. Touch another key to select a session and your screen
is instantly updated with the appropriate display. It is just as easy to
start and terminate sessions.  Sessions that are not connected to the
terminal can execute as background tasks while you interact with other
sessions. By typing a control character, you can print the contents of
the current terminal display on any system printer.

Multiple sessions can be used immediately with any application because
no program modification is necessary.

Adaptive Scheduling Algorithm

If there is a key factor that determines how well a multi-user operating
system works it is the job scheduler, and TSX-32 has the best scheduler
there is.  The patented Adaptive Scheduling Algorithm (#4,642,756)
provides excellent system response to interactive users while handling
real-time jobs and filling idle time with low priority tasks.

Rather than using a simple "round robin" scheduling technique, TSX-32
uses an adaptive approach that takes many factors into consideration in
deciding how to allocate the CPU to the set of jobs.  For example, while
one job is waiting for some operation to complete (for example, a disk
read) the scheduler immediately switches the CPU to other tasks that are
ready to run.  When an I/O operation completes the scheduler gives the
job a brief priority boost to allow it to immediately start another
operation.

Interactive jobs are scheduled according to a flexible algorithm based
on their activity. Events which influence job scheduling include
terminal input and output, I/O completion, and duration of execution.
Real-time and batch programs can be assigned fixed priorities above or
below the normal interactive priority.

One of the most appreciated aspects of the Adaptive Scheduling Algorithm
is its ability to adjust automatically to changing system loads without
requiring intervention by a system manager.

DOS Compatibility

Although TSX-32 is designed from the ground up to be a 32-bit operating
system, it also has integral support for most 16-bit DOS applications.
This means that you are ready for the 32-bit future but can continue to
use the 16-bit applications that predominate today.  Your software
investment is protected.

TSX-32 offers two levels of DOS compatibility. In the standard mode,
users execute either native 32-bit or 16-bit DOS programs from the TSX32
enhanced command processor. In the DOS mode, users are actually using
the DOS command processor (COMMAND.COM) and utilities. Terminate and
Stay Resident (TSR) programs can be run in a DOS mode session.

TSX-32 supports nearly all of the DOS commands so you can install TSX-32
at a DOS site with virtually no retraining and without changing your
working style.  Since DOS compatibility is an integral part of TSX-32
you don't have to buy any add-on emulator product or suffer the overhead
of a layered product.

32-Bit Power

TSX-32 is not a limited, 16-bit, multi-DOS add-on; rather, it is a
complete operating system designed from day one to fully utilize modern
32-bit processors.  TSX-32 provides the industry standard DPMI
multi-megabyte memory model that will be used by advanced applications
of the future, and it does it today.

For application developers, 32-bit compilers for C, Fortran, Pascal,
Cobol, Dibol (DBL) and other major languages are available today.

File Management

The TSX-32 file system has a hierarchical directory structure that is
DOS compatible. Because of this compatibility you can run TSX part of
the time and DOS at other times on the same computer, and you do not
have to divide, partition, or reformat your disk.

In addition to supporting the standard DOS "FAT" file structure, TSX-32
constructs internal File Window Blocks which greatly increase the speed
of accessing indexed and random files.  The file window blocks hold in a
more efficient form information about where the segments for a file are
stored on disk.  Using the window blocks TSX-32 can avoid the lengthy
search of the FAT blocks required by other systems.  File information is
cached so subsequent opens of the same file can be executed without
performing any I/O.

TSX-32 does a much better job of disk space allocation than DOS. Rather
than allocating blocks in a random fashion, TSX-32 attempts to extend
files in a contiguous fashion. This results in far less disk
fragmentation and faster file access.

Disk compression schemes such as DoubleSpace and Stacker are not
supported under TSX-32.

Overlapped I/O

TSX-32 does not use the DOS BIOS, rather it has its own set of 32-bit
I/O management routines and device drivers.  This allows TSX-32 to
execute one job while another is waiting for an I/O operation to
complete.  TSX-32 also provides "no wait" I/O operations that allow a
program to initiate an I/O operation and then continue its execution
while the I/O takes place.  Asynchronous "completion routines" (also
called AST's or Signals) can be used to notify the task when the
operation completes.

TSX-32 supports multi-threaded SCSI disk operations and performs
"elevator" seek optimization as well as anticipatory read-ahead
operations.

Data and Directory Caching

TSX-32 performs extensive caching of data and directory entries to
optimize I/O to disk files. The data cache stores blocks of frequently
accessed information in memory. Disk read operations are eliminated when
the desired data or directory entries are in the cache. Using the
"automatic read ahead" technique, TSX-32 anticipates which data will be
required next by the program and reads it into the cache while the
program processes the previous data. TSX-32 offers both the "write
through" (also called "synchronous write") and "deferred write" data
caching techniques.

Disk Shadowing

The disk shadowing option for TSX-32 causes changes made to selected
files on one disk to be "shadowed" (or "mirrored") to another disk
either on the same computer or another computer connected through the
network.  Thus, the primary and shadow files always contain the same
information.  Shadowing can be enabled for entire disks, directories, or
individual files.  The shadowing option makes it easy to set up
fault-tolerant systems that can recover quickly without losing data even
if one disk or computer goes down.

TSX-Term

The optional TSX-Term terminal emulator turns any DOS PC into a color or
mono terminal. TSX-Term allows use of the entire PC keyboard, including
ALT and function keys. You can run DOS programs on the host TSX-32
system over a hard-wired or dial-up serial line. TSX-Term includes a
built-in dialing directory.  TSX-Term operates on any DOS PC (including
8088 systems) with a minimum of 512 KB memory.

Virtual CGA mode graphics is also supported over the serial link so you
can preview word processing documents or view other graphics images.

TSX-Term transfers files between the TSX-32 system and a PC and prints
documents from the host on the PC, in the background.

A version of TSX-Term that uses TCP/IP and Ethernet connections is also
available.

TSX-Net Networking Option

The optional TSX-Net networking system offers transparent access to
remote files, peripherals and programs as well as remote login (SET
HOST) among TSX-32 systems. Record locking is supported through the
network, allowing you to have shared databases accessed from any
computer on the network.

TSX-Net uses the industry-standard TCP/IP protocol which provides
peer-to-peer services so that every computer has equal standing and
there is no master computer or dedicated file server.  Any program on
any computer in the network can access any file, peripheral, or program
on any other computer in the network.

Single-user and multi-user TSX-32 systems can be configured into a LAN
using high speed Ethernet links, or a WAN over async serial lines.
Accessing shared data bases (with record locking), remote printers, and
other remote devices is as easy as adding a network "node" name to a
file specification.  For example, the following specification is for a
file on the network node named DEV: "DEV::C:\ALPHA\JUNE.DAT".

TSX-Net implements the Berkeley "Sockets" API for program-to-program
communication.

Internet Connectivity

TCP/IP Application Tool Kit The optional TCP/IP ATK allows TSX-32
systems with TSX-Net to interconnect with heterogenous systems through
the Internet. This means that TSX-32 can integrate into an
enterprise-wide network and connect with Novell, Unix, Macintosh,
VAX/VMS, and other types of systems.  TSX-32 can also operate as an NFS
file server for DOS and Windows based computers.

The Internet connectivity kit includes the Domain Name Server, FTP, Telnet and
SMTP.  You can have both incoming and outgoing Telnet and FTP connections.
TSX-32 includes a comprehensive set of file access control facilities so you can
limit which files and directories can be accessed by remote FTP users.  World
Wide Web server and client programs are available so that you can access other
Web sites and you can also create your own HTML "home pages" for remote users to
access.

Memory Management

TSX-32 uses the "protected" mode of 386 and 486 processors to give each
running application its own memory space which no other application may
access.  If an application attempts to access areas of memory that are
outside of its allowed region TSX-32 takes corrective action such as
stopping the application or invoking a debugging program.

Protected mode allows the use of 32-bit addresses.  TSX-32 supports both
the Phar Lap and DPMI "flat" and segmented memory models which do away
with the DOS 640 KB memory limit and allow direct access to enormous
memory areas.

When running 16-bit DOS programs, TSX-32 provides each application with
a consistent virtual address space of 640 Kb + EMS and XMS, no matter
how many other users or tasks are running.

Physical memory is used efficiently by the operating system with only
the active portions of running programs residing in memory. Typically,
less than 500 Kb of physical memory need be configured for each DOS user
task.

TSX-32's virtual memory with demand paging allows programs to access
large amounts of memory, potentially more than the physical memory
installed on your computer. The system automatically keeps in memory the
active parts of large programs. In order to balance the demand for
memory by multiple users, TSX-32 monitors the memory requirements of
each task and automatically and dynamically adjusts the amount of
physical memory available to each job.

For advanced applications, TSX-32 provides shared memory regions which
allow multiple programs to access a common memory area such that the
same data is available to all of the cooperating programs.  This is
especially useful for advanced real-time systems.

System Services

TSX-32 system services are provided through four application program
interfaces ("API's"). These API's are a standard part of the TSX-32
kernel, not layered emulators, thus execution is very efficient. None
reduce memory address space nor do they add system overhead. Single and
multiple users can multi-task any combination of programs using a
variety of these API's without conflict.

The 32-bit Native API offers an extensive set of system services (more
than 200) and facilitates the migration of sophisticated software to
386/486 platforms. Complete libraries of system service interface
routines are provided for C and FORTRAN programs.

The 32-bit Extended DOS API provides system services which are
compatible with the popular Phar Lap 386|DOS-Extender. This allows
TSX-32 to directly execute the high performance 32-bit applications and
compilers developed for the 386|DOS-Extender.

The 16-bit DOS API provides system services which are compatible with
DOS and the BIOS. This allows TSX-32 to directly execute DOS
applications and languages without conversion or adaptation. In
addition, a library of system service interface routines is provided so
16bit C programs can use the full set of "native" 32-bit TSX-32
services.

The DOS Protected Mode Interface, DPMI API, provides the services needed
by 16- and 32-bit DOS programs that wish to run in protected mode.   The
TSX-32 DPMI API includes the extensions for DOS system services provided
by the Microsoft Windows DPMI.

Real-time Services TSX-32 is capable of running multiple real-time tasks
at the same time as time-sharing and batch operations. TSX-32 provides
system services to allow real-time programs to connect to external
interrupts, access I/O control ports, share data through global memory
regions, and perform clock-driven operations. To facilitate the
development of programs that require event-driven operation,
asynchronous "completion routines" (AST's) are provided for many system
services. For time-critical applications, real-time programs can execute
at priorities that take precedence over normal time-sharing jobs.

System Security

TSX-32 includes many security features normally found only on mainframe
and super-mini computer systems.  The security system is very flexible
and may be disabled entirely or enabled on a feature-by-feature basis.

The LOGON program requires entry of a valid user name and password and
then sets user specific privileges and priorities.  Each account may be
granted any combination of the 31 job privileges. In addition, limits
can be set for the maximum authorized job priority and the maximum
memory space that may be used.  Expiration limits can be set for
accounts.

Access to the system for each account can be limited to hardwired,
dial-in, network, or batch modes. Thus, dial-in access to highly
privileged accounts can be restricted even if the proper password is
known by the accessor.  Logon access control can be enabled on a
line-by-line basis.

An optional "system password" can be used to require entry of an
additional password before any system identification is displayed.  This
is useful to avoid revealing information about a system to hackers who
may be performing random calling.

The system manager may "install" programs so that privileges are
temporarily granted or denied while the program is running.  Programs
also can be "locked" to an account so that the user may execute no other
program.

A flexible file access control system can be used to limit the type of
access that each user may have to files on a file-by-file, directory, or
disk basis.  For each disk, directory, or file, individual users or
groups of users may be granted full access, read-only access, or
execute-only access.

An event log may be enabled to audit attempted security violations. The
security log will keep track of all failed logon attempts and attempts
to access files for which the user was not authorized.

An additional file event log can be activated to silently record all
accesses to selected files.

Task Isolation

TSX-32 executes each task using the "protected mode" of the processor
which provides hardware control over the areas of memory that the
program can access and restricts some privileged instructions.  This
protects the operating system and other users from inadvertent or
intentional harm by another program and greatly reduces the occurrences
of system "hangs" or "crashes."

Dial-in Line Support

TSX-32 supports both hardwired and dial-in terminal connections.  Based
on system security settings, dial-in lines potentially have full access
to all of the commands and programs available to local, hardwired users.
This means that you can dial in from home and run your favorite word
processor or spread sheet.  It also greatly facilitates support of
remote sites.  And dial-in support is a standard, integrated part of
TSX-32 so you do not need to buy any third-party products.

With its dial-in support, TSX-32 is a little like a multi-node bulletin
board except that with TSX-32 each user can run any set of commands and
programs rather than being limited to a specific set of programs (or
"doors") that are controlled by the bulletin board.

Any of the COM or serial multiplexer ports can be connected to modems
making it possible to construct TSX-32 systems with hundreds of dial-in
lines.  In a networked system, you can dial in and log onto any system
on the network.

Batch Jobs

Users can submit jobs to a batch queue which holds the request until a
specified time or until previously submitted batch jobs complete. The
batch system features multiple queues, priorities, scheduling times, log
files, and requeueing.

Do you have an application you want to run at midnight?  No problem,
just submit it as a batch job using the "/AFTER=TOMORROW" qualifier to
specify when it should start executing.

Command Files

TSX-32 command files are similar to DOS batch files, but much more
powerful.  TSX-32 command file execution can be controlled by a
programming language complete with expressions including strings,
numbers, symbols, arithmetic operators, string operators, relational
operators, and lexical functions. This makes it easy to write
"intelligent" command procedures that carry out routine operations.
Command procedures can be executed either interactively or as batch
jobs.

Process Control

TSX-32 provides several ways that one process can initiate, control, and
communicate with other processes. For example, one program can start a
"detached" process, that is not connected to any terminal, to perform
some computing.  It can communicate with other processes by use of
"mailboxes," signals and other mechanisms.  In addition, the "fork"
service allows one process to initiate concurrent, parallel processing
of another copy of its program image.

Debugger

A debugger is built into TSX-32 and is instantly available by typing one
control character. It does not have to be linked with programs. Debugger
facilities include: instruction breakpoints, data watchpoints, single
step and "unassemble" commands, data examination and modification, and
use of global program symbols.

EDIT-32 Editor

EDIT-32 is a powerful screen-oriented text editor which offers "Gold
Key" style editing commands familiar to users of EDT, KED and EVE. DOS
users may define EDIT-32's function keys to perform many familiar
DOS-style operations. EDIT-32's advanced features include multi-file
editing with windowing, a powerful command language with numeric
manipulation and conditional execution, "Teach" capability, and regular
expression pattern searching. EDIT-32 is also available under PC/MS-DOS
and VAX/VMS.

Error Logging

The error logging facility records unexpected events such as device
errors and produces error log reports. Application programs may also
generate error log entries.

General Facility Locking

Cooperating programs may define facilities which are single named
entities or hierarchically grouped sets of entities. Programs can
synchronize their execution by locking facilities.

Inter-Program Communication

A "mailbox" is a software facility which transfers data between running
programs. Mailboxes can be created with storage space to hold messages
to be picked up later by another program. Mailboxes can also be used as
"pipes" to transfer data directly between running programs.

NetBIOS Support

TSX supports the standard NetBIOS system services for communication
between programs.  This makes it easy to port network based applications
to the TSX multi-user environment.  The NetBIOS support is for
communication between programs on the same computer; see the description
of the TSX-Net option for information about network communication
between computers.

Mail System

MessageNet is a comprehensive e-mail system for TSX-32 which allows
users to send messages to each other. MessageNet, which is a standard
part of TSX-32, features convenient browse screens, "folders" for
storing messages, distribution lists, reminder messages, and forwarding
and reply functions. The Advanced MessageNet option allows users to send
messages and files through dial-in lines to other TSX-32 sites, and to
send telex, FAX and other forms of E-mail messages through AT&T Easylink
and MCI Mail.

Printer Spooling & Queueing

TSX-32 provides a comprehensive spooling system for managing even the
most demanding configuration with many spooled devices. Spooler requests
can be assigned priorities and scheduled for processing at later times.
A print request may specify an associated "form" which determines
printer stock, page margins and associated setup and reset files which
are printed automatically whenever the job starts and finishes. Flag and
trailer pages with block letters identifying the user, job, and file
name may be selected. Simple commands allow you to move a single job or
all jobs from one queue to another, or change the priority, scheduling
parameters, and form names.

A full screen queue management program makes it easy to monitor and
control your spooling system.  It provides a dynamic display of the jobs
in print and batch queues and gives you options for defining forms,
deleting and requeueing jobs, and creating print and batch queues.

Spooled printers may attached via parallel or serial lines and may share
a serial line with terminals with auxiliary printer ports (refer to
"Terminal Printers").

Shared File Record Locking

TSX-32 coordinates file access so that multiple users can read and write
the same or different files concurrently.  This makes TSX-32 a natural
and efficient system for applications such as pharmacies, video stores,
and other situations where multiple terminals are used to access a
common database.

File open control allows an application to specify whether the file is
being opened for read-only or read-write access.  The application can
specify whether other applications can access the file in read-only or
read-write mode.

Record locking allows you to reserve a range of bytes within a file for
exclusive access. The locking service blocks other readers, writers, or
both. Programs may test for locked records, wait for locked records, or
queue completion routines to be executed when a record becomes
available.  Both native 32-bit and DOS-compatible 16-bit record locking
services are provided.

If the "tentative file" facility is engaged, TSX-32 will create
tentative files with temporary names that do not replace existing files
until the tentative file is closed and all users accessing the permanent
file close the file.

Shared Program Images

When two or more users are executing the same 32-bit program, TSX-32
keeps in physical memory only one copy of the program which is shared by
all users. This saves a significant amount of physical memory when many
users are executing the same program.

System Generation

TSX-32's system generation program builds information tables that are
used during bootstrap. System generation does not require any reassembly
or relinking and can usually be accomplished in a matter of seconds.

System Monitor Facility

The SYSMON program displays dynamic information about system usage,
executing jobs, and data caching.

Terminal Support

TSX-32 supports connections from a wide variety of terminal types
including multi-console adapters, serial ANSI and PC-Term terminals, and
computers running terminal emulator programs.

TSX-32 supports several "multi-console" adapters which make it possible
to connect multiple MDA or VGA monitors and keyboards to the same
computer.  Using these adapters it is possible to have many users
running graphical display applications at the same time.  It is also
possible to have multiple mouse connections.

PC-Term type terminals such as the Wyse and Relisys are a popular choice
for serial line connections because they provide a PC compatible
keyboard, 25 line display, and local printers.

Another way to connect to TSX-32 is by using a terminal emulator program
such as TSX-Term (see separate description) to turn an inexpensive PC
into a terminal. This approach allows you to make productive use of
older computers (including 8088 systems) that you may have considered
obsolete.

ANSI terminals such as DEC VT-100, 220, 320, 420 and compatible
terminals can be used to run DOS programs on TSX-32 because TSX provides
function key mapping and also does screen shifting to allow 25 line
application screens to be displayed on 24 line terminals.

Serial terminals can be connected through COM ports and several brands
of serial multiplexers that support literally hundreds of communication
ports.

Terminal Printers

Printers attached to the auxiliary printer ports of supported serial
terminals may be used system wide, that is by all users on the local
system and the TSX-Net network. The terminal may be used without
interruption while the printer is active.  Terminal printers are also
supported on TSX-Term workstations.

Terminal Input Editor

The TSX-32 Terminal Input Editor allows you to recall, edit and
reexecute previously entered command lines.

Terminal Logging

When a user enables terminal logging, all input received from the
controlling terminal or a command file, and all output written to the
terminal, is copied to a log file.

TUTOR Facility

Application developers and VAR's will be pleased by the remote support
and diagnosis capabilities of the TUTOR command.  TUTOR allows a user to
"copilot" another terminal. This synchronizes the two screens and
keyboards so that you can see what the other user is typing and enter
commands at the same time. This makes it easy to guide customers through
an application or bail users out of tight spots.  Any time sharing-line
can tutor any other line (if authorized by the system manager).  You can
even dial into a remote system and tutor the console or any other
terminal.  Multiple tutor connections can be established to allow you to
conduct a class with all student screens synchronized to the teacher.

Online HELP

TSX-32 includes an on-line, screen-oriented HELP facility that explains
each system command and option. In addition, most of the TSX-32 utility
programs include an integrated, context-sensitive help facility that can
be invoked by pressing one key.

Usage Accounting

If enabled, an entry is made in the system accounting file for each job
session recording statistics such as CPU time, connect time, page
faults, and I/O operations.

User Defined Commands and Keys

You can easily define commands to run programs, invoke command files or
perform other functions. Because user commands are checked before system
commands, you can define a command to perform a different operation than
the standard system command. Users can define local or system-wide
symbols and logical device name assignments.

The MACRO and DEFINE KEY commands allows you to designate a terminal key
to execute a system command or command file. At the touch of a key you
can run programs or carry out complex operations. Keys can also be
redefined to support foreign language or other alternate keyboards.

Extended Wildcard Operations TSX-32 extends the "wildcard" file matching
operation to include searches through directory trees. For example, the
following command lists a directory of all files on the C disk in the
PHIL directory and all directories under it: "DIR C:\PHIL\...\*.*".
Because this feature is built into the operating system, it works with
all TSX-32 utilities such as directory, file searching, file deletion,
copying, backup, etc.

TSX-32 Utilities

TSX-32 comes with a complete suite of utility programs for managing the
system and performing operations such as backing up files, sorting,
comparing files, searching for strings in files, dumping binary files,
and monitoring job and system activities.  Many of these programs
provide convenient, full-screen "point and shoot" type operations that
are sure to boost your productivity.

TSX-32 provides the traditional DIR command, but it also provides the
more convenient FMAN program that gives a full screen display of files.
By selecting files and pressing a few action keys you can copy, delete,
rename, edit and perform other file management operations.

TSX-32 simplifies the backup and recovery of important data and program
files. The TSX-32 BACKUP and RESTORE programs provide extensive options
for selecting files by device, directory, name, and date/time. Backup
save sets contain internal CRC checksums and redundancy blocks to allow
the full recovery of data even if some portions of the save set are
damaged or unreadable.

The TSX-32 SEARCH command searches for strings of characters, or general
string expressions, in groups of files.  SEARCH is extremely fast and
can search through selected directory trees or all files on a disk.

TSX-32 SORT is capable of efficiently sorting enormous disk files. 
Comparable in speed and capacity to mainframe sort programs, TSX-32 SORT
can handle files as large as your available disk space and allows
specification to multiple keys of both binary and text string types.
SORT also includes full logical expressions for selecting records to be
included in the sort so it can be used to extract data from a database
as well as sorting it.

System Reliability Features

TSX-32 is designed to be a rock solid system that requires minimal
system management or intervention. However, should you encounter a
system problem we have built extensive diagnostic facilities into TSX-32
that allow us to rapidly diagnose and correct problems.

Event and error logs record warning information about problems that may
be developing.  The TSX-32 "crash facility will take a "snapshot" of the
TSX-32 kernel and data areas.  This information can be written to
diskettes for later in-depth analysis.

A PATCH facility is provided with TSX-32 to allow corrections to be
applied to the kernel or utility programs.

A "spy" facility allows the system manager to monitor and log characters
transmitted and received on any line.  It also dynamically displays the
status of modem control signals. This provides a "data scope" that is
extremely useful for diagnosing serial line communication problems.

TSX-32 for Today and Tomorrow

With its DOS compatibility and 16-bit program support, TSX-32 is a
system you can install today and use immediately without retraining or
even reformatting your disk.  But, at the same time, it provides the
power and growth path that you will need in the future.  With full
32-bit program support, DPMI, virtual memory, disk shadowing, and TCP/IP
networking, TSX-32 is a system that you will not outgrow.  And TSX-32 is
not just a promise for tomorrow, it is a real system, in use at
thousands of sites, that you can install and run today.

Hardware/Software Required

TSX-32 will operate on any IBM PC compatible computer with an ISA, EISA
or MCA bus, an Intel i386, i486, Pentium or compatible processor, and
4Mb of memory. A hard disk of at least 40Mb capacity is recommended.
ST-506, MFM, RLL, ESDI, IDE, and selected SCSI interfaces and compatible
peripherals are supported. SCSI CD ROM's and backup tapes are also
supported. Serial communications are supported through standard COM
ports and popular serial multiplexers.  TSX-32 does not support disk
compression schemes such as DoubleSpace and Stacker.

TSX-Lite Shareware Demonstration System

If you would like to give the TSX-32 operating system a try, you can
download the TSX-Lite shareware, demonstration version.  TSX-Lite is
restricted to running a maximum of 2 simultaneous users and it has no
networking capability, but it does provide the TSX commands,
multi-sessions, batch jobs, printer queues, etc.

TSX-Lite can be downloaded from the S&H Computer Systems support BBS
which can be accessed via either dial-in or Internet connections. The
BBS phone number is 615-320-1820.  If you have access to the Internet,
you can use FTP to access the site with a logon name of "anonymous"; use
your e-mail address as the password.  The Internet site name is
"sandh.com".  The TSX-Lite files are named TSXnnnA.ZIP, TSXnnnB.ZIP,
TSXnnnC.ZIP, and TSXnnnD.zip, where 'nnn' is the current version number.
These files are stored in the /TSXLITE directory.

TSX-BBS Multi-line Bulletin Board System

In addition to the TSX-32 operating system, S&H Computer Systems also
produces a multi-line bulletin board system called TSX-BBS.  TSX-BBS is
a very full-featured system that offers all of the normal BBS functions
(file libraries, discussion forums, chat, e-mail, etc.) and also has an
option for full Internet connectivity.

You can download the reference manual for TSX-BBS and a shareware
demonstration version from the S&H support BBS.  The demonstration
version requires TSX-Lite.  The demonstration version of TSX-BBS is
stored in a file named TSXBBSnn.ZIP where 'nn' is te version number;
the file is in the /TSXLITE directory.

Additional Information

For assistance in ordering a demonstration or production system, or for
further technical information, contact the S&H sales department.

S&H Computer Systems, Inc.
1027 17th Avenue South
Nashville, TN  37212  USA
Voice: 615-327-3670
BBS: 615-320-1820
FAX: 615-321-5929
Internet: sales@sandh.com
Telnet & FTP: sandh.com
CompuServe: 71333,27

S&H Computer Systems is a registered trademark, and the S&H logo,
TSX-32, TSX-Net, TSX-Term, Edit-32, MessageNet & Advanced MessageNet,
are trademarks of S&H Computer Systems, Inc. Other product names are
trademarks of their respective owners.

S&H Computer Systems, Inc. makes no contractual obligation regarding
this product, either expressed or implied, and reserves the right to
modify this product and add or remove features.

Copyright 1995
S&H Computer Systems, Inc.
Nashville, TN, USA
ALL RIGHTS RESERVED