Category : System Diagnostics for your computer
Archive   : PARA14.ZIP
Filename : PARASPD.DOC

Parallel Port Performance Tester ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ User's Manual










ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
º º
º ParaSpd.Exe Parallel Technologies, Inc. º
º Parallel Port Information Utility 10603 170th Ct NE º
º (C) Copyright 1993-1994 Jay Lowe Redmond, WA 98052 º
º º
º This program may be used Lab 206-869-1136 º
º free of charge subject to the Fax 206-869-1133 º
º Restricted License Agreement Compuserve 76640,203 º
º as stated below Internet [email protected] º
º - or - [email protected] º
º º
ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ


Version 1.00
25 December 1993

Parallel Port Performance Tester ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ User's Manual




---------------------------------------------------
Welcome to the Parallel Port Performance Tester
---------------------------------------------------


ParaSpd is a small utility which may be used to test the relative
performance of different types of parallel ports on a given system.

How does it do this?

Paraspd contains typical examples of IO code as commonly used in
parallel port peripherals such as network adapters, disks, tape
drives, and so forth. Examples of 4BIT, 8BIT, and EPP/ECP IO code are
included, which allows you to compare the performance of different
types of parallel ports.

ParaSpd times the execution of the benchmark code samples as
displays the results on one of three forms: Raw Data, Chart, Table.

ParaSpd includes a database of it's results when run on various other
computers, which again allows you to compare your system and ports to
results attainable in other configurations.

ParaSpd is a companion to Parallel, the Parallel Port Information System
and many of the terms used in this document are described more completely
in Parallel.Doc.

Note that ParaSpd does not identify your parallel ports... it simply
reports the relative speeds of different types of ports that might be
used on your PC. For example, ParaSpd produces EPP/ECP results even
if you don't have an enhanced port.

So use Parallel to determine your PC's parallel port capabilities and
configuration. This will help you understand and apply ParaSpd's results.

If you like, you can send us your system's ParaSpd benchmark results for
inclusion in the ParaSpd database. Just capture ParaSpd's output to a
file and Email it to us via Compuserve or Internet at the above addresses.



















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---------------------------------------------------
Program Operation
---------------------------------------------------

To run ParaSpd, first disconnect any parallel port peripherals.

ParaSpd only does input operations and only to the specified port, but
it is nevertheless best to disconnect any devices you may have
attached to the parallel port being tested. ParaSpd should cause no
system side effects when used with it's standard parameters, but it
can hang your system if you use it to test ports other than LPT ports.
There is a warning dialog which tells you when this might happen.

Then type ParaSpd at the command line, followed by two parameters:

C:\> ParaSpd 378 Chart
  Format for Results
³ ³ Raw ... The raw measurements
³ ÀÄÄÄÄÄÄÄÄÄ Chart ... Vertical Bar Chart
³ Table ... Tabular Comparison
³
³ Parallel Port to be Tested
³ 3BC
ÀÄÄÄÄÄÄÄÄÄÄÄÄ 378
278
other addresses may be tested after a
warning message is confirmed. For example
address 37C is the EPP data port.

C:\> ParaSpd By itself produces a help display

C:\> ParaSpd ? Produces more help

Just as you'd expect, the ParaSpd results are extremely sensitive
to variations in bus timings, since the IO instruction times are the
major factor in transfer rate on most systems. Some PC buses have user
selectable timings ... these yield some interesting results with ParaSpd.

In general, ISA bus PC's will have a maximum of about 1000 Kbytes/sec
I/O speed for programmed I/O. EISA, MC, VLB, and PCI buses have
considerably better performance, but that may not translate into
ParaSpd results.
















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---------------------------------------------------
Interpreting ParaSpd's Results
---------------------------------------------------

ParaSpd displays four benchmark results: 4BIT, 8BIT, EPP/ECP, and Total.
The values are in Kilobytes per Second (KBytes/Sec or KBps).

4BIT -- IO speed when performing 4BIT input operations

8BIT -- IO speed when performing 8BIT input or output

EPP/ECP -- IO speed when performing EPP input or output
also applies to programmed I/O using ECP ports

Total -- simply, the sum of 4BIT, 8BIT, and EPP/ECP.

The Table display is sorted in order of descending Total transfer rate,
an entirely arbitrary approach.

ParaSpd's benchmarks reflect the IO programming practices commonly used
in existing commerical parallel port peripherals. ParaSpd does not always
test the MAXIMUM transfer rate of the parallel port - rather it tests the
MAXIMUM EFFECTIVE transfer rate that data can travel from a program in
the PC to an external peripheral. For technical junkies, this means that
the test is not just an IO bandwidth test, but a mix of input accesses
and memory references.

So, because ParaSpd is reporting effective transfer rates, it's results
are more useful for predicting the potential performance of peripherals.

Most actual parallel peripherals will have lower transfer rates than the
ParaSpd benchmark, because:

(1) not all parallel peripherals use optimal IO methods

(2) the performance of these devices is often affected by other
system factors (network performance, disk latency, etc).

However, since the operation of most parallel peripherals is "IO bound",
it is often possible to predict the performance of device X on System A
by measuring it's performance on System B and applying the ratio of the
ParaSpd benchmarks on the two systems:


ParaSpd Result System A
Device X on System A = ----------------------- * Device X on System B
ParaSpd Result System B


Remember to compare Apples to Apples (or rather PCs to PCs in this case).
Don't use the fairly arbitrary "Total" performance number, but rather use
the result for the appropriate port type on each system. Also remember
that as the IO performance improves - on faster port types or faster
systems - the device becomes less IO bound and you may begin to see
diminishing returns as other factors begin to dominate the performance
equation.


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Let's try an example:

Suppose: System B has a 4BIT port
and gets a ParaSpd rating of 60 Kbytes/Sec

System A has an 8BIT port
and gets a ParaSpd rating of 200 Kbytes/Sec

Device X (let's suppose a disk)
and actually runs at 40 Kbytes/Sec on System B

Then, on System A you might expect

200
Device X on System A = --- = 3.33 * 40 = 133 Kbytes/Sec
60

Or, if System A had an EPP port
and gets a ParaSpd rating of 900 Kbytes/Sec

Then,

900
Device X on System A = --- = 15.0 * 40 = 600 Kbytes/Sec
60

Clearly, then, the performance of parallel port peripherals is greatly
affected by the port type, and to a lesser degree by bus and CPU
performance, up to a limit which is specific to the particular device.
The relationship between transfer speed and effective performance is
not linear, but it may roughly correspond to a linear relationship in
the range of lower transfer rates.

With the 4BIT and 8BIT port types, bus performance is the major
determining factor of overall performance, followed by the CPU speed.

With EPP and ECP ports, the system's bus speed and memory architecture
is more important than the CPU speed in determing IO performance. Many
older systems with slower CPUs can still run faster than many modern
PCs that have slower buses.

Another interesting factor is that 286 systems are great at parallel
port IO in 4BIT and 8BIT modes, because the 286 has a much more efficent
IO design than it's more complicated successors.

Not all parallel peripherals support all the port types - in fact only
a few peripherals do support EPP or ECP type ports, although the number is
increasing.










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---------------------------------------------------
Other Factors Affecting Parallel Port Performance
---------------------------------------------------


Several other factors also affect the effective performance of external
peripherals operating through the parallel port. These include:

Port Performance
----------------

Signal delays Many older ports in the 4BIT, 8BIT, and semi-8BIT
catagories have noise suppression circuitry which
imposes quite significant delays in excess of
typical design expectations.

Laptops, in particular, may have quite excessive
signal timings.

Bugs and Quirks Some parallel ports have rather peculiar logical
bugs in the behavior of their status and control
registers which require special case handling.
These ports may not work well, or at all, with
simple-minded device drivers.

Bus delays Some PCs implement extra wait states for I/O accesses.
These delays can be adjusted on some PCs by use
of the CMOS setup menus. Be especially careful
when attempting such adjustments, you may paint
yourself into a corner ... write down the original
values of any settings you change.

Also consider that changes to I/O access delays
will affect other devices in your system, such
as video cards, older memory cards, network cards,
and so forth.

Peripheral Device Performance
-----------------------------

While we do not intent to attempt a tutorial on external parallel port
peripherals design, there are a few factors worth mentioning that
dramatically affect the performance of such peripherals.

Pullups Correct design of pullups is critical to ensuring
quick, crisp signal timings. This factor also affects
the cable length/quality tolerance of the device.

Handshaking method Since there is no standard method for handshaking
in 4BIT and 8BIT modes, parallel peripherals that use
different handshaking methods can show vastly
different performance behaviors.

IO mode support Some peripherals only support a limited selection
of parallel ports. For example, many low-end devices
or intentionally unspeedy devices only support 4BIT
mode. PTI-developed peripherals support a wide

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selection of I/O techniques designed to get maximum
speed on a wide range of ports.

These factors, and others, are critical in designing (any buying!) high-
performance devices. Our firm is often retained to make performance
improvements to existing devices ... careful handling of these issues
often allows us to improve performance of existing devices by 200% - 400%!



















































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---------------------------------------------------
Using ParaSpd's Results
---------------------------------------------------

Here are a few guidelines for getting the most from your external
peripherals:

1) Use the fastest port type possible on your system. EPP/ECP ports are
best, followed by 8BIT ports, with 4BIT ports bringing up the rear.

If you have a desktop system with only 4BIT capability, consider
adding an additional 8BIT or EPP parallel port. However, you
may want to wait a bit for ECP ports to enter the market... and
wait awhile longer for them to drift down in price!

If you have a laptop, you may be able to configure your parallel
port from 4BIT to 8BIT and even to EPP. If you use parallel port
peripherals, it's worth the time to become familiar with your
CMOS (or other) setup options. You might have more "port" onhand
than you've been using!

[ refer to Parallel.Doc for more information on port configuration ]

2) When buying any computer, check the parallel port type, preferably
by using the Parallel.Exe -- the Parallel Port Information Utility.
Vendor's parallel port specifications are simply not 100% reliable.

There is a certain amount of "slack" in the commonly used terms
"unidirectional" and "bidirectional" and "enhanced" ports. It is
a common practice for some vendors to imroperly identify their
4BIT ports as "bidirectional" or to call 8BIT ports "Enhanced".

This is why we use the terms 4BIT, 8BIT, semi-8BIT, EPP, and ECP -
to avoid ambiguity about the actual capabilities of the port.

So ... make sure you know what's REALLY inside.

3) When buying a laptop computer, you should seriously consider
selecting one with an high-speed parallel port (EPP or ECP).
Expansion is a constant challenge for portable systems, and even
with the advent of PCMCIA, the parallel port is still an excellent
alternative for system expansion... so keep your options open.

4) When buying a parallel port peripheral, select one that has EPP
capability. Peripherals which are EPP-capable can be 2 to 10 times
faster than other devices, depending on the type of peripheral.

5) Some vendors have special utilities that are required to change
the parallel port type. You may want to check with your vendor,
or peruse their bulletin boards or other electronic forums, since
these utilities are usually made available in this way.

6) Don't expect your vendor to understand parallel ports. They are
currently a very low priority with many vendors. Some vendors
have relatively well-informed tech support people who "know
their ports" ... but don't take no for an answer automatically.


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-------------------------------------------------------------------------
Parallel Technologies, Inc. Products and Services
-------------------------------------------------------------------------

We at Parallel Technologies' have been creating innovative parallel
port devices and software since 1989. Here are a few highlights:

o 1st ... network adapter for the parallel port
o 1st ... built-in passthrough printing port
o 1st ... automatic self-configuring drivers
o 1st ... universal support for all parallel ports
o 1st ... network adapters with multiple media support
o 1st ... Windows 3.1 multimedia driver for parallel adapter
o 1st ... Multiple Parallel Device API for shared devices
o 1st ... intelligent parasitic power for self-powered devices
o 1st ... daisychained parallel port peripherals
o 1st ... multiplexed parallel port peripherals
o 1st ... Parallel Port Expansion System
o 1st ... product development tools for OEMs and developers

o PC MAG Editor's Choice for Ethernet parallel port NIC
o most total network adapters -- 6 and counting...
o most total parallel port peripherals -- 17 and counting...

We have in-depth experience with the wonderful and sometimes bizarre
world of the PC parallel port and have served on both the EPP and
IEEE 1284 standards committees. Having created more than a dozen
parallel port devices with their associated drivers and software
utilities, we are the most experienced source for off-the-shelf
technology, developer tools and components, and contract services.

Here are a few of our current and forthcoming products that you may
find interesting.

Parallel Port Developer's Kits
-----------------------------

Pipx was constructed with Parallel Technologies' advanced parallel
port software, which has been used in over 15 parallel port devices
including network adapters, parallel port disks, parallel port
wireless IR adapters, parallel port MIDI interfaces, and so forth.

This software includes support for all types of ports, IO code
that is extremely resistant to port idiosyncrasies, and full
autodetection of all port hardware features. The code is very well
documented. A selection of sample drivers for parallel port devices
is also available.

Kit Versions
------------

Device Level One Kit

Hardware schematics, timing diagrams, access methods and
all other hardware information required to implement basic
peripheral devices that are compatible with all types of
parallel ports (4BIT, 8BIT, semi-8BIT, EPP, ECP).

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Software section includes sample source code for register
and block data access to the sample device.

Device Level Two Kit

Includes Level One Kit PLUS ... details on very-high speed
IO techniques, designing passthrough ports, daisychain and
multiplexor compatible Multiport devices. Also includes
full EPP and IEEE 1284 specifications.

IEEE "Super 1284" Printer Kit

Prototyping board, FPGA equations, assembler source for
1284 negotiation, Windows 3.1 driver source.

Allows the rapid development of IEEE 1284 compatible printers.

Also ... Super 1284 goes BEYOND the IEEE 1284 spec to allow
full transparent bi-directional I/O on 4BIT, semi-8BIT, and
8BIT ports. This means that Super 1284 printers can operate
bi-directionally at very high speeds (upwards of 250Kbyte/sec)
even on the installed base of "old-fashioned" ports.

Super 1284 maintains complete compatibility with IEEE 1284
ports and printers ... it is a compatible enhancement that
allows printer vendors to support high-speed operation
independently of EPP and ECP port availability.

Connectivity Kit

Includes hardware schematics for 4BIT (laplink compatible),
8BIT, ECP, and the Universal Parallel Port Cable.

Includes driver source code for parallel port network drivers.

This kit allows connectivity vendors to support very fast
parallel port connections (500 Kbytes/sec on the ECP and
Universal Cable) and to develop compatible products for the
new ParaNet standard.


Parallel -- the Parallel Port Information Utility
-------------------------------------------------

A handy utility which examines your system's parallel ports and
reports the Port Type, IO address, IRQ level, BIOS name, and an
assortment of informative notes and warnings in a compact and easy
to read display. The output may be redirected to a file for tech
support purposes. Parallel uses very sophisticated techniques for
port and IRQ detection and is aware of a broad range of quirky port
features.

Parallel is the definitive parallel port Tech Support tool.

Parallel is Freeware, subject to a restricted license agreement.
It may be used free of charge for any personal, non-commercial

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purpose. Vendors should contact us regarding commercial licenses.

A forthcoming commercial version of Parallel will use an active
loopback connector enabling many new features including detailed
resolution of port IO behavior and effective throughput testing.


Parallel Port Networking
------------------------

Now you can network two PCs using your favorite network software
with just a parallel port cable between the systems.

Supports: Netware Lite, Workgroups for Windows, MS Lan Manager,
various TCP/IP systems, and other network operating systems that
use the ODI, NDIS, or packet driver interfaces.

Performance is better than you might expect, ranging from a low
end of 40 KBps between 4BIT ports all the way up to an effective
200 KBps between EPP ports using our TURBO cable. This upper range
is better than many ethernet ISA cards.

The drivers are available with or without cables, and existing cable
types typically used with laplink type products are also supported.


The MultiPort Parallel Port Expansion System
--------------------------------------------

The MultiPort 4-port multiplexor turns your parallel port into
a general purpose expansion system, capable of supporting up to
four simultaneously operating parallel port peripherals including
network adapters, portable hard drives, tape backup units, CDROMs,
floppies, and so forth. For example, you can use the MultiPort Mux
to attach a network adapter, a hard disk, a CD-ROM, and a printer,
all operating together through a single parallel port.

Now your laptop (and desktop) can enjoy a full range of peripherals
with all the portability, sharability, and convenience of parallel
port devices.

OEM Products
------------

Most of our products are available for OEM licensing, including
network adapters, EPP-capable hard disks, parallel-SCSI interface,
parallel MIDI adapter, and the MultiPort parallel port expander.

Also available are numerous off-the-shelf hardware and software
components including: device schematics, FPGA equations, DOS and
Windows driver source code, etc, etc.


Development Services
--------------------

We specialize in contract development of parallel port peripherals

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and associated software including DOS and Windows device drivers.
Our broad and deep experience with parallel port devices and our
commitment to specialization allows us to design, implement, test,
and support them very efficiently.

You might be interested in our 30/90 development offer. We propose
to convert any ISA peripheral into a parallel port device in only
30 days to prototype, 90 days to production.

We also offer more limited development support, such as developing
additional devices drivers for existing peripherals.

We are quite experienced with EPP ports and are ready to upgrade
your existing parallel port devices to full EPP performance.


Consulting and Training
-----------------------

In support of in-house development, you will find our consulting
and training services invaluable in avoiding the pitfalls of
parallel port development while achieving the highest possible
product performance and quality.



































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------------------------------
Software License Agreement
------------------------------

IMPORTANT

Read this agreement before installing or using the Software. Installing
and/or using the Software on your computer indicates your acceptance of
these terms. If you do not agree to these terms and conditions, delete the
Software and all it's associated files from your computer. This Software
License Agreement gives you ONLY RESTRICTED RIGHTS to use the Software (and
all it's associated files and documentation) as follows:

YOU MAY

1. Use the Software without charge on as many systems as you wish,

2. Share the Software with others for their personal use, but only
if you share it intact, without any changes or modifications of
any kind, and complete with all it's documentation and associated
files. You must pass it on exactly in the same form as we release
it, or not pass it on at all,

3. Make backup copies of the Software, so long as you place our
copyright notice on the backup copies,

4. Request and receive technical support as provided in the
particular product's Product Support Policy.

5. Vendors may distribute the Software free of charge by electronic
or other means for the purpose of technical support, but may not
include the Software in their products without our written permission.

YOU MAY NOT

1. Use the Software in any way except as provided in this agreement,

2. Modify, alter, copy, transfer, or reproduce the Software in any
way, except as expressly allowed in this agreement,

3. Translate, de-assemble, de-compile, reverse program, or reverse
engineer the Software or any of its components,

4. Charge any kind of fee for distributing the Software without our
written permission,

5. Use the Software for commercial purposes without our permission,

6. Sublicense, lease, rent, sell, distribute, or otherwise dispose
of the Software without our written permission.

This license is effective from the date of first use of the Software and
shall remain in force until terminated. You may terminate this agreement by
destroying any and all copies of the Software and its documentation.
Parallel Technologies, Inc. may terminate this agreement if you fail to
comply with any of the terms and conditions of it. You agree to destroy any
and all copies of the Software and its documentation, in whatever form, if

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we terminate this license agreement, and you agree to provide us written
certification of such destruction upon our request.

Statement of Exclusion of Warranty

ALL PRODUCTS DELIVERED PURSUANT TO THIS AGREEMENT ARE DELIVERED ON AN
"AS-IS" BASIS AND PARALLEL TECHNOLOGIES, ITS DEALERS AND DISTRIBUTORS,
EXPRESSLY DISCLAIM ANY AND ALL WARRANTIES OR CONDITIONS OF MERCHANTABLE
QUALITY OR FITNESS FOR A PARTICULAR PURPOSE.

Limitation of Liability

PARALLEL TECHNOLOGIES DISCLAIMS ALL WARRANTIES RELATING TO THIS SOFTWARE,
WHETHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND ALL
SUCH WARRANTIES ARE EXPRESSLY AND SPECIFICALLY DISCLAIMED. NEITHER
PARALLEL TECHNOLOGIES NOR ANYONE ELSE WHO HAS BEEN INVOLVED IN THE
CREATION, PRODUCTION, OR DELIVERY OF THIS SOFTWARE SHALL BE LIABLE FOR ANY
INDIRECT, CONSEQUENTIAL, SPECIAL, PUNITIVE, OR INCIDENTAL DAMAGES OR
DAMAGES DUE TO LOST PROFITS, DATA, OR INFORMATION ARISING OUT OF THE USE OR
INABILITY TO USE SUCH SOFTWARE EVEN IF PARALLEL TECHNOLOGIES HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OR CLAIMS. IN NO EVENT SHALL
PARALLEL TECHNOLOGIES' LIABILITY FOR ANY DAMAGES EVER EXCEED THE PRICE PAID
FOR THE LICENSE TO USE THE SOFTWARE, REGARDLESS OF THE FORM OF CLAIM. THE
PERSON USING THE SOFTWARE BEARS ALL RISKS AS TO THE QUALITY AND PERFORMANCE
OF THE SOFTWARE. This warranty gives you specific rights and you may have
other rights.

This agreement shall be governed by the laws of the State of Washington and
shall inure to the benefit of Parallel Technologies, Inc. and any
successors, administrators, heirs and assigns. Any action or proceeding
brought by either party against the other arising out of or related to this
agreement shall be brought only in a STATE or FEDERAL COURT of competent
jurisdiction located in King County, Washington.

=================================================================
= FBI WARNING =
= Failure to observe the restrictions of this license =
= may be a violation =
= of 17 United States Code sections 101 through 810 =
= which carries severe personal and corporate penalties. =
=================================================================
















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