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EQUAL PARTNERS Virtual disk system Version 1.10 K.eeping I.nformation S.haring S.imple "If you know DOS then you already know how to use Equal Partners." COPYRIGHT (c) 1985, 1986, 1987 by Downlink Systems Inc. ALL RIGHTS RESERVED This document describes the EQUAL PARTNERS virtual disk system, version 1.10, which was created by Downlink Sys. in December of 1986. INTRODUCTION EQUAL PARTNERS is the copyrighted property of Downlink Sys. Inc. You are granted a limited license to use , and to copy it and distribute it, provided that the following conditions are met: 1) No fee may be charged for such copying and distribution. 2) EQUAL PARTNERS may ONLY be distributed in its original, unmodified state. Contributions for the use of this program will be appreciated, and should be sent to: Downlink Systems Inc. c/o D. Conner 1377 K. STREET N.W. SUITE 189 WASHINGTON D.C. 20005 You may not use this product in a commercial environment or a governmental organization without paying a license fee of $40. Site licenses and commercial distribution licenses are available. A program disk and printed documentation are available for $40. See the order form in the back of this manual for more details. EQUAL PARTNERS is user supported software. This means that you may copy the shareware version freely and give the copies away to anyone you wish, at no cost. They in turn are requested to send in a contri- bution if they decide to use it. The user supported software concept (often referred to as shareware) is an attempt to provide software at low cost. The cost of offering a new product by conventional means is staggering, and hence dissuades many independent authors and small companies from developing and promoting their ideas. User supported software is an attempt to develop a new marketing channel, where products can be introduced at low cost. If user supported software works, then everyone will benefit. The user will benefit by receiving quality products at low cost, and by being able to "test drive" software thoroughly before purchasing it. The author benefits by being able to enter the commercial software arena without first needing large sources of venture capital. But it can only work with your support. We're not just talking about EP here, but about all user supported software. If you obtain a user supported program from a friend or colleague, and are still using it after a couple of weeks, then it is obviously worth something to you, and a contribution should be sent. Upon receipt of a contribution, you become a registered user and will receive a "full" feature, serial- ized version of EQUAL PARTNERS. ii I. WHAT IS EQUAL PARTNERS. Equal Partners is a software solution to the problem of sharing data between 5 1/4 floppy based PC's and the new emerging convertibles and lap-tops that use the 3 1/2 floppy drives and diskettes, between different PC's with dissimiliar disk(ette) storage media, or between different PC's with identical recording media!. Equal Partners addresses this problem by using inexpensive RS-232 serial adapters , software device drivers and communication programs to attach the physical drives of one PC to the DOS operating system of another PC. These physical drives become an extension of and to the operating system of the other PC so that all DOS functions that use a drive letter,to access data, function without concern that these 'virtual' drives are not truly physically attached to the floppy/hard disk controller cards. II. WHY USE EQUAL PARTNERS Equal Partners provides a cost effective solution,as opposed to the solution that IBM provides. IBM's solution is hardware based and requires an additional out-of-pocket expense in the neighborhood of $500.00. Equal Partners allows you to try its low cost solution for a reasonable time. Then if you realize the cost savings, to compensate the authors for their efforts and for your peace of mind. We are sure you would rather use the $500.00 you saved, to invest, expand and/or enrich your life in other ways. - 1 - III. HOW DO YOU ACQUIRE USAGE RIGHTS TO EQUAL PARTNERS. Equal Partners is not totally free, a small contribution is asked to allow the authors to feel that their efforts did not fall on unfertile ground. The contribution can consist of several forms: FOR INDIVIDUALS ---------------- 1. Monetary -------- A registration and usage fee of $40.00 is asked, of individuals. This will provide you with notices of upgrades and fixes, as well as allow you access to a version supporting additional com ports and faster transfer speeds plus other additional features. 2). Personal -------- Another alternative , if money is a major negative factor, is that we deeply request that you give a part of yourself. Instead of a pound of flesh, a donation to your local Red Cross of 1 pint of blood so that another may 'profit' from your 'gain'/'loss'. This is the least contribution asked and expected. FOR COMPANYS ------------ 1) Monetary -------- For businesses, that benefit from additional utility and time/cost savings, a per copy or site-license is available and required. Otherwise, no usage license is granted, and any use is strictly prohibited. - 2 - IV. HOW DO YOU USE EQUAL PARTNERS First read the section on REQUIREMENTS, to see if your machine and its hardware configuration can meet the necessary requirements. Secondly, install Equal Partners (see INSTALLATION section). Now the easy part begins. You say, "nothing is ever easy". We say , "if you know DOS then you know how to use Equal Partners". Granted you may not, yet, be a "POWER USER", but we bet you know how to see whats on your disks, does the "DIR" command ring a bell. Now that you know whats there, we also bet you got it there with the DOS "COPY" command or someone did. Starting to catch on yet, we havent tried to teach you any new convoluted commands with unfamiliar structure and syntax , have we. Guess what!!. You have just graduated from the ACME self study and enlightment course that certifies you as a "POWER USER" of Equal Partners. Take a break, you deserve it. Oh, come back later to get your EPPU 'certificate of achivement'. Back so soon?. Now to the serious business side of matters. You have all this data , in some form or another, and you need to : consolidate/manipulate/share/archive/transport it between/among/with/to another/same media on another PC. Being a Equal Partners "POWER USER" (EPPU), you know that all you have to do is use the DOS "COPY" command. So, do it, and give yourself a pat on the back for a job well done. We could go on with how to use the other DOS commands, but we are sure you are ahead of us already. What more can we say, in 25 words or less, that would not confuse you. Again let us stress, if you need to access data on the 'server' PC, just use the DOS commands and the disk drive letters of the 'virtual drives' that are now logically attached to your PC. Also, we are sure that you have guessed by now, that if you can tell DOS where to get the data you need, for a program it should be just as easy. Sure is, just 'tell' the program that the data it needs is on one of the 'virtual drives' and business should continue as always (unless that 'break-even' analysis formula in the spreadsheet is in error). - 3 - REQUIREMENTS ------------ The hardware requirements are: 1). Your machine must be an IBM PC/XT/AT or highly compatible, including laptops and convertibles. 2). The machine uses an 8250 uart,or compatible, to handle the RS232C communications. 3). The RS232C cable must have pins 2 and 3 crossed or a straight thru cable with a null modem. 4). The machine uses the port addresses at memory location 0:400. The port addresses are 03F8 for COM1, and 02F8 for COM2. 5). The disk media must be Dos formatted, in other words the boot sector must contain the BPB info that describes ------------------------- the media (the media type in the FAT is not used). Some vendors that format their own disks do not bother to put the BPB info in logical sector 0, even thought the Dos 3.2 Technical Ref. manual says that Dos will no longer rely on the Media code in the FAT to determine the device characteristics. 6). As always, sufficient memory must be available. The software requirements are: 1). The operating system must be PC Dos 2.0 or above. This product has been tested on PC DOS 2.0 , 2.1, 3.0, 3.1, 3.2 and 3.21. 2). The PC DOS versions running on both the "server" and the "remote(s)" SHOULD be identical!! - 4 - INSTALLATION ------------ Equal Partners consists of the following files: 50-50.SYS - device driver EQUAL.COM - communication program PARTNERS.COM - communication program PARTNERS.DOC - this documentation SERVER.BAT - example batch file, with ERRORLEVEL checking REMOTE.BAT - example batch file, with ERRORLEVEL checking ????????.??? - any additional files as the product matures Installation assumes two PC's, and the need to exchange data between the PC's. One PC will be designated the 'server' PC and the other PC(s) the 'remote' PC(s). The PARTNERS.COM program may be loaded on and is normally run from the 'server' PC. The 'server' Pc could be considered the 'base' PC in that it would normally contain all the master database and spreadsheet programs and files. The 'remote' PC(s) could be lap-tops that individuals had taken 'on-the-road' with them to gather data, for updating to the 'server' databases..ect. So, installation on the 'server' of PARTNERS.COM consists of -------------- 1). Copying PARTNERS.COM to a directory in the DOS path, and typing the command , 'PARTNERS' or including it in a Dos batch file. Command format: PARTNERS [/COMx] where the parameter in "[]" is optional and indicates the hardware port to use for communications. Replace the "x" with "1" or "2" to override the installation default. Note: the "[]" are NOT part of the command!. Note: the install results may be tested in a batch file with the ERRORLEVEL statement. - 5 - Now, installation on the 'remote' consists of -------------- 1). Including the following command in 'CONFIG.SYS' DEVICE=50-50.SYS 'z' additional disk drives requested (where 'z' can be any number from 1 to 8, default=1) 2). Copying EQUAL.COM to a directory in the DOS path and typing the command, 'EQUAL' or including it in a Dos batch file. Command format: EQUAL [/COMx] where the parameter in "[]" is optional and indicates the hardware port to use for communications. Replace the "x" with "1" or "2" to override the installation default. Note: the "[]" are NOT part of the command!. Note: the install results may be tested in a batch file with the ERRORLEVEL statement. Once installed , any DOS command that would normally access data using a drive designation, will be able to read/write data from one PC to the other PC(s). What this means is that you can 'COPY', , 'ERASE', 'RENAME', 'PATH', and execute programs to/on/from the 'virtual' drives without any new commands or procedures. If you know DOS then you already know how to use Equal Partners. - 6 - RAMDISK SUPPORT If you have a RAMdisk, or other high-speed storage, then you can speed up EP somewhat by telling DOS to read from/write to the RAMdisk. You do this by substituting the drive letter of the RAMdisk in all the MS-DOS commands. For example, if drive H: is your virtual RAMdisk, then you would type: COPY H:*.* D: (where D: could be a RAMdisk on your 'remote' PC) Refer to the MS-DOS manual for more details about the DOS commands. - 7 - PROGRAM EXECUTION RESTRICTIONS If are using a Shareware version on EQUAL PARTNERS, and have not registered, then the following program executions restrictions apply: 1). Only 9,600 baud transfer rate is available. 2). Only Com1 is supported. 3). Only one virtual drive may be specified in config.sys. 4). Only reading is allowed, in otherwords you may only copy data "from" the server. You are not allowed to perform any Dos function that would "write" to the server. 5). The starting drive on the server is always the "A:" drive. This means that the first virtual drive assigned on the "remote" is the first physical drive accessed on the "server". 6). Also some storage devices, such as a Bernoulli box, may cause timing problems due to the fact that it may require several seconds for the Bernoulli box to come up to speed. - 8 - DISK DRIVE MAPPING This simple illustration shows how the drives and the letters assigned are mapped to the physical vs. virtual drives. 'REMOTE' 'SERVER' +---------------+ +---------------+ | +---------+ o| | +---------+ o| | |A:>dir C:| o| | | Partners| o| | | | | | | v1.1 | | | |Volume in| | | |Copyright| | | +---------+ | | +---------+ | +---------------+ +---------------+ +------------------------+ +------------------------+ | IBM o o | Rs232 ---- cable | IBM + o | | PC --=-- --=-- | ---------| |---------| PC --=-- --=-- | | |<-- ---- | | +------------------------+ | +------------------------+ ^ ^ | ^ ^ ^ | | | | | | | | | | | | Physical Physical | Null Physical Physical Drive A: Drive B: | Modem Drive A: Drive B: | | ^ ^ | | | | | | | -------------------------> Virtual Virtual Drive C: Drive D: There may be Ramdisks on either or both the 'SERVER' and 'REMOTE' PCs. Ramdisks are highly recommended, memory permitting, because this eliminates all the mechanical delays that real hardware drives exhibit, such as rotational delay, seek times and drive startup..ect. - 9 - Usage Example NO. 1 This simple illustration shows how EQUAL PARTNERS was used to dial a remote BBS, with PCTALK III V7.01XA, and transfer data to/from the "server" while BBS communications was maintained on the "remote". This example was actual used by the authors. We could also invision a BBS being run on the "remote" and the "server" being used as non-dedicated aux. storage for the BBS. | | ^ | | | --------- to phone line +--------+ | o o o | <----- external modem +--------+ | | Com2 | | 'REMOTE' 'SERVER' +---------------+ +---------------+ | +---------+ o| | +---------+ o| | |A:>PC-TAL| o| | | Partners| o| | | | | | | v1.1 | | | | | | | |Copyright| | | +---------+ | | +---------+ | +---------------+ +---------------+ +------------------------+ Com1 +------------------------+ | IBM o o | Rs232 ---- cable | IBM + o | | PC --=-- --=-- | ---------| |---------| PC --=-- --=-- | | | ---- | | +------------------------+ +------------------------+ - 10 - Usage Example NO. 2 This simple illustration shows how EQUAL PARTNERS could be used to collect data from various other PC's. As an example, lets say that you are in the insurance business. Your company has an AT in the home office and you have your agents out in the field taking orders and collecting premiums. The agents were given lap-tops , with 3.5 drives. Now you need to get the information stored on the lap-tops to the AT to update the databases. The PARTNERS half of EQUAL PARTNERS could be activated on the AT and as each agent comes in they just "plug" into the RS232 cable attached to the AT. PARTNERS, on the AT, does not care what the other devices are on the end of the RS232 cable at any given time. PARTNERS will automatically adjust to the drive character- istics of what ever "remote" drive unit it reads. So, you can "plug" into the cable attached to the AT, then when through, "unplug" and "plug" in another "remote", wheather it be a laptop with 3.5 drives, a laptop with an internal harddisk, or PC/XT/AT with a DOS formatted disk drive of some type. 'SERVER' +---------------+ | +---------+ o| | | Partners| o| | | v1.1 | | | |Copyright| | | +---------+ | +---------------+ +------------------------+ | IBM +----+ --=-- | | AT |o | --=-- | | +----+ | +------------------------+ | | +-----+ | | <----- null modem +-----+ | | mmmmm Agent "A" Agent "C" wwwww wwwww wwwww | | | +-------------+ +-------------+ +-------------+ | +---------+ | | +---------+ | | +---------+ | | |A:>COPY | | | |A:>COPY | | | |A:>COPY | | | | | | | | | | | | | | | | | | | | | | | | | | | +---------+ | | +---------+ | | +---------+ | +-------------+ +-------------+ +-------------+ +-----------------------+ +------------------------+ +-----------------------+ | IBM convertible | | Zenith 181 | | Toshiba 3100 + | +-----------------------+ +------------------------+ +-----------------------+ - 11 - Usage Example NO. 3 This simple illustration shows how EQUAL PARTNERS could be used to share data among various PC's. This example shows a "server" attached to a "switch box" by a RS232 cable. A switch box allows the manual switching of internal connections between one "common" and several other devices attached as "A","B","D" and "E" and such. The devices are connected through "C" and what ever setting the physical switch is pointing to. This arrangement could allow several PC's to be attached to a "server" and data updated on the "server" or the "server" used just to store the data prior to "switching" it to another PC. The "server' does not have to be dedicated, only activat- ed when actual data transfer is needed. 'SERVER' +---------------+ | +---------+ o| | | Partners| o| | | v1.1 | | | |Copyright| | | +---------+ | +---------------+ +------------------------+ | IBM +----+ --=-- | | AT |o | --=-- | | +----+ | +------------------------+ | | +--------+ | | <----- null modem +--------+ | | +----------------+ | C | | / | | / | <---------- Switch box | a b d e | +----------------+ ^ ^ ^ (a) | | | (d) +------------------ | ----------------------------+ | | | | +----+ | | | (b) | | | | +-------------+ +-------------+ +-------------+ | +---------+ | | +---------+ | | +---------+ | | |A:>DBASE | | | |A:>COPY | | | |A:>WORD | | | | | | | | | | | | | | | | | | | | | | | | | | | +---------+ | | +---------+ | | +---------+ | +-------------+ +-------------+ +-------------+ +-----------------------+ +------------------------+ +-----------------------+ | IBM AT --=-- | | Zenith 181 | | Toshiba 3100 + | +-----------------------+ +------------------------+ +-----------------------+ - 12 - PROGRAM UPDATE SERVICE A license to EP entitles you to use all future Shareware versions. New "restricted usage" versions are generally available through normal freeware distribution channels, and we prefer that you obtain them that way. A Program disk containing the latest version is returned on every order of $40 or more. If you wish to purchase a single-user license and want an update disk, please enclose a check or money order for $40. For a fee of $50 per year you can subscribe to our program update service. Subscribers get up to five program updates per year mailed to them as new versions come out. This does not include trivial releases. - 13 - VERSION NUMBERS All of our version numbers are given as a number with two decimal places. The units indicate a major revision, such as adding a new feature, maybe such as virtual printer support. The first decimal place (tenths) indicates a minor revision that is not essential, but which may be desired. The second decimal place (hundredths) indicates a trivial revision that will probably only be desired by specific individuals or by die- hard "latest version" fanatics. To sum up: If the units change, then you should get the newer version as soon as you can. If the tenths change, then you may want to get the newer version, but there's no hurry. If anything else changes, then you probably shouldn't bother. - 14 - TECHNICAL REQUIREMENTS AND NOTES -------------------------------- Equal Partners uses the RS-232C hardware to interface the PC's and provide the 'bridge' to allow the exchange of data. The hardware consists of the standard 8250 uarts and the DB-25 or DB-9 connectors and cables. However , only pins 2, 3, and 20, are used. Also pins 2 and 3 are required to be crossed-over, or you can build or purchase a modem eliminator/null modem. (See your local electronics parts dealer: such as RADIO SHACK) This is the basic diagram of the CROSS-OVER pin configuration 'SERVER' 'REMOTE' ------ ------ | | | | | 2 |--------------\ /|2 | Pins | | / | | | 3 |--------------/ \|3 | | | | | | 20 | ----------------|20 | ------ ------ DB-25 DB-25 - 15 - The following are notes and considerations both technical and otherwise, these must be noted and HEEDED: 1). Both EQUAL.COM and PARTNERS.COM use COM1 or COM2 as the 'bridge'. The port addresses are disabled so that Basic will not interfere, as Basic tries to take over the com ports when loaded, even if does not need them. Com1 is only available for the shareware version. The program , 'PARTNERS.COM' will revector and restore the com ports addresses when it is de-actived however. 2). The program ,'EQUAL.COM', installs resident and attaches itself to DOS, so that once installed its there to stay. 3). The data transfer rate is 9,600 baud for the shareware version. Registered users may select rates up to 110,000 baud. 4). Error checking is performed on each block of data. Crc-16 is used to insure the integrity of your financial data and programs. 5). Ramdisks with sector sizes between 128 and 512 bytes are supported. This applies to other disk media as well. The sector sizes must be a power of 2. 6). The operating systems on ALL remote(s) and the server SHOULD/MUST be identical. Mixing DOS versions accessing the same data and media MAY/WILL cause problems. Some versions of DOS do not support media types made available in later versions of DOS, so some DOS utilities may not function correclty when accessing disk media or using function calls that were added/modified in later releases of DOS (ex: CHKDSK). - 16 - Appendix A - Program Messages. All message text is preceeded by a formatted message code. The format of the message code is: EPxNNNy where : x= 'D' - for 50-50.SYS program output messages 'E' - for EQUALS.COM program output messages 'P' - for PARTNERS.COM program output messages and NNN= 000 thru 999, which is the message number for this message type. and y= 'D' - for Dignostic type messages. These messages are normally printed only if a critical error occurs or the program is in a 'test' or debugging mode. 'E' - for Error messages. These type messages indicate that an unrecoverable error occured and the program could not take any corrective action, except to attempt to return to the DOS prompt. 'I' - for Informative messages. These messages are just to inform you as to the processing state of the program at any given time. 'W' - for Warning messages. These messages indicate that an error occured, but that the program was able to take corrective action and continue processing. However, the function the program was attempting may or may not have been successfully completed. - A1 - Message Code Message text and its explanation ------------ ---------------------------------------------------- EPD001I - EQUAL PARTNERS Virtual disk driver V1.10 (C)Copyright DOWNLINK SYS. INC. 1986 This is the copyright message displayed from the virtual disk device driver during PC power-up. EPD002I - 1 virtual disk drive(s) available to DOS This message indicates the number of additional disk drives ('virtual') that DOS can access. These drives may be accessed by the DOS commands or any program by using the drive letters assigned, by DOS, to the virtual disks. Registered users may access up to 8 virtual disks, the shareware version allows access to only 1 virtual disk. EPE001E - installation cancelled - COM channel undefined The program was trying to install, but was unable to find a communications port address at the desired memory location. The only recourse is to return to DOS. EPE002E - installation cancelled - 50-50 driver not installed The device driver, 50-50.sys, was not included in the DOS file 'config.sys'. If your intent is to run this PC as a 'remote', then see the INSTALLATION section for the correct program configurations. EPE003E - installation cancelled - ALREADY installed The program EQUAL.COM has already been installed once. Multiple installations are not allowed. EPE000I - EQUAL activated - Communications link is COMx This message relects that the installation of EQUAL is in progess and that the Communications port, COMx, was the port selected to link the "remote" to the "server" EPE001I - EQUAL installed - Virtual drives C: thru C: available for use This is the most important type 'I' message that is displayed. This message reflects the additional 'drive' letters you use on all DOS commands and in programs, to access data on the 'server' PC. The drive letters displayed depends on the number of virtual drives requested (up to 8 allowed) on the 'device=50-50.sys' statement in the DOS 'config.sys' file. EPE999I - EQUAL shutdown - returning to DOS This message indicates that EQUAL.COM is returning to DOS. See any additional messages for the exact reason. - A2 - Message Code Message text and its explanation ------------ ---------------------------------------------------- EPP001E - installation cancelled - COM channel undefined The program was trying to install, but was unable to find a communications port address at the desired memory location. The only recourse is to return to DOS. EPP002E - installation cancelled - EQUAL is already installed The program is trying to be installed on a machine that already has the EQUAL.COM program installed. You can't make one machine both a 'remote' and a 'server'. EPP000I - PARTNERS activated - Communications link is COMx This message relects that the installation of PARTNERS is in progess and that the Communications port, COMx, was the port selected to link the "server" to the "remote". EPP001I - PARTNERS installed -waiting for remote responce You have entered PARTNERS from the Dos prompt or in a batch file. PARTNERS is now installed (not resident) and is waiting for RS-232 input on the communications port. The programs EQUAL.COM and 50-50.SYS have to be installed on the "remote" computer to complete the "bridge",so that data may be freely transfered between computers. EPP999I - PARTNERS shutdown - returning to DOS You have either pressed the 'ESC' key or installation failed. EPP001W - Invalid I/O request - flushing input buffer Extraneous or corrupted information was received. The programs only recourse is to ignore the data, flush all buffers and try to get in sync with the other PC. EPP001D - AX= BX= CX= DX= This message displays the internal register states. The message is normally display only when a critical error occurs or the programs debugging mode is active. EPP002D - - This message is preceeded by message code EPP001D. Several additional message lines will be displayed indicating the reason for this diagnostic message. - A3 - Appendix B - Site License SITE LICENSE Corporate users may wish to obtain a site license for the use of EP. The site license applies only to one geographical area, not to exceed a 50 mile radius. Additional site licenses are required for each unique geographical location. Please use the order form in this manual to order a site license. Site licenses are granted when we receive your payment. License fees vary depending on the number of computers on which EP will be used, as follows: 1 to 9 copies $40 each 10 to 24 copies $35 each 25 to 49 copies $30 each 50 to 99 copies $25 each over 99 copies $3000 one time fee The following page is a site license agreement, which should be signed and sent with your payment when ordering a commercial site license. - B1 - The use of EP in a commercial environment or government organization is granted under the following terms: 1. Payment of the license fee must be made payable to Downlink representative D. Conner The fee is based on the number of computers which will be used to run EP , as follows: 1 to 9 copies $40 each 10 to 24 copies $35 each 25 to 49 copies $30 each 50 to 99 copies $25 each over 99 copies $3000 one time fee 2. You may use EP on the number of computers included in the license fee. If you have paid the fee for over 99 copies, then you may use EP on any number of computers within your organization, within a given geographical area. 3. You may make copies of the program and documentation, in their original, unmodified form. You may distribute these copies, within the limits of the number of copies licensed. 4. You may make copies of the program documentation, in both its printed form and machine readable form, without restriction. 5. You may use all future "restricted-usage" Shareware versions of EP under this license. The latest version is available from Downlink for a small service charge. 6. You may NOT modify the program or charge a fee for copying or distributing the program or its documentation. 7. It is your responsibility to make the necessary copies and to deliver them to the computers which they will be used on. 8. We are not responsible for anything that may happen or not happen if you use EP. You're on your own. I agree to abide by the terms and conditions of this license. _____________________________ __________________________ Signature Date _____________________________ Name (please print or type) _____________________________ Title _____________________________ Company - B2 - Appendix D - Ordering ORDER FORM Check which items you wish to purchase: (_) Noncommercial license for the use of EP. (_) Commercial license for the use of EP on ___ computers (see price schedule and terms on preceding page). (_) Program update subscription service (not more than five updates, does not include trivial changes), $50/year. (_) Payment of $_____ is enclosed (check or money order). Signature: ________________________________ _______________________________________________ Name _______________________________________________ _______________________________________________ Address ______________________ ________ ____________ City State Zip Send this completed form to: Downlink Systems Inc. c/o D. Conner 1377 K STREET N.W. SUITE 189 WASHINGTON D.C. 20005 For program disk orders outside the U.S., please add an additional $5, and enclose an international money order payable in U.S. currency. For commercial site license orders, please enclose a signed copy of the site license agreement. Inquires for Corporate wide unlimited usage licenses are welcome. - D1 -