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- Frequently Asked Questions
- ==========================
-
- GIF files:
- ---------
-
- WHERE DO GIF FILES COME FROM?
- WHERE CAN I FIND A DESCRIPTION OF THE GIF FILE FORMAT?
- WHERE CAN I GET MORE GIF GRAPHICS?
- HOW CAN I CREATE A GIF FROM A PHOTOGRAPH?
-
- The GIF (Graphics Interchange Format), pronounced "JIF", was designed by
- CompuServe and the official specification released in June of 1987. Since
- that time, it has become very popular, due to several factors.
-
- First, GIF uses an efficient compression routine which makes graphics files
- significantly smaller than in virtually any other format. Secondly, by
- design, it's an INTERCHANGE format. Graphics may be created by paint
- programs, fractal generating programs, on scanners or video capture boards.
- The originating computer might be an IBM, Apple, Color MAC, Amiga, or
- virtually any type of computer. Since most computers with graphics
- capabilities have (at least one) GIF display program, the graphics can
- easily be "moved" from one type of computer to another.
-
- In July of 1990, CompuServe released an extension to the GIF specification,
- known as Version 89a, adding a number of sophisticated features designed to
- make GIF a more powerful and flexible graphics format.
-
- As GIF was created by CompuServe, the Graphics Support forum (PICS) is the
- place to find complete, accurate, and up-to-date information about GIF. If
- you're not a CompuServe subscriber, but are seriously interested in trying
- graphics programming, I do recommend subscribing (call 1-800-848-8199,
- operator 229, to sign up or to verify current costs. As of 4/91 it's $39.95
- for a "start-up" subscription which includes a hard-bound user's guide, a
- subscription to the CompuServe Magazine, and $25 credit toward connect time,
- which is currently $12.50 per hour at 1200/2400 baud.)
-
- We've had a number of requests for "disks full of GIFs" or other graphics
- files. While CompuShow has been included on ShareWare disks with GIFs of
- various descriptions, these disks did not come from Canyon State Systems. We
- don't sell or distribute GIFs or other graphics files, with the exception of
- a few samples that are included on the enhanced program disk.
-
- The best place to look for GIF images is CompuServe; "GO GRAPHICS" for a
- menu of graphics forums, containing literally thousands of images and
- related files. GIF images are also beginning to appear in significant
- numbers on other commercial services and a number of BBS's.
-
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- [Q&A.DOC] Page 1
- +--------------------------------------------------------------------------+
- | The following registered users of CompuShow operate bulletin boards. |
- | Other registered users who would like to be added to this list, please |
- | contact me. |
- | |
- | We reserve the right to remove from this list any BBS which tampers with |
- | any CompuShow documentation or fails to comply with the requirement that |
- | CompuShow must be distributed unmodified and intact. |
- +--------------------------------------------------------------------------+
-
- JPix BBS 219-267-2188 (to 2400 baud) has a free public-access section and a
- restricted pay-per-access section. SysOp Jim Priser also operates a high-
- quality scanning service (download info/rates from the BBS or contact him by
- voice line at 219-267-3980.)
-
- New Dimensions BBS 408-274-5550 has a large and growing GIF library.
-
- The Godfather BBS 813-289-3314 has a free public-access section and an adult
- section requiring subscription.
-
- Adline USA BBS 708-260-8818 for GIF files online and a scanning service.
-
- Mating Mystique 612-890-1001 appears to be an adult-oriented subscription
- service.
-
- Converting to GIF:
- -----------------
-
- HOW CAN I CONVERT OTHER GRAPHICS TO GIF FORMAT?
- WHAT IS "COMPUMAKE TOOLS"?
-
- CompuMake Tools, our graphics conversion utility is described in CATALOG.DOC
-
- Integrating graphics with other software:
- ----------------------------------------
-
- MY COMPANY PRODUCES DATA BASE SOFTWARE, AND WE'D LIKE TO ADD GRAPHICS
- DISPLAY CAPABILITIES. CAN WE CALL COMPUSHOW FROM INSIDE OUR PROGRAM?
-
- There's been quite a bit of interest in adding graphics to database and
- other software, and we've developed a version with that in mind. Write or
- phone for details.
-
- Incompatible drivers
- --------------------
-
- WHY IS MY VIDEO OR PRINTER DRIVER SHOWN AS "WRONG DRIVER VERSION!"
-
- You're trying to use a driver designed for an earlier (or later) version of
- the program. The driver MUST MATCH the program.
-
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- [Q&A.DOC] Page 2
- Missing Files
- -------------
-
- WHY DOES A BOX POP UP EVERY TIME I RUN THE PROGRAM, SAYING THAT THERE ARE
- FILES MISSING?
-
- At program start-up, CompuShow checks to see that all the documentation and
- support files are on the same disk and sub-directory as the program. Once it
- finds all the files there and creates CSHOW.DAT, you can run CSHOWDEL.BAT to
- erase the documentation files, drivers, etc. that you no longer need.
-
- If you move the program to another computer, pass it on to a friend, or post
- it on a BBS, you must include all the original files. In addition, if you
- modify your computer (add memory, upgrade the video adapter, etc.) CompuShow
- will detect that it's not the same computer, and will look for the
- documentation and support files again (so keep a copy somewhere.)
-
- Not quite compatible VGAs:
- --------------------------
-
- MY LAPTOP COMPUTER CAN'T DISPLAY ANY OF THE "EXTENDED MCGA" MODES. HOW CAN I
- PREVENT THEM FROM BEING USED WHEN I PRESS THE SPACEBAR?
-
- These "PS/2 and register-compatible VGA" modes selected with the [ ] , . /
- keys do overdrive a few VGAs. Force VGA mode with "CSHOW +V" to disable
- them.
-
- Other Hardware-Specific Modes:
- -----------------------------
-
- I'VE GOT A NEW GRAPHICS ADAPTER THAT I'D LIKE TO USE, BUT THERE'S NO VIDEO
- DRIVER FOR IT. (Sometimes this question starts "I've got an OLD adapter...")
-
- The external video drivers used by CompuShow make it easy to add support for
- additional graphics devices. We'll continue to add video drivers as we
- become aware of new video hardware. If you have a new graphics adapter that
- isn't listed, we may already have a driver available for it.
-
- If you're an assembly language (MASM/TASM) programmer, and would like to try
- to develop a driver yourself, I can send you a "Video Driver Developer's
- Disk", which will let you add support for your video hardware. If you're not
- an assembler programmer, but have the programming specs, contact me, and
- we'll see if we can develop a driver together.
-
- Unrecognized Graphics Files:
- ---------------------------
-
- I DOWNLOADED A GIF FROM A BBS, BUT COMPUSHOW SAYS IT'S NOT A GIF
-
- It was probably uploaded by someone with an Apple computer, and has the
- infamous 128 byte "binary header". A legitimate GIF file starts with
- "GIF87a" (or "GIF89a") in the first six bytes, so this "header" which some
- Apple software tacks on the front end of the file, actually creates a
- corrupt GIF.
-
- Please contact the BBS SysOp. He probably has a program for stripping off
- the header, as BBSs frequently run into this problem with Apple uploads. In
-
- [Q&A.DOC] Page 3
- addition, he'll probably want to contact the uploader, so that future
- uploads can avoid this problem.
-
- I KNOW I'VE GOT A LEGITIMATE GRAPHIC IMAGE, BUT IT'S NOT RECOGNIZED
-
- Graphics such as MacPaint, PC Paint, PC Paintbrush, and Dr. Halo, can vary
- in format from one version to the next. Also, some programs which claim to
- produce "compatible" files, may not conform to the specification. We've made
- every effort to identify and support as many formats as possible, and have
- distributed Beta Test programs to attempt to track down graphics which
- CompuShow can't identify or display correctly.
-
- If you do find other examples, we'd appreciate a copy of the file, so that
- we can add support for the format. Keep in mind that some compression
- schemes (such as RIX) are confidential, so we may not be able to support
- them.
-
- CompuShow upgrades:
- ------------------
-
- WHAT'S YOUR POLICY ON UPGRADES FOR REGISTERED USERS?
-
- As we release new versions of CompuShow, registered users are notified by
- mail, and may upgrade for a "nominal cost". For the past couple of years,
- we've held this cost to $9, and have offered upgrades at $5 for anyone who
- registered (or upgraded) to the previous version within 60 days of the
- release of the new version. We'll try to stick to the $9/$5 upgrade prices
- as long as our costs hold relatively steady.
-
- I JUST SAW A NEW VERSION ON A BBS, BUT HAVEN'T RECEIVED AN UPGRADE NOTICE!
-
- New releases of CompuShow sometimes seem to travel at the speed of light.
- Our first step is to post a new release on CompuServe and GEnie and then
- mail copies to our list of BBS SysOps and ShareWare distributors. It may
- take a couple of weeks to mail notices to registered users.
-
- In addition, keep in mind that some "minor revisions" have relatively small
- changes that don't justify a mailing to all registered users. Registered
- users who want to upgrade to the latest "minor revision" should contact me
- for costs.
-
- Finally, keep in mind that you may have a COUNTERFEIT! Since December 1989,
- we've seen a number of programs claiming to be version "8.01", "8.31",
- "8.51", etc. appear on electronic bulletin boards. Generally these
- counterfeits have been "hacked" copies of version 7.0 or 7.2, with the
- documentation and on-screen version number changed (and this supposedly
- "new" version usually has 1989 file dates!) If you find the on-screen title
- about 12,700 bytes into the file (at hex offset 31A0h) then you definitely
- have a counterfeit!
-
- Our best guess is that these counterfeit programs are a direct result of
- BBSes that give "credit" for uploads. Evidentally, some people are so
- desperate to get credit that they'll "hack together" a counterfeit program
- when they don't have anything legitimate to upload. Apparently the only
- malicious intent is to disappoint anyone who's looking for the latest
- version, although there have been some (unconfirmed) reports of VIRUSES
- attached to some counterfeit programs.
-
- [Q&A.DOC] Page 4
- CompuShow Configuration and Drivers:
- -----------------------------------
-
- CSHOW.EXE IS IN A SUB-DIRECTORY POINTED TO BY THE DOS "PATH" COMMAND. I'VE
- USED CSHOWI TO INSTALL SCREEN COLORS, ETC. WHY DO I GET THE ORIGINAL COLORS
- AND OPTIONS WHEN I START THE PROGRAM IN A DIFFERENT SUB-DIRECTORY?
-
- CShow looks for the configuration file, the printer and video drivers on the
- same disk and sub-directory as the program. Actually, it depends on DOS
- (version 3 or above) to tell it where the EXE was found. If you're using a
- version of DOS below 3, add the following line to your AUTOEXEC.BAT file
- (assuming CSHOW.EXE is in C:\PROGS):
-
- SET CASSS=C:\PROGS
-
- When the program discovers that it's running under DOS version 2, it will
- look in C:\PROGS for the configuration file and drivers.
-
- The HP Laser Printer:
- --------------------
-
- THE PRINTER LIGHTS BLINK FOR A FEW SECONDS (INDICATING THAT IT'S RECEIVING
- THE GRAPHICS DATA) AND IT THEN EJECTS A BLANK (OR PARTIALLY PRINTED) PAGE.
-
- If you've loaded "soft fonts", the printer may "reject" the graphics data,
- since it doesn't have enough internal memory to store BOTH the soft fonts
- and the graphics data. You need to remove the soft fonts from printer memory
- to be able to print graphics. With minimum memory installed, you may need to
- use the 75dpi HP Laser driver, instead of the 150/300dpi driver.
-
- PCjr/Tandy Modes:
- ----------------
-
- THE PCJR/TANDY 1000 MODES DON'T APPEAR AS DISPLAY OPTIONS
-
- The #J command line toggle is used to enable these video modes. Starting
- with version 6, these were made "optional" modes, since they require the
- program to "reserve" 32k of memory. When #J is not used, the program can use
- this 32k for other purposes.
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- [Q&A.DOC] Page 5
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