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- Graphics decoding utilities for Nevryon
-
- These three utilities provide the means to produce sprite (FF9)
- files from the graphics files of the game Nevryon, thus allowing
- you to take a closer look at the artwork etc.
-
- Legal Stuff:
- Firstly, copyright exists on these three programs, but they have
- been placed in the Public Domain, and so can be copied and given
- to others without fear of prosecution, so long as no profit is
- made. Secondly (and more seriously) ALL parts of the game Nevryon
- are copyright (to the 4th Dimension, and probably Graeme
- Richardson as well) and it is ILLEGAL to give any part of the
- game, decoded or not, to anybody else or to use any part in your
- own programs. I cannot be held responsible for anything that
- happens as a result of the use (or misuse) of these programs. In
- other words, if you rip the graphics and use them in your own
- games, that's your problem and nothing to do with me.
-
- Making sure the programs can run:
- The programs assume the currently selected directory (CSD) is the
- one where the data files are to be found (and saved to). It this
- is not the case they will crash. If they are being used from a
- floppy disk it is wise to *DISMOUNT the appropriate drive, and
- use the root directory. As well, each program requires
- approximately 220k of memory to run successfully (due to the
- large size of the files generated). This shouldn't pose any
- problems, even on a 1Mb machine though. Lastly, each program
- assumes 80k of screen memory is available, though this should
- usually be the case as most people will be using the desktop in
- mode 12 (or 20) which means enough screen memory will be
- available.
-
- A bit about Nevryon's graphics and their storage:
- There are three main types of graphic in the game, namely the
- title pages, end screens and other miscellany, the background
- graphics (ie. the walls, floors, pipes, buildings and
- interestingly also some of the guardians), and the foreground
- graphics (ie. the aliens, explosions, your ships, bombs, laser
- shots, missiles, tokens). Each is stored in a compressed format
- on the disk.
-
- Clearly then, the first thing to do is to decompress the files so
- they can be manipulated further. In the case of the title pages,
- etc nothing further can be done with them after their decoding,
- and so the program used will simply save them to disk in the
- *SCREENSAVE format (if you want it done). It turns out that this
- is also the case with the foreground graphics. When decoded, they
- reduce to a standard Archimedes sprite file which can be loaded
- straight into !Paint.
-
- The background graphics, however, need to be processed further
- after their decompression, as they are not stored as 'proper'
- sprites. Another program is supplied to change them into a
- useable format.
-
- NB: The background graphics for levels 7 and 8 are not compressed
- and are stored on disk 2 in normal sprite format. They can be
- loaded into !Paint and examined without needing any special
- treatment.
-
- List of data files, where to find them, and their format:
- Disk Directory Filename Format
- 1 $.1 BACKG Background
- 1 $.1 BACKG2 Background
- 1 $.1 SHIPS Foreground
- 1 $.1 SHIPS2 Foreground
- 1 $.Pix ENDSCREEN Picture
- 1 $.Pix TITLEPIC Picture
- 1 $.Pix STARTSC Picture
- 1 $.Pix GRAPHIX Foreground
- 2 $.2,3 and 4 SHIPS Foreground
- 2 $.2,3 and 4 SHIPS2 Foreground
- 2 $.2 and 3 BACKG Background
- 2 $.2 and 3 BACKG2 Background
- 2 $.4 BACKG Sprite (FF9) background
- 2 $.4 BACKG2 Sprite (FF9) background
-
- How to use the programs:
- Before starting to play with the files, it is recommended that
- the utilities be copied to a blank floppy disk, a hard disk with
- more than 1Mb free, or a RAM disk of similar size. When
- decompressed, the files will NOT fit onto a single floppy disk,
- but having 800k or so free means that transfer of files to and
- from the disk can be less frequent (as more can be copied in one
- go).
-
- The first thing to do is to copy over the files that are to be
- decoded from Nevryon game disk 1 or 2, onto the disk that holds
- the utilities. I would recommend that only 2 or 3 be transferred
- at a time, unless you're using a hard disk or a large (2Mb+ RAM
- disk).
-
- Next, consult the file list above, to find out which sort of file
- it is. Depending on this, follow the appropriate procedure
- detailed below.
-
- If the file is a foreground file:
- Run NevDecode and give the name of the file. The compressed file
- will then be decoded and a file called 'Unpacked' will appear on
- the disk. This file can then be renamed to whatever you want. Its
- filetype must be set to FF9 (ie. Sprite) using either *SETTYPE or
- an application (if you have one). The original file can now be
- deleted.
-
- If the file is a picture file:
- Run NevScrShow and give the name of the file. If you want the
- result to be saved to disk then answer 'Y' to the question that
- follows. The file will then be read in and the uncompressed
- picture will appear on the screen. When the end of the file has
- been reached the image on screen will be saved (if this has been
- asked for) using *SCREENSAVE. The program will then end. Pictures
- are saved using the name 'Screen' and can then be renamed to
- whatever you want. The original (ie. compressed) file can now be
- deleted.
-
- If the file is a background file:
- Run NevDecode and give the file's name. When the program has
- finished, run NevBackSpr (no names need to be given) and the
- program should be seen to be displaying the background blocks one
- at a time in the top left-hand corner. When every block has been
- displayed the entire file will have been converted and the
- program will save it to disk under the name 'BackgSpr'. This file
- can then be renamed to whatever you want. The original compressed
- file can now be deleted, along with the 'Unpacked' file that was
- created during the conversion process.
-
- If the file is a sprite background file:
- No conversion is necessary to be able to examine these graphics.
- The file can be loaded straight into !Paint, or whatever else you
- want to do with it.
-
- What to do with your files once they are uncompressed:
- You might like to write a program to create example screens using
- the background graphics, or to have a go at animating some of the
- foreground sprites yourself. I would certainly suggest you take a
- close look at them using !Paint, as they contain many fine
- details of movement and animation that go unnoticed during the
- heat of actaully playing the game.
-
- Acknowledgements:
- Graeme Richardson and Peter Gillett for producing such a good
- game, and in particular Graeme (and his unnamed friend) on the
- wonderful graphics. Hope you don't mind my messing about!
-
- Finally:
- Has anybody noticed a bug in the game? After completing the
- eighth level (either using a password or from the start) the game
- displays the usual stuff about bonuses, etc and then accesses the
- disk. On my copy it then crashes. Is this common to all versions
- (I don't think it can be my machine as I don't have any upgrades
- and I reset the configuration to factory standard to make sure)
- or could it just be because my copy is quite an early one (I
- bought it at the Acorn User 1990 show). Does anybody know what is
- happening?
-
- Graham West - 24 August 1991.
-