       Church bell change ringing demonstration on RISC-OS computers.
                 Tested on versions of RISCOS 3, 4 and 5
         including an A4, 7500FE, kinetic StrongARM RISC PC, Iyonix
                     and VirtualAcorn on a PC.

                     Kate and David Crennell,
       'Fortran Friends',PO Box 64, Didcot, Oxon, OX11 0TH.
              Email: KMCrennell@argonet.co.uk
              URL: http://www.argonet.co.uk/users/fortran/


The accompanying application, !Callchnge, animates a band of from 5 to 16
bellringers and allows you to change their order of ringing in the standard
way. A selection of named changes are described in 'Docs.TryThese' to help
you with some ideas. If you do not ring church bells yourself, you should
read the file 'Docs.Intro' and look at the Draw file 'Docs.Strokes' in the
application. Operating instructions are in the !Help in the application. The
images may be very distorted if you do not use a high resolution screen
mode.

The software is free but remains our copyright:

*   you must not alter the code in any way without our consent but may  *
*   distribute it to others in its entirety for non-commercial use.     *
*   The users of such copies should be asked to send us a donation.     *
*   towards bell restoration (cheques to 'Fortran Friends'              *
*   at the address above.                                               *

If you find it useful or just fun we should appreciate your registering your
interest by sending us your name and address, preferably by email, and a
donation (minimum 5, cheque payable to K.M.Crennell at the above address)
which we will pass on to a local tower for bell restoration.

We appreciate suggestions for improvements from registered users. If there
is sufficient demand, we can change the algorithm to allow 3 or 4 bells, 
let more than one change be stored at a time, or support interactive help.

We have a web page for RISC-OS ringing applications:
    http://www.argonet.co.uk/users/fortran/Bells/
If you know of any other ringing applications for RISCOS, please let us know
so that we can add them to these web pages. There are also some useful links
to a glossary and some 'Learn to ring' pages.

We thank John Norris and Alan Griffin for their help in correcting the
ringing style in the animations.

                        Disc Contents
                        -------------

Within the application !CallChnge, there are four directories (to see them,
hold down Shift while double-clicking <Select> on the !CallChnge filer
icon):-

Docs:       documentation directory with the following files:
 DataFormat the format of the data file for storing call changes
 Intro      introduction to church bell ringing
 Operation  Draw file of detailed instructions for the ringing window;
            print this to help you when making 'changes'
 Pitch      how to correct the pitch of the sound. This is especially
            important if you are using the program on VirtualAcorn
 Strokes    Draw file showing the two strokes used in church bell ringing
 TryThese   introduction to Call Changes you can try.

Modules:
 ABCLib     the ABCLibrary version 4.14, necessary to run the compiled
            BASIC code.

Examples:   directory of examples of call change sequences which you can
            play back.

Resources:  directory of data used by the program
 churchbell sound sample of church bell
 D16/spr    animation sprites for 16 colours
 D256/spr   animation sprites for 256 colours
 Options    users settings stored from one session to the next
 pitch      change from standard pitch (see Docs.Pitch)
 Templates  window definitions
