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Fractals/!Julia/!Help/Readme
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
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| Filename: | Fractals/!Julia/!Help/Readme |
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| File size: | 28AD bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
________________________________________________________________________
/ \
| !JULIA v1.10: Quadratic Julia Plotter |
| 18 May 1991 |
| by Mike Curnow |
\________________________________________________________________________/
Introduction
============
!Julia is a fast desktop Julia plotter that provides virtually unlimited
exploration of the quadratic Julia set. It provides full zooming, restart
and colouring facilities, and multi-tasks where appropriate. It uses fast
integer arithmetic to magnifications of around 60,000, then switches to
floating point there on. The Julia image is displayed in 256 colours.
A brief guide to usage.
----------------------
Double click on the filer icon, then click on the icon-bar icon to display
the initial Julia set. Press Menu and then select Zoom. Use the left mouse
button to zoom in, and the middle button to zoom out. Press the right button
to start the redraw operation. At low magnifications the machine will be
locked until the redraw is complete (usually less than 3 minutes).
At high magnifications (you will notice the dramatic speed decrease) you can
return to the desktop while plotting continues, by pressing Menu twice and
selecting Hide.
The Display menu option gives access to previous images and various colour
modifications, whilst Hide temporarily closes the window. Note however that
when in full screen mode that the desktop is still active - its just that
the other windows are hidden.
The screen can be saved by using the Save option. Saved drawings may be
reloaded by simply dragging the saved sprite onto the !Julia icon, allowing
zooming to re-commence.
Full Operation Information
==========================
!Julia requires a considerable amount of storage : 300k for itself, 160k for
a Mode 15 screen and 60k for the shared C library, so be prepared. The Julia
plot is displayed as a full screen window which may be hidden at any time by
selecting Hide from the menu.
Automatic Last Display Save
---------------------------
All operations which modify the Julia image will save the current display in
memory, except for Invert which is self cancelling. The prior image may be
recalled by selecting Previous from the menu. Thus you can zoom in to
inspect an area, then quickly back out to the previous display. To maintain
further images use the load and save facilities.
The Menu Options
----------------
The menu options are available from the icon bar or from the full screen
window. All options except Zoom and Hide will work from the icon bar, though
obviously you will not see colour effects until you open the window.
Pressing Adjust instead of Select will keep the menu open.
ZOOM: Activates the zoom box and re-plotting process. Moving the mouse moves
the box, even beyond the edge of the screen. The mouse buttons have the
following effect:
Left: Zoom in
Middle: Zoom out (max. 2 times magnification)
Right: Start zoom
On pressing Start the new display will be drawn. For magnifications up to
60,000 times it is not possible to interrupt the re-draw. For higher
magnifications, the plotting will commence in dedicated mode (which is the
fastest) until you press Menu, at which time desktop mode is re-entered. The
plotting will continue in the background and the screen will not be
automatically updated.
To see the state of the display when in background mode, Hide the screen
then click on the icon bar as normal. Dedicated mode will be re-entered and
the screen will be drawn in synch with the plotting. If you are in desktop
mode when plotting completes, !Julia will automatically display the
completed screen by opening a full screen window.
Background plotting allows you to carry on using other desktop applications,
though you will notice some reduction in speed (Nb. entering commands such
as *BASIC will halt all desktop operations!). Background plotting will take
much longer, so if you leave the machine it is best to re-enter dedicated
mode by clicking on the icon bar to re-open the Julia window.
FACTORS: leads to a submenu which displays and allows entry of the variables
that are used to create the Julia plot.
XY : shows the X and Y values of each corner of the screen.
These can only be modified by Zooming.
Levels : the number of iterations before stopping each calculation.
Higher numbers will take longer but show more detail at higher
magnifications. Values >256 will cause colour wrap around.
cReal &
cImaginary: constants used as part of the Julia calculation.
Varying these alters the form of the Julia image.
DISPLAY: leads to a submenu allowing alteration of the current displayed
image.
Hide : closes the full screen window. It may be re-opened by
clicking on the iconbar.
Invert : Inverts the colours used for the display. This can improve
looks. Selecting invert again restores the colours.
B&W : converts the display to Black & White. This will show how the
image will look if printed.
Grey : converts the display to 12 grey levels, which can produce a
better printed image than B&W. Use Invert before grey to
change the order of grey tones.
Cycle : Simulates animation by continuous cycling of the colour by 1,
except for black which is left unchanged.
To change the direction use Invert prior to animation.
The mouse buttons whilst in animation operate as follows:
Select: pause the animation
Menu : end the animation
Adjust: re-start after a pause
Animation works best where there are spirals of colours -
it can be quite an hypnotic effect!
Previous : restores the previous image, ie. to the state before the last
image alteration (except Invert).
Initial : restores the display to the initial Julia set.
SAVE: allows the current Julia image and parameters to be saved as a sprite.
The name of the sprite can be over typed before selecting. The default value
of <JuliaS$Dir> is the directory in which !Julia resides. You can change
this by editing the !Run file within !Julia. A "Save As" icon is not
presented since this would be of little use in full screen mode.
!Julia sprites are totally compatible with !Paint, !Draw etc. They contain
additional information however to allow them to be re-used within !Julia.
Thus you can save a position and carry on examination some time later. To
reload a Julia sprite simply drag it onto the !Julia icon - a full screen
window will be opened to display the image.
Note that !Julia sprites are saved in Mode 13 format though they are
displayed in Mode 15 for desktop ease of use. !Julia sprites use the AFG1
sprite format for storing parameter information : contact AFG for further
details on AFG1.
QUIT: Exits !Julia. No warning is given if a redraw is in progress our if
you have not saved the current position.
Background Operation Notes
--------------------------
Background redraw is automatically cancelled if any of the image alteration
menu options are selected, or if a new sprite is loaded. The normal way to
stop a re-draw is to select Previous.
Changing any of the Julia factors during re-draw will have immediate effect.
Resuming A Plot
---------------
A saved Julia sprite can be used as the new starting point for investigation
by simply dragging it's filer icon onto the !Julia icon. Only !Julia sprites
are accepted.
Julia Algorithm
---------------
The routine used to calculate the image is as follows:
iter=0
finished=FALSE
xSq=x*x
ySq=y*y
do
iter=iter+1
y=x*y
y=y+y-cImaginary
x=xSq-ySq-cReal
xSq=x*x
ySq=y*y
distanceSq=xSq+ySq
if distanceSq>=4 then finished=TRUE
while (iterno<MaxIt AND NOT finished)
if finished=TRUE then colour=iterno
else colour=0
where x and y are calculated for each pixel displayed, and MaxIt is the
maximum iterations before plotting. Note the use of inverse colours. These
are plotted directly to the screen (ie. the physical colours) and are
plotted this way for better effect. This algorithm was taken from the
excellent book: Dynamical Systems & Fractals by Becker & D�rfler, CUP.
Programming
-----------
!Julia is written in C except for the integer plot routines and colour cycle
(JuliaAsm) which are in ARM assembler for maximum speed. Contact me if you
would like to know how to call JuliaAsm and use it within your own programs.
The cycling routine comes from !AFGSprite.
History
-------
1.00 April 1991 : Created and released for AFG launch within 2 weeks.
1.10 May 1991 : Added cycling routine for coffee table browsers!
To come (a wish list):
Load a sprite from the menu.
Automatically update the save sprite name on a numerical basis.
Compressed sprite files.
Direct input of X & Y values.
Batch operation - ie. create a text file of co-ordinates, feed it into
!Julia, go to sleep, then come back to find loads of nice sprites on your
disk (this will definitely require sprite compression).
Many more image manipulation facilities.
A faster floating point routine (the speed difference is embarassing!).
I may consider a background integer routine, but I am the lucky owner of an
ARM-3 which does the integer plot in under 30 seconds, 6 seconds flat out!
Final Boring Copywright Notice
==============================
The copywright of this material belongs to Mike Curnow except for the !Help
application which belongs to J R�ling. This software may be passed on to
others as long as NO CHARGES ARE LEVIED except to cover costs.
Archimedes Fractal Group (AFG)
==============================
This software is part of the Archimedes Fractal Group collection. If you
have obtained this software outside of the AFG and would like to find out
more about Fractals on the Archimedes, contact me (the AFG administrator) at
the address below. Send a SAE and a disk to get a free AFG demo disk.
Mike Curnow,
30 Bowen Drive,
West Dulwich,
London
SE21 8PN
<<<< MAY THE CHAOS BE WITH YOU! >>>>
00000000 20 20 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f | ______________| 00000010 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f |________________| * 00000040 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 0a 20 2f 20 20 20 |__________. / | 00000050 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00000090 20 20 20 20 20 5c 0a 7c 20 20 20 20 20 20 20 20 | \.| | 000000a0 20 20 20 20 20 20 20 20 21 4a 55 4c 49 41 20 76 | !JULIA v| 000000b0 31 2e 31 30 3a 20 51 75 61 64 72 61 74 69 63 20 |1.10: Quadratic | 000000c0 4a 75 6c 69 61 20 50 6c 6f 74 74 65 72 20 20 20 |Julia Plotter | 000000d0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000000e0 20 20 7c 0a 7c 20 20 20 20 20 20 20 20 20 20 20 | |.| | 000000f0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000100 20 20 20 31 38 20 4d 61 79 20 31 39 39 31 20 20 | 18 May 1991 | 00000110 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000120 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 7c | || 00000130 0a 7c 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |.| | 00000140 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000150 62 79 20 4d 69 6b 65 20 43 75 72 6e 6f 77 20 20 |by Mike Curnow | 00000160 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000170 20 20 20 20 20 20 20 20 20 20 20 20 7c 0a 20 5c | |. \| 00000180 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f |________________| * 000001c0 5f 5f 5f 5f 5f 5f 5f 5f 2f 20 0a 0a 49 6e 74 72 |________/ ..Intr| 000001d0 6f 64 75 63 74 69 6f 6e 0a 3d 3d 3d 3d 3d 3d 3d |oduction.=======| 000001e0 3d 3d 3d 3d 3d 0a 21 4a 75 6c 69 61 20 69 73 20 |=====.!Julia is | 000001f0 61 20 66 61 73 74 20 64 65 73 6b 74 6f 70 20 4a |a fast desktop J| 00000200 75 6c 69 61 20 70 6c 6f 74 74 65 72 20 74 68 61 |ulia plotter tha| 00000210 74 20 70 72 6f 76 69 64 65 73 20 76 69 72 74 75 |t provides virtu| 00000220 61 6c 6c 79 20 75 6e 6c 69 6d 69 74 65 64 0a 65 |ally unlimited.e| 00000230 78 70 6c 6f 72 61 74 69 6f 6e 20 6f 66 20 74 68 |xploration of th| 00000240 65 20 71 75 61 64 72 61 74 69 63 20 4a 75 6c 69 |e quadratic Juli| 00000250 61 20 73 65 74 2e 20 49 74 20 70 72 6f 76 69 64 |a set. It provid| 00000260 65 73 20 66 75 6c 6c 20 7a 6f 6f 6d 69 6e 67 2c |es full zooming,| 00000270 20 72 65 73 74 61 72 74 0a 61 6e 64 20 63 6f 6c | restart.and col| 00000280 6f 75 72 69 6e 67 20 66 61 63 69 6c 69 74 69 65 |ouring facilitie| 00000290 73 2c 20 61 6e 64 20 6d 75 6c 74 69 2d 74 61 73 |s, and multi-tas| 000002a0 6b 73 20 77 68 65 72 65 20 61 70 70 72 6f 70 72 |ks where appropr| 000002b0 69 61 74 65 2e 20 49 74 20 75 73 65 73 20 66 61 |iate. It uses fa| 000002c0 73 74 0a 69 6e 74 65 67 65 72 20 61 72 69 74 68 |st.integer arith| 000002d0 6d 65 74 69 63 20 74 6f 20 6d 61 67 6e 69 66 69 |metic to magnifi| 000002e0 63 61 74 69 6f 6e 73 20 6f 66 20 61 72 6f 75 6e |cations of aroun| 000002f0 64 20 36 30 2c 30 30 30 2c 20 74 68 65 6e 20 73 |d 60,000, then s| 00000300 77 69 74 63 68 65 73 20 74 6f 0a 66 6c 6f 61 74 |witches to.float| 00000310 69 6e 67 20 70 6f 69 6e 74 20 74 68 65 72 65 20 |ing point there | 00000320 6f 6e 2e 20 54 68 65 20 4a 75 6c 69 61 20 69 6d |on. The Julia im| 00000330 61 67 65 20 69 73 20 64 69 73 70 6c 61 79 65 64 |age is displayed| 00000340 20 69 6e 20 32 35 36 20 63 6f 6c 6f 75 72 73 2e | in 256 colours.| 00000350 0a 0a 41 20 62 72 69 65 66 20 67 75 69 64 65 20 |..A brief guide | 00000360 74 6f 20 75 73 61 67 65 2e 0a 2d 2d 2d 2d 2d 2d |to usage..------| 00000370 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------| 00000380 0a 44 6f 75 62 6c 65 20 63 6c 69 63 6b 20 6f 6e |.Double click on| 00000390 20 74 68 65 20 66 69 6c 65 72 20 69 63 6f 6e 2c | the filer icon,| 000003a0 20 74 68 65 6e 20 63 6c 69 63 6b 20 6f 6e 20 74 | then click on t| 000003b0 68 65 20 69 63 6f 6e 2d 62 61 72 20 69 63 6f 6e |he icon-bar icon| 000003c0 20 74 6f 20 64 69 73 70 6c 61 79 0a 74 68 65 20 | to display.the | 000003d0 69 6e 69 74 69 61 6c 20 4a 75 6c 69 61 20 73 65 |initial Julia se| 000003e0 74 2e 20 50 72 65 73 73 20 4d 65 6e 75 20 61 6e |t. Press Menu an| 000003f0 64 20 74 68 65 6e 20 73 65 6c 65 63 74 20 5a 6f |d then select Zo| 00000400 6f 6d 2e 20 55 73 65 20 74 68 65 20 6c 65 66 74 |om. Use the left| 00000410 20 6d 6f 75 73 65 0a 62 75 74 74 6f 6e 20 74 6f | mouse.button to| 00000420 20 7a 6f 6f 6d 20 69 6e 2c 20 61 6e 64 20 74 68 | zoom in, and th| 00000430 65 20 6d 69 64 64 6c 65 20 62 75 74 74 6f 6e 20 |e middle button | 00000440 74 6f 20 7a 6f 6f 6d 20 6f 75 74 2e 20 50 72 65 |to zoom out. Pre| 00000450 73 73 20 74 68 65 20 72 69 67 68 74 20 62 75 74 |ss the right but| 00000460 74 6f 6e 0a 74 6f 20 73 74 61 72 74 20 74 68 65 |ton.to start the| 00000470 20 72 65 64 72 61 77 20 6f 70 65 72 61 74 69 6f | redraw operatio| 00000480 6e 2e 20 41 74 20 6c 6f 77 20 6d 61 67 6e 69 66 |n. At low magnif| 00000490 69 63 61 74 69 6f 6e 73 20 74 68 65 20 6d 61 63 |ications the mac| 000004a0 68 69 6e 65 20 77 69 6c 6c 20 62 65 0a 6c 6f 63 |hine will be.loc| 000004b0 6b 65 64 20 75 6e 74 69 6c 20 74 68 65 20 72 65 |ked until the re| 000004c0 64 72 61 77 20 69 73 20 63 6f 6d 70 6c 65 74 65 |draw is complete| 000004d0 20 28 75 73 75 61 6c 6c 79 20 6c 65 73 73 20 74 | (usually less t| 000004e0 68 61 6e 20 33 20 6d 69 6e 75 74 65 73 29 2e 0a |han 3 minutes)..| 000004f0 0a 41 74 20 68 69 67 68 20 6d 61 67 6e 69 66 69 |.At high magnifi| 00000500 63 61 74 69 6f 6e 73 20 28 79 6f 75 20 77 69 6c |cations (you wil| 00000510 6c 20 6e 6f 74 69 63 65 20 74 68 65 20 64 72 61 |l notice the dra| 00000520 6d 61 74 69 63 20 73 70 65 65 64 20 64 65 63 72 |matic speed decr| 00000530 65 61 73 65 29 20 79 6f 75 20 63 61 6e 0a 72 65 |ease) you can.re| 00000540 74 75 72 6e 20 74 6f 20 74 68 65 20 64 65 73 6b |turn to the desk| 00000550 74 6f 70 20 77 68 69 6c 65 20 70 6c 6f 74 74 69 |top while plotti| 00000560 6e 67 20 63 6f 6e 74 69 6e 75 65 73 2c 20 62 79 |ng continues, by| 00000570 20 70 72 65 73 73 69 6e 67 20 4d 65 6e 75 20 74 | pressing Menu t| 00000580 77 69 63 65 20 61 6e 64 0a 73 65 6c 65 63 74 69 |wice and.selecti| 00000590 6e 67 20 48 69 64 65 2e 0a 0a 54 68 65 20 44 69 |ng Hide...The Di| 000005a0 73 70 6c 61 79 20 6d 65 6e 75 20 6f 70 74 69 6f |splay menu optio| 000005b0 6e 20 67 69 76 65 73 20 61 63 63 65 73 73 20 74 |n gives access t| 000005c0 6f 20 70 72 65 76 69 6f 75 73 20 69 6d 61 67 65 |o previous image| 000005d0 73 20 61 6e 64 20 76 61 72 69 6f 75 73 20 63 6f |s and various co| 000005e0 6c 6f 75 72 0a 6d 6f 64 69 66 69 63 61 74 69 6f |lour.modificatio| 000005f0 6e 73 2c 20 77 68 69 6c 73 74 20 48 69 64 65 20 |ns, whilst Hide | 00000600 74 65 6d 70 6f 72 61 72 69 6c 79 20 63 6c 6f 73 |temporarily clos| 00000610 65 73 20 74 68 65 20 77 69 6e 64 6f 77 2e 20 4e |es the window. N| 00000620 6f 74 65 20 68 6f 77 65 76 65 72 20 74 68 61 74 |ote however that| 00000630 0a 77 68 65 6e 20 69 6e 20 66 75 6c 6c 20 73 63 |.when in full sc| 00000640 72 65 65 6e 20 6d 6f 64 65 20 74 68 61 74 20 74 |reen mode that t| 00000650 68 65 20 64 65 73 6b 74 6f 70 20 69 73 20 73 74 |he desktop is st| 00000660 69 6c 6c 20 61 63 74 69 76 65 20 2d 20 69 74 73 |ill active - its| 00000670 20 6a 75 73 74 20 74 68 61 74 0a 74 68 65 20 6f | just that.the o| 00000680 74 68 65 72 20 77 69 6e 64 6f 77 73 20 61 72 65 |ther windows are| 00000690 20 68 69 64 64 65 6e 2e 0a 0a 54 68 65 20 73 63 | hidden...The sc| 000006a0 72 65 65 6e 20 63 61 6e 20 62 65 20 73 61 76 65 |reen can be save| 000006b0 64 20 62 79 20 75 73 69 6e 67 20 74 68 65 20 53 |d by using the S| 000006c0 61 76 65 20 6f 70 74 69 6f 6e 2e 20 53 61 76 65 |ave option. Save| 000006d0 64 20 64 72 61 77 69 6e 67 73 20 6d 61 79 20 62 |d drawings may b| 000006e0 65 0a 72 65 6c 6f 61 64 65 64 20 62 79 20 73 69 |e.reloaded by si| 000006f0 6d 70 6c 79 20 64 72 61 67 67 69 6e 67 20 74 68 |mply dragging th| 00000700 65 20 73 61 76 65 64 20 73 70 72 69 74 65 20 6f |e saved sprite o| 00000710 6e 74 6f 20 74 68 65 20 21 4a 75 6c 69 61 20 69 |nto the !Julia i| 00000720 63 6f 6e 2c 20 61 6c 6c 6f 77 69 6e 67 0a 7a 6f |con, allowing.zo| 00000730 6f 6d 69 6e 67 20 74 6f 20 72 65 2d 63 6f 6d 6d |oming to re-comm| 00000740 65 6e 63 65 2e 0a 0a 46 75 6c 6c 20 4f 70 65 72 |ence...Full Oper| 00000750 61 74 69 6f 6e 20 49 6e 66 6f 72 6d 61 74 69 6f |ation Informatio| 00000760 6e 0a 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d |n.==============| 00000770 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 0a 21 4a 75 |============.!Ju| 00000780 6c 69 61 20 72 65 71 75 69 72 65 73 20 61 20 63 |lia requires a c| 00000790 6f 6e 73 69 64 65 72 61 62 6c 65 20 61 6d 6f 75 |onsiderable amou| 000007a0 6e 74 20 6f 66 20 73 74 6f 72 61 67 65 20 3a 20 |nt of storage : | 000007b0 33 30 30 6b 20 66 6f 72 20 69 74 73 65 6c 66 2c |300k for itself,| 000007c0 20 31 36 30 6b 20 66 6f 72 0a 61 20 4d 6f 64 65 | 160k for.a Mode| 000007d0 20 31 35 20 73 63 72 65 65 6e 20 61 6e 64 20 36 | 15 screen and 6| 000007e0 30 6b 20 66 6f 72 20 74 68 65 20 73 68 61 72 65 |0k for the share| 000007f0 64 20 43 20 6c 69 62 72 61 72 79 2c 20 73 6f 20 |d C library, so | 00000800 62 65 20 70 72 65 70 61 72 65 64 2e 20 54 68 65 |be prepared. The| 00000810 20 4a 75 6c 69 61 0a 70 6c 6f 74 20 69 73 20 64 | Julia.plot is d| 00000820 69 73 70 6c 61 79 65 64 20 61 73 20 61 20 66 75 |isplayed as a fu| 00000830 6c 6c 20 73 63 72 65 65 6e 20 77 69 6e 64 6f 77 |ll screen window| 00000840 20 77 68 69 63 68 20 6d 61 79 20 62 65 20 68 69 | which may be hi| 00000850 64 64 65 6e 20 61 74 20 61 6e 79 20 74 69 6d 65 |dden at any time| 00000860 20 62 79 0a 73 65 6c 65 63 74 69 6e 67 20 48 69 | by.selecting Hi| 00000870 64 65 20 66 72 6f 6d 20 74 68 65 20 6d 65 6e 75 |de from the menu| 00000880 2e 0a 0a 41 75 74 6f 6d 61 74 69 63 20 4c 61 73 |...Automatic Las| 00000890 74 20 44 69 73 70 6c 61 79 20 53 61 76 65 0a 2d |t Display Save.-| 000008a0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------| 000008b0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 41 6c 6c 20 6f |----------.All o| 000008c0 70 65 72 61 74 69 6f 6e 73 20 77 68 69 63 68 20 |perations which | 000008d0 6d 6f 64 69 66 79 20 74 68 65 20 4a 75 6c 69 61 |modify the Julia| 000008e0 20 69 6d 61 67 65 20 77 69 6c 6c 20 73 61 76 65 | image will save| 000008f0 20 74 68 65 20 63 75 72 72 65 6e 74 20 64 69 73 | the current dis| 00000900 70 6c 61 79 20 69 6e 0a 6d 65 6d 6f 72 79 2c 20 |play in.memory, | 00000910 65 78 63 65 70 74 20 66 6f 72 20 49 6e 76 65 72 |except for Inver| 00000920 74 20 77 68 69 63 68 20 69 73 20 73 65 6c 66 20 |t which is self | 00000930 63 61 6e 63 65 6c 6c 69 6e 67 2e 20 54 68 65 20 |cancelling. The | 00000940 70 72 69 6f 72 20 69 6d 61 67 65 20 6d 61 79 20 |prior image may | 00000950 62 65 0a 72 65 63 61 6c 6c 65 64 20 62 79 20 73 |be.recalled by s| 00000960 65 6c 65 63 74 69 6e 67 20 50 72 65 76 69 6f 75 |electing Previou| 00000970 73 20 66 72 6f 6d 20 74 68 65 20 6d 65 6e 75 2e |s from the menu.| 00000980 20 54 68 75 73 20 79 6f 75 20 63 61 6e 20 7a 6f | Thus you can zo| 00000990 6f 6d 20 69 6e 20 74 6f 0a 69 6e 73 70 65 63 74 |om in to.inspect| 000009a0 20 61 6e 20 61 72 65 61 2c 20 74 68 65 6e 20 71 | an area, then q| 000009b0 75 69 63 6b 6c 79 20 62 61 63 6b 20 6f 75 74 20 |uickly back out | 000009c0 74 6f 20 74 68 65 20 70 72 65 76 69 6f 75 73 20 |to the previous | 000009d0 64 69 73 70 6c 61 79 2e 20 54 6f 20 6d 61 69 6e |display. To main| 000009e0 74 61 69 6e 0a 66 75 72 74 68 65 72 20 69 6d 61 |tain.further ima| 000009f0 67 65 73 20 75 73 65 20 74 68 65 20 6c 6f 61 64 |ges use the load| 00000a00 20 61 6e 64 20 73 61 76 65 20 66 61 63 69 6c 69 | and save facili| 00000a10 74 69 65 73 2e 0a 0a 54 68 65 20 4d 65 6e 75 20 |ties...The Menu | 00000a20 4f 70 74 69 6f 6e 73 0a 2d 2d 2d 2d 2d 2d 2d 2d |Options.--------| 00000a30 2d 2d 2d 2d 2d 2d 2d 2d 0a 54 68 65 20 6d 65 6e |--------.The men| 00000a40 75 20 6f 70 74 69 6f 6e 73 20 61 72 65 20 61 76 |u options are av| 00000a50 61 69 6c 61 62 6c 65 20 66 72 6f 6d 20 74 68 65 |ailable from the| 00000a60 20 69 63 6f 6e 20 62 61 72 20 6f 72 20 66 72 6f | icon bar or fro| 00000a70 6d 20 74 68 65 20 66 75 6c 6c 20 73 63 72 65 65 |m the full scree| 00000a80 6e 0a 77 69 6e 64 6f 77 2e 20 41 6c 6c 20 6f 70 |n.window. All op| 00000a90 74 69 6f 6e 73 20 65 78 63 65 70 74 20 5a 6f 6f |tions except Zoo| 00000aa0 6d 20 61 6e 64 20 48 69 64 65 20 77 69 6c 6c 20 |m and Hide will | 00000ab0 77 6f 72 6b 20 66 72 6f 6d 20 74 68 65 20 69 63 |work from the ic| 00000ac0 6f 6e 20 62 61 72 2c 20 74 68 6f 75 67 68 0a 6f |on bar, though.o| 00000ad0 62 76 69 6f 75 73 6c 79 20 79 6f 75 20 77 69 6c |bviously you wil| 00000ae0 6c 20 6e 6f 74 20 73 65 65 20 63 6f 6c 6f 75 72 |l not see colour| 00000af0 20 65 66 66 65 63 74 73 20 75 6e 74 69 6c 20 79 | effects until y| 00000b00 6f 75 20 6f 70 65 6e 20 74 68 65 20 77 69 6e 64 |ou open the wind| 00000b10 6f 77 2e 0a 50 72 65 73 73 69 6e 67 20 41 64 6a |ow..Pressing Adj| 00000b20 75 73 74 20 69 6e 73 74 65 61 64 20 6f 66 20 53 |ust instead of S| 00000b30 65 6c 65 63 74 20 77 69 6c 6c 20 6b 65 65 70 20 |elect will keep | 00000b40 74 68 65 20 6d 65 6e 75 20 6f 70 65 6e 2e 0a 0a |the menu open...| 00000b50 5a 4f 4f 4d 3a 20 41 63 74 69 76 61 74 65 73 20 |ZOOM: Activates | 00000b60 74 68 65 20 7a 6f 6f 6d 20 62 6f 78 20 61 6e 64 |the zoom box and| 00000b70 20 72 65 2d 70 6c 6f 74 74 69 6e 67 20 70 72 6f | re-plotting pro| 00000b80 63 65 73 73 2e 20 4d 6f 76 69 6e 67 20 74 68 65 |cess. 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