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- This document describes a sample session with Emandel and Emdisplay.
- I ask that you read the full documentation MANDEL.DOC before
- attempting to run Emandel. Then print out a copy of this file and
- follow the step-by-step instructions for a complete "tour" of the
- highways and byways of Emandel and Emdisplay. You should also print
- out a copy of CMDS.TXT, which is a brief summary of the commands
- available in Emandel.
-
- Start Emandel by typing the following line at the DOS prompt:
-
- EMANDEL -1.7186 0.0041 -0.0041 /S.2 /B3
-
- Be sure you type the line exactly as above. When you see the word
- "Working." appear on the bottom line, press ^S (control-S). This
- will blank the screen. You can now wait for the computer to beep, to
- tell you it has finished calculating. (This will take about 9 1/2
- minutes on a 10 MHz AT clone with a math co-processor chip, but may
- take an hour or more on a slow PC without a math chip.)
-
- If you look very closely, you will see a tiny dot moving down the
- screen. This shows you the progress of the calculation.
-
- You may wish to check progress more closely from time to time before
- calculation is done. Press ^S again to restore the screen. Actually,
- in this particular picture there will be nothing to see until it is
- about 2/3 done, at which time a small speck will appear, and then
- nothing more until it is finished. This is because I have selected a
- frame with mostly low-value pixels for a quick sample session.
-
- You will know you have restored the screen, in the absence of an
- image, because the prompt line will appear, unless you have erased
- it. Now type ?t and then type ?% (letter commands may be upper case
- or lower case.) The first will tell you the elapsed time and
- (possibly) the estimated remaining time in brackets. The second will
- tell you what percentage of the frame is finished. You may press ^S
- to blank the screen again.
-
- If you are out of earshot of the computer, and you want to know if
- it has finished yet, un-blank the screen with ^S and look for the
- words "Calculation completed." in the bottom line.
-
- AFTER CALCULATION IS FINISHED THE FUN BEGINS:
-
- Unblank the screen with ^S if you have not already done so.
-
- Press ^T (control-T) to enter Threshview mode.
-
- At the "Cluster?" prompt enter A <CR>
-
- At the "Auto-draw. First cluster?" prompt press <CR>
- At the "Last cluster?" prompt again just press <CR>
- At the "Start value?" prompt enter 2 <CR>
- At the "Size?" prompt press <CR>
- At the "Gap?" prompt press <CR>
- At the "Stop value?" prompt press <CR>
-
- And before your eyes, a picture will appear. Next:
-
- At the "Cluster?" prompt enter W <CR>
-
- and the picture will be written to a file, and the prompt line will
- tell you its file name and ask you to press any key. So press any
- key and you will get the "Cluster?" prompt again. Now:
-
- Enter A <CR>
- At the "Auto-draw. First cluster?" prompt press <CR>
- At the "Last cluster?" prompt again just press <CR>
- At the "Start value?" prompt enter 2 <CR>
- At the "Size?" prompt press <CR>
- At the "Gap?" prompt enter 3 <CR>
- At the "Stop value?" prompt press <CR>
-
- A new picture will appear. Again:
-
- At the "Cluster?" prompt enter W <CR>
-
- And then press any key when you are asked to. Next:
-
- At the "Cluster?" prompt enter 100 <CR>
-
- The program will tell you that cluster 100 is clear and ask you for
- a new bottom value. Enter 25 <CR>
-
- The program will ask you for a new top value. Press the "less than"
- sign (<), which is the same as the comma key, and then <CR>
-
- And the picture will change again. At the "Cluster?" prompt enter W
- <CR> again to write this third picture to a file.
-
- Now press ESC to exit from Threshview mode.
-
- Now press ^W (control-W) to write the data to a file, in case you
- want to play with this file again before erasing it.
-
- Now press ^C (control-C) to exit from Emandel.
-
- NOW IT IS TIME TO USE EMDISPLAY
-
- Start the program Emdisplay by typing at the DOS prompt:
-
- EMDISPLAY
-
- Or, if your printer is connected to LPT2 type instead:
-
- EMDISPLAY /2
-
- NOTE: There is no point in trying to print if your printer is not
- Epson compatible, or if it is a daisy-wheel printer. But you can
- still use Emdisplay to view pictures without printing.
-
- Now the first of your pictures will show on the screen. Press the
- space bar to see the next one. Or press B to see the previous one.
- You can scroll around and around, forward or backward, as long as
- you like.
-
- If you wish to print one of the pictures, turn your printer on, put
- a sheet of paper in it, align the top of the paper with the top of
- the ribbon, and then press P. Because the pictures you just made are
- small, there will be a lot of blank paper. The picture will be
- printed in the middle of the paper with the title line at the
- bottom. (As seen after it is done. While printing it is sideways.)
-
- When you are finished, press X to exit from Emdisplay.
-
- Now you have gone through your first session with Emandel and
- Emdisplay, and you are ready to make the picture of the whole
- Mandelbrot set. You will use this one later as a guide as you
- explore its inner recesses.
-
- -------------------------------------------
-
- MAKING THE FILE "WHOLE.PIK"
-
- This one will take longer. About 40 minutes on my 10 MHz AT clone
- with a 10 MHz math co-processor chip. Perhaps all night on a slow XT
- with no math chip. So you will want to run it when the computer has
- nothing better to do.
-
- So, when you are about to go to bed, or are not going to be using
- the computer for a few hours, run the batch file WHOLE.BAT by typing
-
- WHOLE
-
- at the DOS prompt. When you see the "Working." prompt, press ^S to
- blank the screen.
-
- When you get up in the morning press ^S to un-blank the screen. If
- "Calculation completed" appears on the bottom line you may proceed
- as above to make pictures. (REMEMBER TO USE ^W TO SAVE THE DATA
- FILE. You will use this one as a basis for future sessions. See the
- instructions for Grid mode in MANDEL.DOC.) Otherwise:
-
- Press ^Q to quit calculation. ("Calculation halted" will now appear
- on the bottom line.)
-
- Press ^W to write the data file. (The bottom line will say
- "Saving..." while it writes to disk, and will say "Saved" when it is
- done.) If the frame is well-along in its calculation, this file-
- write will take some time. It is a BIG file. A full data file takes
- 15 seconds to write or read on a 28 ms. hard disk running in a fast
- AT clone. If you are using a floppy disk (*** NOT RECOMMENDED! ***)
- it may take 5 or 10 minutes.
-
- Once the file is saved, press ^C to exit the program.
-
- The data file is named WHOLE.PIK because that name was given on the
- command line (in the batch file WHOLE.BAT).
-
- When you are ready to resume work on the frame, run Emandel by
- typing at the DOS prompt:
-
- EMANDEL WHOLE
-
- Do not run the batch file WHOLE.BAT again unless you have lost
- WHOLE.PIK and want to produce it again from scratch.
-
- You can halt the program, save the data file, and then re-start the
- program as many times as you like, until it is finished. And after
- it is finished, you can re-start it again using the completed data
- file, in order to make more pictures with Threshview or to use Grid
- to create new batch files.
-
- -------------------------------------------
-
- A SAMPLE SESSION WITH GRID MODE.
-
- After WHOLE.PIK is finished, if you are not still in Emandel, run it
- with the command line:
-
- EMANDEL WHOLE
-
- And when you see "Calculation completed" on the prompt line press ^T
- to enter threshview mode.
-
- At the "Cluster?" prompt enter A <CR>
- At the "Auto-draw. First cluster?" prompt press <CR>
- At the "Last cluster?" prompt again just press <CR>
- At the "Start value?" prompt enter 7 <CR>
- At the "Size?" prompt press <CR>
- At the "Gap?" prompt press <CR>
- At the "Stop value?" prompt press <CR>
-
- The screen will re-draw. Wait for it to complete. You will now see
- the narrow "halo" that surrounds the Mandelbrot set. It is this halo
- around the set that contains all the interesting patterns you will
- want to explore.
-
- Now press ^G to enter Grid mode.
-
- Press * (the asterisk) to increase hair-line speed.
-
- Use the number pad keys to move the hairline to the region of the
- halo. Remember that the 5 key stops movement if you are in glide
- mode.
-
- Press ^B to open a grid box.
-
- Press <BS> to set motion speed to its minimum.
-
- Use the number pad keys to position the grid box onto some part of
- the halo.
-
- Press # (the crosshatch) to tell Emandel to create a batch file.
-
- At the "Enter PIK file name" prompt, enter a file name of your
- choice (it must be a valid DOS file name of 8 letters or less, and
- should not have a file type extension) or else just press <CR>
-
- At the "Maxit?" prompt enter 255.
-
- At the "Size" prompt enter 1 unless your computer's memory is
- limited or you wish to save time by using a small frame size. If you
- enter 0.25 the picture will be half the height and half the width of
- the full screen.
-
- Now the program will tell you the name of the batch file, such as
- "EMAND0.BAT". Remember this name.
-
- Now press ESC to exit from Grid mode and ESC again to exit from
- Threshview mode.
-
- IF YOU HAVE NOT ALREADY SAVED WHOLE.PIK PRESS ^W TO DO SO NOW. If
- the file WHOLE.PIK was complete before you entered Emandel this
- session, then you do not need to save it again.
-
- Press ^C to exit from Emandel. If you have not saved WHOLE.PIK,
- Emandel will tell you "file not saved. Exit?" Press Y if you already
- have a completed copy of WHOLE.PIK on disk. If you have in fact
- forgotten to save WHOLE.PIK press N. Then, when the prompt says
- "Well okay then..." press ^W and when the save is completed press ^C
- to exit from the program.
-
- When you are ready to run Emandel again, type the batch file name at
- the DOS prompt (without the "BAT" extension:)
-
- EMAND0
-
- This batch file (created in the above session) will run Emandel and
- produce the frame you marked for enlargement. The batch file will
- automatically delete itself if the program terminates without
- errors.