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- Gear Sub-Menu F5 Detailed Help Notes
-
- "List of ... files."
- Allows the user to do a directory of files on the disk. The
- current mask is displayed which the user may change by typing
- in a new one: if the "Backspace" key is hit first then the
- string may be deleted and changed one character at a time;
- else if a normal ASCII character is struck the whole string
- will be deleted and the user may input a new string.
- The arrow keys are not implemented in editing this field.
- When the user hits "Enter" then the program will shell out
- to DOS and do a directory if there is memory available in the PC.
-
-
- "File to act on."
- This is optional and provided only as a convenience.
- It allows saving and restoring different gear combinations
- fairly quickly.
- This is the file name that this page will use to "View",
- "Read from" or "Write to". All this menu pick does is
- to change the filename. The user must then choose
- another menu pick to use the file. For example to
- "Read" the file into program memory. These files
- contain information on how many chain rings to use (1..3);
- how many gears in the rear cluster (1..9) and how the
- number of teeth of each gear and the rear wheel diameter.
- Editing this file name is the same as editing the directory
- mask above.
-
- "View"
- Allows the user to preview what is in the file before
- actually reading it into program memory or overwriting
- it.
-
- "Diameter (inches) of rear wheel."
- Enter your rear wheel diameter here. "700C" wheels are
- the same as sew ups and are approximately 26.5 inches.
- (Every one that I have and have measured but you can
- measure your particular tire and rim combination and
- enter it here!)
-
- "Chain rings(number of)"
- Tell the program how many chainrings you have. (1..3)
-
- "Smallest chain ring (# teeth)."
- If all you have is one chain ring then count the number
- of teeth on it and enter it in this menu pick. If you
- have more than enter the smallest one here.
-
- "Bigger chain ring."
- Is conditional on "Chain rings" being more than 1.
- Enter the number of teeth on the next chain ring here.
-
- "Third chain ring."
- Is conditional on "Chain rings" being 3. Enter the
- number of teeth of the largest chain ring here.
-
- "Max gears in rear cluster."
- Tells the program how many gears you have in the rear
- cluster (1..9).
-
- "1st (largest) cluster gear."
- Tells the program how many teeth this gear has.
- The program is set up to expect the largest gear
- here but you can change it around if you want.
-
- "2..." to "9.."
- are conditional on the value entered in "Max gears...".
- These menu picks tell the program how many teeth in each
- cog in the rear cluster.
-
- "Gear text table of ratios in gear inches."
- This is the same as main menu pick "F4". It displays
- to the screen in text mode to tables of sorted gear
- ratios in "gear inches". This is (an ancient) standard
- of determining (normalized) gear ratios that dates back
- to the days of the high wheeler, (Ordinary or Penny Farthing).
- In those days it was simply the diameter of the large driving
- wheel. Modern safety bicycles can be related back to the
- high wheelers by the gear inch which is equal to the number
- of teeth in the front chain ring divided by the number of
- teeth in the rear cog and multiply the result by the diameter
- of the rear wheel.
- The reason two tables are displayed is that the left most
- one if for use in figuring out what clusters to buy and how
- to customize them. The format of the charts are positionally
- sorted to easily show the shifting pattern. If they are
- printed in condensed mode then the one on the right can be
- cut apart and taped on to your bike (handlebar stem?) for
- reference. (Make sure nothing is in front of you before
- looking down and don't study it too long while riding! Keep
- an eye on the road!)
-
- "Plot ratios in gear inches"
- This is the same as main menu pick "F3". It displays
- a graphics mode plot of the same thing as above. This
- plot may be customized on F1 and F2. It should work on
- a wide variety of Graphic Display Adapters as the code
- uses Borland's Device Independent Graphics Library. It
- should work on CGA, Hercules, 8514, EGA, VGA, and AT&T
- machines! To be honest I have only tried it on EGA
- and VGA machines. Good luck on yours. Refer to the
- detailed help notes on F1, F2 and use F6, "Graphics
- hardware parameters", to find out how the program
- identifies your screen display hardware!
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