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GF5.HLP
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1990-12-18
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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!