Trouble Shooting:
Where do I find the Xmin, Xmax,Ymin,or Ymax variables on my TI-83?
You can find them by pushing the VARS button on the keypad, then select the WINDOW submenu.
Are there any other ways to read TI source code from the files on the internet?
You can download the TI-GRAPH LINK Software from the TI web page, you can use this to view *.83p , *.86p , *.83g , etc..., type program files you find on the web. TI changed around they're web page, so there may be added tricks to get through. You can find the software at:
http://education.ti.com/us/product/accessory/connectivity/down/download.html
How do I make a program edit-locked, so it can not be edited anymore after programming? And how do you make files unlocked?
You can use the TI-GRAPH LINK Software(use the link above) to turn on and off this option, but it won't be of much help if you don't have the Link Cable to connect your calculator to your computer.
I'm totaly new at this, how do I begin?
To begin, push the PRGM key, push the left arrow key until NEW is highlighted and select Create New. It will then ask you for the Program name, you can enter anything you want that is up to 8 letters long. Then it will take you to the code screen.
Each line starts with a ':'. To enter code you can find the keywords under the Catalog menu (push 2nd and the zero key). For the special variables (e.g. Xmin, Xmax) you can look them up under the variable menu (push the VARS key)(e.g. the Xmin would be found by pushing VARS and selecting the Window submenu). The aphabet letters A-Z can be used by pushing Alpha and the corresponding green letter on the keypad. The -> symbol can be found by pressing the key above the ON button(it looks like STO->). The sybols /=, <=, and >=, can be found under the TEST menu by pushing 2nd and MATH, these sybols represent 'not equal to','less than or equal to', and 'greater than or equal to' respectively.
I'm having trouble finding the Commands
All of the code that is writen out in words ( such as for(, Xmax,If,End ) are special commands that you need to pull out of a list. the other things that appear by themselves can usually be punched in streight from the keypad. Words inside of parenthesis need to be typed in manually using the ALPHA key and the corresponding letter. The special commands I refered to earlier can be found under the CATALOG or the VAR menu's. To get to the catalog( it has most of what you need) push the 2nd(the yellow one) key and the zero key on the TI-83 or the CUSTOM key on the TI-86. On the zero key the word catalog should be in yellow letters. The VARS menu has some of the special variables that the calculator has a specific purpose for. Such as Xmin, which sets the minimum X limit for the graph window. The Vars Menu can be reached by pushing the key left of the CLEAR key. The variables such as Xmax, Ymin, etc... can be found under the WINDOW submenu in the VARS menu on the TI-83. On the 86 the Xmin variables can be found can be reached by pressing 2nd and CUSTOM and selecting either REAL or WINDOW.
What is a Syntax Error?
To put bluntly, a sytax error is when the processor has no clue what your doing. A common sytnax error is in miss using the minus signs with the negative signs. The negative sign(left of the Enter Key) does not require a value before it. If you use the minus sign insted , it will try to do subtraction with an incomplete statement. Sytax errors also can be just a form of bad punctuation.
What is an Arguement Error?
An argument error is when the function you give the calculator, such as for( ), does not have the correct number of parameters. The function for( ) needs 3 parameters. The first being the variable, the second is the initial value, and the third is the ending value. If you're getting this error, be sure you have all your comma's in place.
What is an Domain Error?
A Domain Error will happen if you are outputing something to a place that doesn't exist, such as displaying words off the screen. The common form of this error is when the order of the coordinates are reversed. In the graph mode the system is the basic (X,Y), with an exception to the pixel test function that works by (rows,columns). The Home Screen coordinates also go by (rows, columns).
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