TI-92 Interesting Information

All items with no name were created by me.

In the manual, there is a typo at the bottom of page 103. Look at the screen capture. A "g" and "h" were confused.
In the Data editor, press F5 to show the calc menu, then press Esc. Then 2nd-Quit to return to the home screen, and then APPS 6 1 to go back to the Data editor. The cursor should be on row 255, and you have to press 2nd-Up several times to get back to the top. This is a bug. It occurrs on ROM version 1.7, and maybe others. (To check your ROM version, go to the Program I/O screen, and press diamond-open parenthesis. Then press 2nd-Quit.)
The geometry application takes about 25K free memory to run. Also, it generates about 10 invisible temporary variables. To prove their existence, do a Receive from the TI-92 Windows TI-Graph Link software. It will count up the number of variables on the calc, and there will be about 10 more than if you weren't in geometry.
In the Mode dialog box, if settings are changed, the current application is redrawn on the screen. If ESC is pressed to cancel the changes, then the application is not redrawn. But if changes are made, and then changed right back in the dialog box, without leaving, and then ENTER is pressed, the application is still not redrawn. This means that the TI-92 compares each mode setting to see if it has changed.
There is an interesting but harmless bug when you restore a backup with the TI-Graph Link software. If the current folder on the sent backup is not MAIN, the current folder will be shown correctly in the MODE dialog box, but the status bar will say MAIN in the lower left corner. Changing the current folder corrects the status bar info.
With the TI-Graph Link software, you can copy the TI-92's current LCD image. While the image is being retrieved, press 2nd, diamond, hand, or shift very quickly and repeatedly. When the image is shown on the computer screen, some of the pixels from the modifier key indicator on the status bar will be showing, and others will not, making it look screwed up.
Major annoyance: In the text editor, if 2nd-ENTER is pressed when there is something in the home screen history, the last entry replaces whatever the user is typing. So if I'm typing a long paragraph, and accidentally press 2nd-ENTER instead of ENTER when I'm done, it will all be cleared and replaced with the last entry, and there is no way to undo it.
The TI-92 stores symbolic, "exact" values differently than decimal numbers. The list {1,2,3,4,5} takes 19 bytes, but the list {1.1,2.2,3.3,4.4,5.5} takes 54 bytes. The same numbers in symbolic form, {11/10,11/5,33/10,22/5,11/2} takes only 29 bytes. All decimal numbers take the same amount of space to store. With the decimal number list, space could be saved by converting the list to a string for storage, or by using the exact() function to change the decimals to fractions. Submitted by Martin Knowles
The TI-92's GUI can display dialog boxes. It can even display multiple dialog boxes at a time. For example, in VAR-LINK, press F2. There are now two dialog boxes on the screen. Here's a challenge: Can you get four dialog boxes on the screen? There are many ways to do it. The Answer
Version 1.4 and earlier only: If a custom toolbar is displayed in a program while the Graph application is active in Full Screen mode, pressing ESC or selecting any item hides the toolbar, leaving the screen empty where it was. Submitted by Ed Fry
It is possible to display not only four, but FIVE dialog boxes on the TI-92 simultaneously! Try to figure out how. If you think you've got the solution, then read The Answer to Displaying 5 Dialog Boxes. You might also want to look at this hint if you're stumped. Before you attempt this, though, try to figure out how to display four dialog boxes (see the item above).

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