# Texas Instruments TI-92 Plus Graphing calculator

Type General specifications Graphing calculator 1999 - - - AMS (Advanced Mathematics Software) 32-bit MC68000 @ 10 MHz TI-GraphLink™ 46 Arithmetics Formula entry 14 digits Trigonometrics Exp and log Hyperbolics Statistics Graphing Solver Fractions Complex numbers Financial Matrices BaseN Unit conversion Constants Equation library 8.9999999817692 Features Continuous memory Flash card r/w Magnetic card r/w Printer Real-time clock Screen backlight Sound playback Sound recording Tape r/w Touchscreen
Programming model Programming Formula programming Branching Conditions Subroutines Labels Indirect addressing Formula Formula entry Memory 192 kB 192 kB 704 kB + - × ÷ Display LCD 240×120 pixels Dimensions 127×230×38 mm 566 g Power 4×AA + 1×CR-2032 -

### Description

This is realy a awesome calculator. It's realy well thought out and it took me very little effort to get going. What I like most about it is the ability to just enter equations in much the same way as you would write them on paper. I also have a HP-48, which I use a lot. But when entering large equations I always have to stop and think about how to enter the bits and pieces. On the TI-92 I just type away, and it just figures out how to get to the desired result. Fabulous!
The only slightly bad thing about it is it's size. I wouldn't like to have to carry it to school or work every day.

Real-time clock became available in OS Version 2.09.

## Performance index

Performance differs fastly depending on the settings used. In exact mode the performance index is only 9, in approximate mode it jumps to 46. The performance index was calculated using this code (-> is used for the STO-button character):
```perf()
Prgm
100->n
While n>0
10->l
While l>0
l->x
x+1->x
x-4.567E-4->x
x+70->x
x-69->x
x*7->x
x/11->x
l-1->l
EndWhile
log(x)->x
sin(x)->x
sqrt(x)->x
sqrt(x)->x
n-1->n
EndWhile
Disp x
EndPrgm
```

Execution time was 73 second when n=100. The resulting index is (34×n)/73 = 46.

## Self test / diagnostic menu

The TI-92 has an undocumented self test menu. To enter this, go to the HOME page (diamond-Q), press F5 and then press diamond and ( together.

Warning
Running the self test resets the calculator, everything is reset to factory defaults! Depending on your hardware and software version details may vary.

```Copyright © 1998 Texas Instruments, Inc
Version 2.03, 12/08/1999
```

Now press S to view the test menu:
```2.03, 12/08/1999
1) FLASH TEST
2) RAM TEST
3) KEYBOARD TEST
4) LCD TEST
5) IDD OFF TEST
6) LOW BATTERY TEST
7) HI VOLT CONTRAST TEST
8) LO VOLT CONTRAST TEST
9) OSCILLATOR TEST
0) RETURN
```

Pressing the number key corresponding to the test number invokes that test.

##### Flash test

Displays Checking BASE CODE and returns to the main menu. What it does exactly, I don't know.

##### RAM test

Displays a flashing pattern of vertical lines. Press ON to exit the test, this exits the test menu as well. All factory defaults have been restored at this point.

##### Keyboard test

Displays a pattern of black rectangles to match the position of keys on the unit. Pressing a key that corresponds with a rectangle will turn that rectangle hollow (if the key functions properly). Press the ON key last to return to the main menu. Pressing the ON key before last results in an error.

##### LCD test

```1) 1 Bit checkerboard
2) 8 Bit checkerboard
3) All ON
4) All OFF
5) Box pattern
6) Auto cycle
```

These test display various test patterns to verify the proper functioning of the display.

##### IDD OFF test

The display goes blank (empty). It might be testing the auto-off function, but I'm not sure. Pressing the ON key returns to the main menu, no other key seems to do anything.

##### Low battery test

Displays Level 3 detected on my unit. Pressing ON displays Battery Test FAILED. Pressing ON again displays Press ON to continue. Press ON again to return to the menu. My unit does not display a battery low warning, I don't know why this test failes. If you have suggestions, please drop me a line at the bottom of this page.

##### Hi volt contast test

Screen goes blank. Press any key to continue.

##### Low volt contrast test

Screen goes black. Press any key to continue.

##### Oscillator test

Displays (test takes about 5 seconds):
```Oscillator Test
DATA= 0003C932
DATA= 00000058

TEST PASSED
```

Probably tests clock oscillator, although I'm not sure. Press any key to continue.

##### Return

Exits the test menu and may do a complete reset, depending on the tests you performed. Press 2ND and ESC (QUIT) to return to the main application page if the unit does not reset automatically.

According to sources this self test also works on the TI Voyager 200.

education.ti.com - official TI-92 site
ticalc.org - excellent source of info and software for all TI models
TI-92 help - help with mathmatical problems
Turbo92 - overclocking the TI-92 to 2-4 times normal speed
ocf.berkeley.edu - TI-92 games
TI-92 Manual (Guidebook) - slow connection!

### Image

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#### 1 Responses so far

Thank you for info of the self test.
With a bit of luck you can now buy a TI-92 for a low cost online,and it is interesting the software used (Derive)was i development for 20 years.
If you have problems updating a below version 2.0 software via TI-connect remove a battery and insert it again while holding the APPs button.The TI-92 plus wil then go into recieve mode - works only for TI-92 plus.
per
April 11th, 2010