I'm a Texas Instruments graphing calculator programmer, specifically for the 83+ series, but also for the 73, 86 and partly 89.
My ticalc.org author profile and the Detached Solutions home page have a little more information about me and the calculator community.
You can also find random stuff in the /calcstuff/ directory of this site.
Various projects I'm working on:
- OS2 - a replacement operating system for the TI-73, 83 Plus/SE, and 84 Plus/SE. The SVN repository can be found here.
- periph8x - TI-84 Plus/Silver Edition USB keyboard/mass storage peripheral driver
- print8x - TI-84 Plus/Silver Edition USB printer driver
- Time8x - TI-84 Plus/Silver Edition Timex USB Data Link watch driver
- wifi8x - TI-84 Plus/Silver Edition USB wireless ethernet driver
Here are some random things I've discovered or created and that might be of some help. I make no guarantee on its accuracy or completeness, though.
- Click here for a list of page 0 calls and their functions on OS 2.41. It's mostly a cross reference of the B_CALL addresses from here and the page 0 call table. It can be helpful in disassembling.
- The mystery of MirageOS' Save the Whales has finally been solved. Check out the solution and the proof.
- Don't forget the BCALL of the Day!
- LinkMan, one of many ways to put an unsigned third-party OS on your 84+/SE as well as a general link port-related manager.
- The most complete public ti83plus.inc file to date.
- Oncalc USB printing built into the 84+/SE OS?
- All of Texas Instruments' cryptographic signing keys.
Alex Forencich developed a power circuit for the 84+(SE)/89Ti USB port to make a cable that can break the 100mA power limit they currently have (no pun intended). It gets the power instead from a 9V battery. I built this circuit and can verify it works, but I made several part substitutions so that all the parts can be bought from Radio Shack.
Below is Alex's original power circuit (click for bigger image):
D2 can be substituted with another 1N914 diode, Q1 can be substituted with the 2N2222 NPN transistor, and Q2 can be substituted with the 2N3906 PNP transistor. You'll also (naturally) need mini-A male and A female USB cables to splice. One end of the unit-to-unit USB cable that comes with the 84+(SE) and likely 89Ti will work for the mini-A male part.
A complete list of parts (as best I could match off radioshack.com) is below:
| Part Number | Description | Quantity | Price |
|---|---|---|---|
| 276-1604 | PNP Amplifying Transistors (15-Pack) | 1 | $2.59 |
| 276-1617 | NPN Transistors (15-Pack) | 1 | $2.59 |
| 276-1770 | +5V Fixed-Voltage Regulator 7805 | 1 | $1.59 |
| 276-1122 | 1N914/4148-Type Diode | 1 | $1.39 |
| 271-1321 | 1K Ohm 1/4-Watt Carbon Film Resistor5 Pack | 1 | $0.99 |
| 271-1311 | 100 ohm 1/4W 5% Carbon Film Resistor pk/5 | 1 | $0.99 |
| 271-1335 | 10K Ohm 1/4-Watt Carbon Film Resistor5 Pack | 1 | $0.99 |
| 271-1315 | 330 ohm 1/4W 5% Carbon Film Resistor pk/5 | 1 | $0.99 |
| Total Price: $12.12 | |||
You can probably buy these parts for far less elsewhere, but if you're in the middle of nowhere, this should be the highest it'll ever get.
Here is a picture of the completed circuit, prettied up as much as possible:
