Hi, I would be really gratefull if you could tell me where you obtained the code for the PIC so that I could have a look through it. >From what I understand it`s not I2C but uses similar hardware, i,e pullups two data lines etc. That is why there is a bit of software you can get for the calc that allows you to interface to i2c IC`s, with no external hardware. I do have the interface specs, I hooked up a simple circuit to test the way I thought it should work and to cut a long story short it dosn`t. I can`t really find any good source of information, you would think TI would publish it. >From: Alan B Pearce >Reply-To: pic microcontroller discussion list >To: PICLIST@MITVMA.MIT.EDU >Subject: Re: Interfacing TI calc to PIC >Date: Tue, 25 Apr 2000 18:14:17 +0100 > >I recently purchased a TI83 as part of the support requirements for a >course I >am doing. I set about looking for what was available on the web about these >and >came up with several sites just by entering "TI83" on yahoo. It is claimed >that >the interface on the jack plug is I2C, but disassembling the code from a >simple >16C84 device that connects it to a serial line for connecting to a PC >program >suggests it is not true I2C > >If you want further info Andrew, I will look out the info. I assume it is >one of >this family of calcs you are talking of. ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com