The software NewPen, that is available for free from
allows you to use Graffiti on your Treo 90/270. When you enable the software (by clicking on the options button 3 times) you can write on the screen. On the left side you type the letters on the right side special characters and numbers. it works flawlessly on my Treo 270 and it is free!!!!

The best software for your Treo!!