The Treo is a great PDA but there's no access to Graffiti 2 so you can input characters via a stylus. There is a freeware application Graffiti Anywhere you can install to regain the use of Graffiti 2 which is still in your Treo.
The only difference is that "dot" tap is replaced by a Graffiti Anywhere special stroke so I modified the Graffiti 2 stroke chart below.
Some alphabet strokes can be done with lower case characters, like: a, b, d, e, g, n, r. Also the exclamation point may be more reliable if drawn between the Punctuation Shift upstrokes as seen under the Special Characters heading. You can also use this Punctuation Shift upstroke after the stroke for the letter "L" if it doesn't appear when writing. Some characters are just pesky.
For even more alternate strokes click on this link.
If you would like a higher-res jpeg version of the chart below click here.