Based on code from Dincer Aydin http://www.geocities.com/dinceraydin
Below you see a visual bitmap calculator that lets you draw a character, then copy and paste the list of bitmap values into your own program. This is a great tool that will make defining custom characters and making animations a breeze. It's written in Javascript, so it should run on any modern browser. If it doesn't run, you may have Javascript disabled in your preferences.
This applett was created specifically to help with the "Mere Mortal Video Game Driver" written by Terry Hitt for the SX 28.
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=137918