From Rosetta Code
Note: This example does not use a user-defined image type, since that would be particularly impractical, but rather draws on the calculator's graph screen, which has essentially the same operations as an implementation of Basic bitmap storage would, except for being black-and-white.

This template is for use in TI-83 BASIC and TI-89 BASIC examples whose tasks specify the use of Basic bitmap storage.

This is a template. There are many others. See Category:RCTemplates for a complete list of templates.