TI-85

Doomsday Horizons 85
Archives and news of everything related to the development of the Doomsday Horizons 85 Operating System, based on the TI-85 and the E2.
http://dh85.ticalc.org/

Extended Precision Arithmetic on the TI-85
A simple system for long integer mathematical operations on the TI-85.
http://www.geocities.com/Hollywood/2979/explore1.htm

The ZShell School
One of the most popular tutorials for z80 assembly programming for the TI-85.
http://www.acc.umu.se/~yarin/zshell.html