TI99Sim is a very good emulator of Texas Instruments TI99 home
computer running on Windows and Unix.
The emulator faithfully imitates the TI99/4 model
PSPTI99 is a port on PSP of the version 0.1.0 of TI99Sim.
How to use it ? Everything is in the README.txt file.
Sources are included, and this package is under the GNU public licence,
read COPYING.txt file for more information about it.
You can download it on my blog :
If you want to convert games etc ... have a look to Ti99/sim web site
for more informations (http://www.mrousseau.org/programs/ti99sim/).