AA is an Extended Basic version of Alien Attack. (not included /MagerValp).
Alien is an assembly version of AA. The program loads from the Editor
Assembler, option #5, Run Program File.
Use the arrow keys ('S' and 'D') to move the base, the '.' (period)
key to fire. High flying aliens are worth 100 points, low flying are
50. You have 60 seconds, and there is a high-score feature.
Both are V9T9 format files.
You can get the emulator from ftp.whtech.com/v9t9
Texas Instruments TI99/4a
I never managed to run the TI99 games, so there's only so much I can
write here... Try the forum on the compo page if you have any trouble.
This page seems to be the best source for information out there:
http://www.99er.net/emul.shtml