In addition to this ftp.whtech.com site there are two other 
internet sites that have significant TI99/4A related 
material.

The TI99/4A Home Computer Page http://www.99er.net has 
links to everything on the web that has anything to do with 
the TI 99/4A home computer.

At the Cadd Electronics page 
http://pw2.netcom.com/~mjmw/index.html you can find 
information on how to purchase fully licensed user manuals 
in pdf format for any offiial TI command module or disk 
software.  This is software that has a PHD (disk) or PHM 
(command module) number.  You can also purchase from Cadd 
fully licensed images of TI command modules or disks for 
use with their PC99 emulator.

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Additional: 

These are the most active online forums for the 4/a and Geneve (and other TI stuff like the 99000 and cc-40)
TI-99/4A Computers http://ti99.atariage.com
TI-99/4A Development http://dev99.atariage.com

Need a power supply? ram expansion? Carts? new games? www.arcadeshopper.com