Please note that the file:
Texas Instruments TI-99/4A user reference guide PDF
is (C) by CaDD Electronics. It is our version of the 99/4A URG, and should not be distributed without our permission. CaDD has permission from TI to create custom versions and distribute them with our products. In addition, the version you are offering is very much out of date.
It would be appreciated if yo would find an alternate -- non-CaDD -- source for this material.