Oops after reading BCushman's post again I see that you're trying to get the Tivo remote to control the 1050. I don't think this is possible as the Tivo remote isn't a JP1 remote as far as I know (or at least, the JP1 plug visible on the 1050 remote when the battery cover is off doesn't seem to be present on the Tivo remote, but maybe you have to take the whole thing apart). And given the huge number of functions specific to the 1050, I don't think you'd be able to map the Tivo keys in any kind of satisfactory way even if it were programmable.

However, again, it is possible to teach your 1050 remote to control the Tivo.

I'll have to second RobMan here. I really like the ReplayTV box over the Tivo. I have both & now never use the Tivo. I found this thread when searching to see if a 1050 remote would be able to control my Replay box (Outlaw: feel free to add the Tivo & ReplayTV to the list of VCR remote codes!). My ReplayTV box is located in another room so hopefully I can send the commands out of the 1050 to an LED stuck on my Replay box. I'm using IR re-transmitters from Radio shack right now but they barely work because of stray RF interferance.