1. Find an older RCA remote or buy a universal (they are inexpensive often). Magnavox/Philips have a few nice one and there is the ONE FOR ALL/Radio Shack variety (RS are often OFA rebranded, as far as I know).
2. Use that VCR you probably still use to watch VHS and put the Xbox on the LINE channel (that's basically what '00' corresponds to) and then you can feed the TV with channel 3 or 4 depending on what may be in use in your area. For the most part, low VHF television signals will disappear in the US after 02/17/2009, the currently scheduled DTV switchover date.*
3. The mark "ColorTrak" has an over 3 decade old association with RCA color TV going back to the 1970s. The "PLUS" could be as old as 15-20 years. Digital tuning became more common toward the early 80s, cable ready tuning worked it's way down from more expensive models to budget sets by 1985 across the industry as by that time cable was new in many places and well established in a few others.
RCA itself was bought by Thomsen Electronics of France along with the GE TV and consumer electronics lines (appliances remained with GE) in 1985 or '86 and that is why GE owns NBC Universal today, not RCA. I know GE sets had a box on back with the manuals inside, maybe your set has similar? Still, if you want to find the original or compatible RCA remote you need the model and it's on the tag in back most likely. A manual, especially the service manual might have shortcuts or workarounds to reset the set. 00 may only be accessable when using the CABLE tuning setting...changing may clear memory presets and facilitate reprogramming or channel setup.
At this point it's not a hard deal, but maybe the VCR would be better? You have to use the RCA jacks to use the VCR...or use a modulator.
*NOTE: Stations within 50 miles of Mexico are probably not going to be required to switch for up to five years under the current scenario as we do not have a legally binding treaty with non-DTV Mexico yet. Canadian authorities have not mandation any transitions to digital broadcasting for AM/FM or TV and in the case of Digital Audio Broadcasting (DAB) they chose a new band.
Only FULL POWER TV stations will be required to elsewhere, leaving LP, CA (Class A) and translators able to use NTSC as before for an indeterminate time. Congress is eploring ways to help fund the expensive changeover for small and multiple signal operator that are typical in these cases.
You will have to convert if you do not have cable or satellite to receive DTV off the air and will require a converter with ANALOG PASSTHROUGH (passes NTSC through so you can watch) in that case.
My house is a stereo orphanage or something and I built the three room TV/FM antenna based network and the phones and the LAN line to the bedroom. What's a girlfriend?