Yes, but you can only program a limited number of things.
To access the full power of the BC you need to remotely program it with a computer.
Once programmed you can save the patch into one of the 32 memory locations and recall it on stage to control the tx81z without a computer.
When you program patch, I always find it hard to decide what is the most usable layout of parameters for the synth I want to control.
As I recall, there were a few patches in the file section for 4 op synths.
The sysex is very similar for all of the 4op synths so even if there isn't one for the tx81z you should download some of the other 4op patches to see if any work.
To help you out with the layout you might also like to look at what I have been doing with my TQ5 (although it does involve having a computer hooked up in between)
BCR<=>TQ5 is the first version and has a short video
BCR<=>TQ5 II is the latest version of the software.