I read somewhere else in this group that it is the same as the C7.

I tried the to redirect keys, put extended codes on keys, learnig from the original remote and macros. It took all.

David B had a post about the memory limit of 180 steps where extended code/redirect key takes 4 steps and a key in a macro taks one step. I ran out of memory when I counted about 172 steps.

The IR learning memory is separate. It can learn 15 to 30 keys (I need to learn 13 and did not reach the limit).

There is a long thread in this forum with 120+ posts "Amazing Discovery: 15-1994 Radio Shack's new 6-in-1 Remote" started by Andre. Print it out and it will give you all the info you need (or addresses to the info).

Zhe Zhang