2532 Roms are hard to find and the programmer able to program these is even harder to find. I think Ken has done this successfully in the past. I will be doing a few S&T boards in the next few months, so I can write up a guide.
There is not a lot of info on the S&T boards - Even Clay does not go into great depth in his guides.
Maybe this document would be a starting point ?
http://marvin3m.com/bally/squawk.htm