Circa 1983? Chances are it's BP2. When I was a high school senior in 1978, I wrote a BP2 decompiler for an Independent Study project, so BASIC-PLUS-2 had been around for quite some time by 1983. I got some of my first exposure to computers through Project DELTA (hi, Rich!!), and was fascinated by PPCODE. I still have a source listing at home on a VERY faded length of Teletype paper. -- Tony