Visicalc? I recall using a PROLOG interpreter on a Kaypro II under CP/M. Worked neat. Also i used an ALGOL-60 compiler. In fact, just a subset of ALGOL-60. So

Visicalc? I recall using a PROLOG interpreter on a Kaypro II under CP/M. Worked neat. Also i used an ALGOL-60 compiler. In fact, just a subset of ALGOL-60. So, in some ways, a limited subset of a subset of Pascal.