1. FOrmula CALCulator. An interaCtive system written by RiCk Merrill of DEC in 1969 for PDP-5 and PDP-8. It was a desCendant of AID/JOSS. Versions: FOCAL-69, FOCAL-1971, FOCAL-11 (for PDP-11 under RT-11). (1994-12-21) 2. Forty-One CAlCulator Language. The programming language of the HP-41 CalCulator line. (1994-12-21)