1964 PAT on IBM 1620 1966 APL\360 1968 APL\1130 1973 SCAMP Prototype 1974 APL 5100, MCM/70 1977 APL/S for VideoBrain 1979 APL\11 (perhaps earlier) for Unix v7 (written in C language) 1979 APLSF for PDP-20 runs under TOPS-20 1981 MicroAPL for SuperPET 1983 APL/PC version 1 for IBM PC DOS) 1984 APL-80 for TRS-80 Model III, written by Phelps Gates 1987 APL/Z for Altair Z80 CP/M 1989 APL2/6000 for IBM RISC System 6000 1990 APL.68000 for Amiga, Atari ST, etc 1992 port of APL\11 to Linux by Michael Cain 1997 IBM APL2 for Windows 1998 OpenAPL derived from APL\11 by Branko Bratkovic 1999 Amiga port of APL\11 1999 Sharp (Soliton) APL for Linux 2013 GNU APL