46....
First BASIC program - Interact 1979
First FORTRAN program - NAS 370 1981
First Pascal program - Prime 750 1981.
First dBase program - 1987 IBM PC
First C program 1988 MS-DOS PC/XT
First SQL code 1998 Mac/PC/Sybase
Vic-20 1980-83, C-64 1983-1986, MS-DOS PC 1986-1990s Linux 1993-present Win32 1995-present.