I have to say that having GFA Basic on the Atari ST as my first real development language made a huge difference, given that it had code blocks, functions, local variables, typed variables, arrays and record types and built-in commands for OS calls, memory access, matrix operations and a ton of other stuff. Made moving to Turbo Pascal relatively easy.

http://www.geocities.ws/slaszcz/mup/prgnames.html

https://github.com/ggnkua/Atari_ST_Sources/blob/master/GFA%2...