@hmjswt Ha! I remember doing FORTRAN on punch cards. Do I win on age score?
You might be interested in a rocket graphically modeled in QB64, say to hit targets?
For font size in output, is it possible you are using screen 0 (default) and your code is running past the bottom of the screen?
Because when it does it flips to _FONT 8 automatically and I don't like that size either!
You have to control that by specifying _FONT 16 or changing number of rows... all kinds of work arounds if that is what is happening.
The way to test is simple PRINT "Hello World" program, run that and if font is bigger than font you are seeing in your program, your program is printing past bottom of screen and switching to _FONT 8
Now if you have "normal" font 16 in output as seen in PRINT "Hello World" program, you can load a larger font for output. Fellippe has gone over with video.
Update: well _FONT 16 won't stop _FONT 8 evoking!
So just make sure you aren't LOCATEing below line 25 in default screen.