Later, the more advanced Basics such as Basic on the PC began to use them. A good rule of thumb for a Classic Basic program is to run it, and see what it does. If if does anything graphical, makes noise, or even moves the cursor around the screen, it probably is not very portable. Quirks of my basic Most of these games have been optimized towards my own Basic interpreter, and checked against Qbasic, the MS-DOS Basic. This will account for some of the features you may notice in the programs.
Many programs treat the semicolon as a synonym for a comma.
Me, I was allways annoyed that I could not get rid of the question mark in an input statement, so allowed the second form. You guessed it, I allways found that annoying. If I want a space, I'll add it myself, thanks. My basic does not. Because I have allways used the precidence from Pascal, because that is the language I write everything in, so it is easier for me to remember.