[micheljansen]

This makes me so excited. I grew up just after the BASIC era and my first computer was a 486 running MS-DOS (without a BASIC interpreter), so my introduction to programming came quite late. I had endless fun tinkering around in a commercial product called DIV Games Studio [1]. It included a very simple language with everything from parallel game loops to video modes, in an IDE with a debugger, sprite editor etc. You could even compile your games to DOS executables for distribution. Apparently people are still keeping the project alive and are making games with it: http://div-arena.co.uk/games/

[1] https://es.wikipedia.org/wiki/DIV_Games_Studio

[sd8dgf8ds8g8dsg]

MS-DOS shipped with QBASIC.

https://en.wikipedia.org/wiki/QBasic#History

[Roboprog]

Or GW-BASIC, for people and computers of a certain age.