Pegasus Basic v4.0 by Juli, 1989 - This is a really cool extension to BASIC. It's cool because it not only adds a bunch of graphics related commands, it also adds many utility type commands.  On top of that, it has some nice improvements to the basic editor. There are a half dozen sample programs included on the disk and an English translation of the manual (Blame me if there are any inaccuracies, I ran it through the DeepL translator, then went back and transposed some wording).

Big thank you to a couple of our visitors (BlueCursor & Markus), for pointing me in the direction of the source of this fine extension (and sharing an additional English translation of the manual), which is the February 1991 issue of Magic Disk 64.  Here is a link to a nice site that has all the Magic Disk textual content converted to HTML.