Simons' Basic

Simons' Basic was an extension to Commodore BASIC 2.0 for the Commodore 64. Simons' Basic added an additional 114 commands for programming. It was written by a 16-year old British programmer named David Simons in 1983, then distributed by Commodore in Cartridge format.

Features
Simons' Basic added an extra 114 programming keywords to Commodore BASIC 2.0. The extra commands in this program included assistance in sprites, music & SFX, high-resolution and multicolour graphics, along with commands put in to aid with structured programming. When started up, a screen would display saying: *** EXPANDED CBM V2 BASIC *** 30719 BASIC BYTES FREE READY.

Misspelling
This program is also well (but incorrectly) known as Simon's Basic, which was misprinted on the earlier versions of the cartridge. The misspelling of "Simon's" is due to the confusion between the first name 'Simon' and the surname 'Simons'.