[6] On 1 July 1981, with a capital outlay of S$10,000,[6] Sim, along with former schoolmate Ng Kai Wa,[7] opened a computer repair shop in Pearl's Centre, in Chinatown, and founded Creative Technology.

Creative Technology subsequently began creating customised PCs adapted for the Chinese language, including enhanced audio capabilities that allowed the devices to produce speech and melodies.

[10][11] Creative Technology dominated the PC audio market until the 2000s, when OEM PCs began to be built with integrated sound boards in the motherboard.

[14] Apple countersued Creative Technology, and then launched a second suit pertaining to icons and data display and entry in such portable devices.

[26] In 1999, Sim released a book entitled Chaotic Thoughts From The Old Millennium, in which he coined and popularised the term "No U-turn syndrome" to describe the stereotypical Singaporean mindset of requiring permission from higher authorities before taking any action.