Malay Cannon of the 17th & 18th Century
Cannon such as these were being manufactured nearly one hundred years before the arrival of Europeans to this part of the world. It is believed that gun making was introduced to the region by Muslim traders from the Middle East.
The cannon are smooth bore and muzzle loading. They were used as weapons of war and also signalled the start and end to fasts during the period of Ramadan. The firing of cannons was also used by royalty to announce a royal birth or wedding.
Sources :
http://www.fortsiloso.com/museum/malay.htm