The Sound Blaster is a series of sound cards from Create Labs. For a time, the Sound Blaster was considered a de-facto standard for DOS based gaming. Initially it competed against the uncommon IBM Music Feature card, and the Adlib cards. The original sound blaster provided 8-bit mono digital sound in addition to Adlib-compatible FM music synthesis and stereo CMS Game Blaster compatible square-wave music. Most DOS games work best with the earlier ISA cards. Later PCI cards use completely different hardware and only provide Sound Blaster compatiblity through software emulation.