It was nearly 20 years ago so I hope I am right. In the DOS days the programs were written to work with specific sound cards, so I may have mispoke when I called it a driver. I recall that the 16-bit card had the older native hardware on it for backward compatibility with older software, maybe not specifically so that it would work in an 8-bit slot. There was a small DOS .com file that initialized the card for the IRQs since the 16-bit version is jumperless. Once that was done DOS programs designed to do so could directly access the card. There was a huge difference in sound quality when I put that card in a 16-bit ISA system with Windows.
Also, it is not Sound Blaster compatible so the number of DOS programs were limited.