Bios9821rom Better -

The original bios9821rom likely uses "Plug and Play ISA" settings that require manual jumper configuration. A better version introduces ACPI (Advanced Configuration and Power Interface) 1.0b.

With ACPI enabled:

A better BIOS expands the list of recognized CPUs, RAM modules, and storage drives. bios9821rom better

The original bios9821rom likely only supported Mendocino or Katmai core CPUs. If you have upgraded to a Pentium III Coppermine (500Mhz – 1.13Ghz) or a Tualatin (using a slotket adapter), the old BIOS will display "Unsupported CPU" or lock the multiplier. The original bios9821rom likely uses "Plug and Play

A better, updated bios9821rom includes:

After a successful flash, a "better" ROM will load its new defaults. You must clear the CMOS (using the jumper or removing the battery for 10 minutes). Do not skip this. Old configuration data in the CMOS ram will corrupt the new microcode tables. The original bios9821rom likely only supported Mendocino or