i took my previously modded bioses and applied the v4.23 rom.by bios patcher to add (later than palomino) athlon xp cpu microcode and fix bus disconnect support. i also selected show actual xp frequencies, but the post screen still reports 2100+ so either it didn't take or the fix refers to another location. i successfully flashed both bioses, but i don't have any later 266fsb cpus to test the new microcode.

here we go again...i've since switched from ps/2 to a usb keyboard and discovered that the default rom.by rollback feature (original bios loaded when '-' keypress or keyboard disconnected) doesn't recognize the usb keyboard legacy support on this board. i re-patched with the /s switch to permanently modify the bios with no rollback option.