DFI 486-OCV Plus User Manual page 16

Pentium OverDrive Ready System Board
TM
Jumper JP23
High Speed Mode for VL-Bus Board
Set Jumper JP23 to Off only if the VESA VL-Bus
add-on board installed in the VL-Bus slots support Zero
Wait State. If you are not sure that your add-on
board(s) support Zero Wait State, set JP23 to On;
otherwise, a system error may occur.
On: One Wait State
Jumper JP24
CPU Speed for VL-Bus Board
If a VL-Bus board is installed in the 486-OCV Plus
system board, Jumper JP24 must be set to On if the
CPU speed is greater than 33MHz. If the CPU speed is
less than or equal to 33MHz, set JP24 to Off.
CPU Speed > 33MHz
2-9 u Installation Overview
Off: Zero Wait State
On
CPU Speed <= 33MHz
Off