The problem is: there is no a group of jumpers combination available for the details voltage regulation on my motherboard, just a single 3 pins with only 1 jumper. And a simple kind of specification mentioned on its manual:

Microprocessor Voltage (J5K1)
This jumper block changes the output of the on-board voltage regulator. Pins 1-2 should be jumpered for processors that require the VRE specification. Pins 2-3 should be jumpered processors that require standard voltage regulation. Some upgrade processors might require a different setting. Check the processor's documentation for the correct setting. Refer to the Pentium Processor Specification Update to determine the voltage requirements for the processor you are using.

My CPU on that rig is a Pentium 100Mhz with VRE setting on the voltage jumper, and I wanna replace it with a Pentium MMX 133mhz or 166mhz to build up a powerful 3-in-1 DOS rig, but I've got no idea about whether the jumper should be jumped into VRE or standard voltage....

So what is VRE? Is VRE supported by P-MMX 133/166 or not? Jumper should be placed as standard voltage or VRE voltage for P-MMX series CPU?