Our Experiment

A couple of months ago, we undertook what I consider a pretty fascinating project, although Kenn at the time described it as "geeky". We took 2 Celeron Socket-370 to Slot-1 converters, now lovingly known as "slockets", and modified them to allow dual-processing. This was done by way of some moderately difficult soldering. The main problem with modifying the Celeron for dual CPU operation lies in two things. The primary modification is connecting BR1#, which is on the CPU, to B75 of the Slot-1 pins. PII's already have this connection, but Celerons don't. This seems to be a deliberate move by Intel to disable Celerons for SMP operation. This ominous task can be avoided with the slocket, however, because the modification can be made on the slocket instead of having to touch anything on the CPU. On the slocket, you have to connect pin AN15 of the CPU-contact pins to the same B75 of the Slot-1 pins.

  

Some slockets end the modification here. The MSI slockets that we dealt with previously worked after the modification. Others, like the Abit slocket, need one other touch. Again, it seems that Intel deliberately made a change to hinder the Celeron's multiprocessing ability, because BR1# is set to the wrong voltage. You have to up the voltage to 1.5V to get the correct voltage. By adding a 56 ohm resistor and connecting it via insulated wires to both the A15 pin on the slocket and the B5 Slot-1 pin, we were able to get establish the proper voltage.