Tyan S1854 Trinity 400 Motherboard

I have a Tyan S1854 Trinity 400. It has two processor sockets, a Socket1, which is a Pentium 3 500mhz and I’m not sure what the other one is, but I believe it houses a 1ghz processor.
My question is, does anyone know the socket number of the 1ghz processor. the deal is you can only run one processor, not both. thank you