Zida Tomato BIOSes for Slot 1
Slot 1 (242 pin) refers to the physical and electrical specification for the connector used by some of Intel's microprocessors, including the Pentium Pro, Celeron, Pentium II and the Pentium III. Both single and dual processor configurations were implemented. Intel switched back to the traditional socket interface with Socket 370 in 1999.
See: https://en.wikipedia.org/wiki/Slot_1.