PASTI200M The SC242 was later used for AMD's Slot A as well, and while the two slots were identical mechanically, they were electrically incompatible. The form factor used for Slot 1 was a 5-inch-long, 242-contact edge connector named SC242. The Single Edge Contact Cartridge, or "SECC", was used at the beginning of the Slot 1-era for Pentium II CPUs. Inside the cartridge, the CPU itself is enclosed in a hybrid plastic and metal case.|The Do's and Don'ts Of Slot Wins 2024