The 9312PC is a monolithic, high speed, 8-input digital multiplexer with Multi-function capability, On-Chip select logic decoding and Fully buffered complementary outputs. PDIP-16 Package. This chip is used on many arcade and pinball game PCBs. These chips of ours are brand new NOS chips and not some used/fake chips like other vendors i have seen are selling. This 9312PC MUX TTL chip can replace any of the following part numbers: 9312DC, 93L12DC, 93L12PC, 93S12PC, 29312, 39312 and 93S12DC.