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74LS00 / 74LS00N replacement chip, DIP-14, quadruple 2-Input positive-NAND gate used in arcade games and pinball machine repair.
SN74LS161 / 74ls161AN replacement chip. DIP 16, 4-Bit Synchronous Binary Counter.
SN74LS244 replacement chip. DIP-20, Octal Buffers and Line Drivers With 3-State Outputs
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