Specifications

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U12 SN74LS14N (Motorola) or MB74LS14M (Fujitsu) or HD74LS14P (Hitachi)
U13 SN74LS32N (Motorola) or MB74LS32M (Fujitsu) or HD74LS32P (Hitachi)
U20 SN74LS32N (Motorola) or MB74LS32M (Fujitsu) or HD74LS32P (Hitachi)