74157 Quad 2-Input Multiplexer

Spec Sheet
74157%20Fairch%20real%20pre NTI%20A1%20at%20C14%20b

Fairchild

From a photo of a real pre-NTI Apple-1.
74157 PC F, black plastic.
7547 date code.
Total # on board: 2. Location C14 shown.

74157%20Fairch%20real%20pre NTI%20A1%20at%20C4%20b

Fairchild

Location C4 on the same pre-NTI Apple-1 as the previous photo.

74157%20Fairch%20real%20pre NTI%20A1%20a

Fairchild

From another photo of a real pre-NTI Apple-1.
74157 PC F, black plastic. 7542 date code.

74157%2074LS157%20Sig%20real%20NTI%20A1%20at%20C14

Signetics

From a photo of a real NTI Apple-1, showing location C14.
N74LS157B. Vertical labeling, black plastic, stretched “S” logo, no added S. 7638 date code.

74157%209LS_74LS157%20Fairch%20real%20NTI%20A1%20at%20C4

Fairchild

Location C4 on the same NTI Apple-1 as the previous photo.
9LS/74LS157 F PC. Stretched, bold “F” logo. 7541 date code.

74157%20Fairch%207542

Fairchild

74157 PC F, black plastic. 7542 date code.  Exact date code and labeling match to the real Apple-1.

74157%20Fairch%207543

Fairchild

74157 PC F, black plastic. 7543 date code. Very close date code and exact labeling match to the real Apple-1.

74157%20Fairch%207653

Fairchild

F 74157PC, black plastic. 7653 date code.

74157%20Sig%2074%2075%20with%20S%2076

Signetics

Vertical labeling, black plastic, with and without added S. ’74, ’75, ’76 date codes.