From a photo of Rev. 0 board 1070 (A2S1-0800), near locations D11, 12, 13 and 14.SN74LS161N, 7738K date code. Rounded notch.Total # on board: 4.
Parts for my Rev 0 replica.SN74LS161N, 7706Q date code. Squared-off notch. NOS.