An interesting type of logic is DEC DTL "flip chip" technology, use in the original PDP-8. It uses all PNP bipolar transistors. It's always interesting how th

An interesting type of logic is DEC DTL "flip chip" technology, use in the original PDP-8. It uses all PNP bipolar transistors. It's always interesting how they make flip-flops. In this case, the slave side is the typical latch made out of cross-connected inverters. The master side uses a diode-capacitor-diode gate. A capacitor follows the input signal. A pulse on the clock line transfers the charge to the slave latch. http://bitsavers.trailing-edge.com/pdf/dec/handbooks/Digital_Logic_Handbook_1967.pdf http://bitsavers.trailing-edge.com/pdf/dec/handbooks/Digital...