RC2014 Build: Dual Clock Module

In this series of videos I'll be assembling an RC2014 Pro, a Z80 based microcomputer available for purchase online. I received this as a Christmas gift from Mrs B, after giving her some significant hints as to what I'd like. The RC2014 is a brilliant design IMHO, and will be used by me as the foundation for many of my Z80-based hardware and software experiments. In this video I'm building the second module, a dual clock board. This provides the heartbeat of the computer, a square wave clock signal that synchronises the Z80 and its peripherals. Link to RC2014 website: https://rc2014.co.uk/ Link to this build's BOM here: https://rc2014.co.uk/modules/dual-clock-module/ NB: At 57:32 in the video I spot three unpopulated holes under U4. I asked Spencer (the designer of the RC2014) on Twitter what they were for, and he replied: "Those will give you other clock speeds. They don't produce common baud rates, though, so they're unlikely to be useful. But they're kind of accessible in case anybody does need them". Chapters: 00:00 Intro 01:53 Modifying the dual row header 06:50 Soldering the dual row header 09:38 Soldering the chip sockets 12:03 Soldering the external clock module header 15:09 Soldering the clock frequency selection header pins 22:49 Soldering the reset switch and remaining header pins 26:55 Identifying resistors using a multimeter 30:29 Soldering the resistors 33:38 Identifying the capacitors, diode, and crystal 34:35 Electrolytic capacitor polarity 36:05 Diode polarity 39:30 Soldering the crystal 41:22 Soldering the capacitors 57:32 Mystery component holes under U4 58:44 Socketing the logic chips 66:25 Outro