RetroSys2019 CPU Board

The first “real” board for the RetroSys2019 system is the Z80 CPU board. Compared to older/other designs it has some specifics :

  1. A DIL crystal oscillator. In the past I had quite some issues with crystals mixed with modern TTL creating unstable clock signals. A DIL crystal oscillator will fix this and when using a socket at the same time gives the opportunity to play with the clock speed without soldering.
  2. Fully buffered bus. Which not only buffers the CPU signals (increasing the fan-out) but also giving the opportunity to put the CPU board in “Tri-State” , making the bus available for another processor, e.g. an Arduino to write the memory.
  3. A decent (TL7705) reset signal generator.

The board as it appears in Kicad (Non-Rendered and Rendered versions) :

RetroSys2019 CPU Kicad Gerber
RetroSys2019 CPU Kicad
RetroSys2019 CPU Kicad 3D view front (Non-Rendered)
RetroSys2019 CPU Kicad 3D view back (Non-Rendered)
RetroSys2019 CPU Kicad 3D view front (Rendered)
RetroSys2019 CPU Kicad 3D view front (Rendered)

DISCLAIMER : Please note that these boards have only been designed VERY recently . They are currently being manufactured and I will post progress in my blog.

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