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The patterns are read using a Z80 Sharp MZ computer (MZ-80K?) from 1979. Nice This channel (Byte Attic) have a restoration video: https://www.youtube.com/watch

• masswerk 3y ago
  It's definitely a Sharp MZ-80K. https://www.old-computers.com/museum/computer.asp?c=174 https://www.old-computers.com/museum/computer.asp?c=174 https://en.wikipedia.org/wiki/Sharp_MZ https://en.wikipedia.org/wiki/Sharp_MZ Edit, regarding the video: It should be mentioned that the parts found in late 1970s and early 1980s computers were usually of quite good quality (things like capacitors were also more expensive then) and modern parts are not necessarily better or more reliable. "Shotgunning" all capacitors doesn't necessarily improve things. E.g., mine works perfectly fine without changing a single part. This particular machine, shown in the video, was in a bit of a rough state, though.