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  1. I just googled for a 555 vibration circuit and...

    I just googled for a 555 vibration circuit and found https://www.electroschematics.com/6023/vibration-sensor-circuit/ . It uses a M74HC123 Monostable Multivibrator which is similar to the 555 and...
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    Thanks for the heads up. It looks like all the...

    Thanks for the heads up.
    It looks like all the Teensy family is on Amazon from various sellers. The 3.2 is Amazon's choice item. I'll order one from Echotest because I just love ordering overpriced...
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    Looks like I'm in good company. I learned 6502...

    Looks like I'm in good company. I learned 6502 assembly at Penn State since they thought the 6502 was the future at the time :). I then learned Z80 on the ZX81 and returned to 6502 on the Commodore...
  4. Awesome! I was thinking of doing something...

    Awesome! I was thinking of doing something similar but with life getting in the way I never got to it.
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    I haven't given it much thought since I've been...

    I haven't given it much thought since I've been dealing with family matters recently. I may go with a Z80 Emulator on chip. That would be easier. I am a programmer with an Electrical Engineering...
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    High Speed Interrupting

    I have been entertaining the thought of using a Teensy 3.5 as a replacement for the custom ULA IC found in the ZX81 computer. The ZX81 used the control lines of the Z80 to do the video generation...
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    You can use the 5V power output to externally...

    You can use the 5V power output to externally power a Teensy as mentioned in https://www.pjrc.com/teensy/external_power.html. If you want to connect the I/O pins of a Teensy to lines that use 5V you...
  8. At least the dimensions of the Arcade machine. I...

    At least the dimensions of the Arcade machine. I don't have a CNC machine but I do have a friend that does have that and a laser cutter and uses Fusion 360 so those files would be great to have. Does...
  9. Awesome setup!! Are you planning on posting...

    Awesome setup!! Are you planning on posting plans? I have a 19" and 21" monitor taunting me to put them in an arcade cabinet.
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    All the devices you have connected must share a...

    All the devices you have connected must share a common ground otherwise the serial port will not communicate. Between all devices the cable should have 3 conductors, transmit, receive and ground. The...
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