36765Re: [midatlanticretro] Tektronix Oscilloscope X-Y Art Synthesizer Demo
- Jul 3, 2014On 07/03/2014 09:50 PM, Dan Roganti ragooman@...
> I was looking at your video again and I remembered something we didSteve Ciarcia did an installment of Ciarcia's Circuit Cellar on
> back in the 70s using this method regarding computers. See, not all of
> us could afford logic analyzers while in high school, and some colleges
> couldn't even afford one. So there was this alternate way to debug the
> hardware. Basically, you took the address bus and data bus and via a
> "chip-clip", wired it to a DAC (digital to analog converter). So the
> voltages from the DAC each correspond to a memory address and the data
> bus values. And then depending on which type of test you need to check,
> you connect the voltage output from the DAC's to the X,Y or separately
> using the TimeBase. And so you get a signature pattern for each
> different test you run. This view gives you a look into how the hardware
> might be failing, if it took the wrong branch, etc, for the different
> test programs.
exactly this topic. I believe the article was entitled "Build a
Penny-Pinching Address State Analyzer". Good stuff.
Dave McGuire, AK4HZ/3
New Kensington, PA
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