In this fifth video in the sub-series of building a keyboard interface for the Hack Computer, I synthesize and test the keyboard circuit built in prior videos. Of course, it did not work the first time and I walk through my foibles. I also discuss electrical characteristics of the PS2 keyboard and build a 5V to 3.3V level-shift circuit to lower clock and data input voltages to levels that will not damage the FPGA.
Resources:
github.com/log...
mitpress.mit.e...
digilent.com/s...
digilent.com/s...
Many thanks for the terrific circuit simulator: falstad.com
You will need the develop branch from Logisim Evolution in order to pick up the board design for the CMOD A7, until such time as my changes make it into a Logisim release.
You will need the Vivado product from Xilinx to synthesize the design for the Digilent board. It's huge, but free (if you give your information). Sorry. I did not write it.
www.xilinx.com...
You will also need a PS2 keyboard and connector break-out of some type. I got mine at a second-hand electronics shop in Salem, OR. Shout out to Norvac Electronics: norvac-electro...
But if you want to buy one new, try: www.adafruit.c...
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29 авг 2024
