Welcome to Joe's Projects!
Here you will find my various electronic design and hardware hacking
projects. Please click on the links to your left or read below.
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view my YouTube Channel
You can build a simple pressure mat using an aluminum foil and paper
towel capacitor. With this Arduino sketch it can triggle a Halloween
After thinking about building a relay-computer for a while, I started
focusing on the flip-flop design and came up with idea for a master-slave
flip-flop with a capacitor-based latch for the master side and a hold
resistor based latch for the slave side. Of course I wanted to try it, so I
designed a 4-bit counter...
Long ago I tried to start a business and wanted to accept credit card
transactions, so I leased a credit card terminal from CardService
International. The business went nowhere, but I leased this
machine long enough so that eventually I came to own it. I'm sure it
cost me at least $1500 in lease payments...
Delay line memory always fascinated me. It is well known that early
computers such as the UNIVAC-I
used mercury acoustic delay line memory. Less well known is that the
use of digital delay line memory continued well into the semiconductor era
in the form of Torsional
and Quartz delay line memories for calculators...
This started out as a check on some performance problems which were fixed
for the latest version of JOE (version 4.3), but is interesting in its own
right as a comparison between some text editors...
MPL is a PL/I-like language for Motorola's 8-bit
M6800 development system, the
Motorola Exorciser (running MDOS). I assume it's Motorola's answer to PL/M for
Intel's 8080 microprocessor. The language seems to have been created before 1976.
It's fun to pretend it's 1978 and try to write some programs with this