Developer: Paul Slocum

Paul Slocum is a musician and programmer who uses old hardware in his music and art. His Atari 2600 homebrew Synthcart, from 2002 and sold through the AtariAge store, turns the console into a small synthesizer with an arpeggiator and a beat box of 33 preset rhythms. It is played with two Atari keypad controllers, which the browser emulator does not support, so here you can see its display but not play notes. Slocum also made Cynthcart, a synth for the Commodore 64.
Open it below in your browser to see how it looks.