noyzelab has a couple of posts up on the Hinton ML 1890 & ML 1820. See each link for more pics, links & audio demos.
The ML 1890: "This module is pretty special having a logic buss at the rear for the 8 switches which I can interface directly to my MANIAC & Arthur prototype systems. This makes them particularly handy for being modulated by Cellular Automata logic patterns. The ML1890 can switch both audio and control voltages and was built by Graham Hinton back in the mid 70's ! The inputs are duplicated to nuclear physics spec Lemo connectors which connect to the virtual earth inputs on the module, allowing input signals to be summed directly on the Pin Matrix module."The ML 1820: "This module is also has a logic buss at the rear for the 8 counter bits, which I can interface directly to my MANIAC & Arthur prototype systems. This makes them particularly handy for being modulated by Cellular Automata logic patterns. The ML1820 was built by Graham Hinton back in the mid 70's using wire wrapping!"
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