[cctalk] Re: C. Itoh CIT-220 keyboard options

In article &lt;ab1dea3f-947a-4813-8cad-b57057af2c7d(a)snowmoose.com&gt; you write: By the time we get to the VT 220 and clones, it's likely that there's a microcontroller inside the keyboard that is doing the communication with the main unit. Typically the communication is 1200 baud serial bit stream with unknown contents. I would try an LK-201 keyboard, the keyboard used with the VT 220. I am not aware of any service manual (or even a user manual!) for this terminal. If you're really paranoid about damaging either the keyboard or the terminal, you should use a voltmeter to identify which pins on the connector are power and ground and make sure that they both the keyboard you're going to try and the terminal agree on which pins are used for power and ground. The remaining pins are going to be the serial transmit and receive, likely at TTL levels not RS-232 levels. There's a possibility of damage if power and ground are misconnected but little chance of damage if it's just the receive and transmit that are misconnected. Hope that helps. Everything I know about this terminal is here: <https://terminals-wiki.org/wiki/index.php/C._Itoh_CIT-220> -- "The Direct3D Graphics Pipeline" free book <http://tinyurl.com/d3d-pipeline> The Terminals Wiki <http://terminals-wiki.org> The Computer Graphics Museum <http://computergraphicsmuseum.org> Legalize Adulthood! (my blog) <http://legalizeadulthood.wordpress.com>