Repeating from my earlier response. The CIT220 keyboard is NOT compatible with the VT220's. You'd have to wire up a patch adapter. I don't remember who I sold my CIT220 to last year and I could not find a picture to show that the keyboard adapters are different. Bill
On Wed, Jan 7, 2026 at 1:55 PM Richard via cctalk <[email protected]> wrote: > > In article <[email protected]> you write: > >I inherited a C. Itoh CIT-220 with no keyboard. Is the keyboard model- > >or C. Itoh-specific or will other keyboards work with it? > > 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>
