infobox computer
Photo =
Developer = Lear Siegler

The ADM-3A is one of the first computer terminals manufactured by Lear Siegler. It had a 12 inch screen displaying 12 or 24 lines of 80 characters.


Originally priced at $1195, a DIY kit later sold for $995. At first only allowing capital letters as ADM-3; the model was quickly supplanted by the more advanced version with both lower case, and uppercase. Further optional Add-ons included a graphics card enabling it to emulate a Tektronix 4014 and an extension port which would allow daisy chaining several ADM-3As on a single RS-232 line. The setup was controlled by 32 DIP switches under the nameplate at the front of the machine, beside the keyboard, including speed from 75 to 19200 bit/s (although all speeds above 9600 were purely theoretical, as it could accommodate such speeds only if the actual incoming characters were coming at a much slower rate to accommodate its buffer, otherwise data would be lost). The advanced configuration options allowed split speed connection, sending at one rate, and receiving at another.


The 5x7 dot matrix characters were displayed in amber, green phosphorus or white on black (the cursor was 7x9). The keyboard had 59 keys.

See also

*HJKL keys

External links

* [ Lear Siegler ADM 3A]
* [,5618 Tenth Anniversary ADM 3A Dumb Terminal Video Display Terminal User's Reference Manual]
* cite web
title=Lear Siegler, Inc. (LSI) Terminal ADM3A

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