Lear Siegler ADM-3A

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Lear Siegler ADM-3A
Lear Siegler ADM-3A-1.jpg
Manufacturer Lear Siegler
Model ADM-3A
Introduced July, 1976
Introductory Price $1,045
Interfaces RS-232C,
20mA current loop,
Baud Rates 75, 110, 150, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200
Size 12-inch
Phosphors P4 white, P4 green
Refresh Rates 60 Hz, 50 Hz
Character Modes
Resolution 80x24
Matrix 5x7

The Lear Siegler ADM-3A terminal is an expanded version of the ADM-3 terminal. It was introduced in July, 1976 at a price of $1045. The ADM-3A added direct cursor addressing.[1] By 1981, the price had been reduced to $595.[2]

A graphics option was available in May, 1982 at a price of $1,050.[3]

The terminal was created by Dennis J. Cagan and 3 other engineers at LSI. In 1975, these engineers left Lear Siegler to form Soroc Technology. The first product from Soroc was a design similar to the ADM-3A, which was sold to Beehive as the Beehive B100 in 1976-1977.[4]




  1. "Lear Siegler Upgrades ADM-1, Gives ADM-3 Full Cursor Ability", Computerworld, July 5, 1976, pg. 16
  2. Lear Siegler advertisement, Computerworld, August 17, 1981, pg. In Depth/10
  3. Communications at NCC, Lear Siegler, Inc., Computerworld, May 31, 1982, pg. 47
  4. "Lear-Siegler Terminal". http://www.old-computers.com/site/header/terminal.asp. Retrieved March 15, 2012.