Old computers sill in use

[wb5mmb]

Hi all, a question. What is the oldest computer (PC,MAC, Apple II, 
TRS 80) you have seen lately that is still in commercial use (not in 
an AMRADers basement). I was at my self storage place today and their 
gate is still controlled by a TRS80-100. It reads 2 keypads for pin 
numbers opens and closes the gate and prints a time stamped log on a 
thermal printer. It came out in 1983 (while looking up this date I 
ran across this page http://www.club100.org/index.html).
      Sandy
      WB5MMB