Harold, That makes sense. In fact after I wrote my last message I was=20 sitting here thinking and I remembered that we were time sharing on an=20 IBM 370/70. So it would only be natural for the teletype machine to be=20 an IBM. Ah, I now know what the make is. If only I could remember the=20 model. Oh, well. Thanks, rich! On 3/16/2015 9:55 PM, Harold Hallikainen wrote: > I suspect "golf ball" printers were derivatives of the IBM Selectric > typewriter. Those were mechanically amazing. > > Harold > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .