Date   : Thu, 17 May 1984 21:50:16-EDT
From   : Bradley C. Kuszmaul <KUSZMAUL@MIT-XX.ARPA>
Subject: Re: DU2 & KAYPRO

The KAYPRO probably emulates a terminal though software and a memory
mapped (character mapped not bit mapped) screen.  By going to the
direct I/O routine you probably bipassed the tab handler, discovering
a bug in the kaypro's software.
 Other systems either have a real terminal (which understands tabs)
or (as in the case of an IBM-PC) simulate a terminal, but do it correctly.

 (The above is just a guess)
 --Brad