Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!clyde!uunet!dino!ux1.cso.uiuc.edu!iuvax!silver!harlanp
From: harlanp@silver.bacs.indiana.edu (P.C. Harlan)
Newsgroups: comp.sys.mac.hardware
Subject: Re: ADB Extended Keyboard Problem
Summary: Common problem
Keywords: ADB Extended Keyboard Garbage
Message-ID: <30905@iuvax.cs.indiana.edu>
Date: 5 Dec 89 23:11:27 GMT
References: <6521@tank.uchicago.edu> <2338@jato.Jpl.Nasa.Gov>
Sender: root@iuvax.cs.indiana.edu
Reply-To: harlanp@silver.bacs.indiana.edu (P.C. Harlan)
Organization: Indiana University, Bloomington
Lines: 37

carmi@mars.UUCP (Aviram Carmi) writes:
| rer3@tank.uchicago.edu (richard elliot robbins) writes:
| +I recently purchased an Apple Extended keyboard for my Mac II.
| +The keyboard seems to work well in general, however, when I
| +type certain characters rapidly garbage is consistently generated.
| +For example, when typing the three letters "omp" the following
| +characters are generated "om0-p;,"  This happens consistently and
   [...]
| 
| I have encountered exactly the same problem that you are describing.
   [...]
| It also generates the same garbage characters when typing "o,p".
| (And "ou;" instead of "out", but that's less frequent.)
| I have not tried any other key combinations, but since
| the "," and the "M" keys are next to each other, I would assume
| some problem with the contacts in the keyboard and not in the software
| (inits, system, etc.); I am using a MacII 6.02 and lots of inits.

This is a problem I asked abou; [sic -- this happens a LOT] a month or
so ago, and someone emailed me that the keyboard contains a lot of
diodes to prevent signals from getting crossed.  If you want to save
money (and you don't care about quality), you leave out some diodes.

I have gotten the same "ou;" problem on every one of the 4 or so ADB
keyboards I have used, extended or not, and I am NOT hitting the ";"
key.

Whether diodes or internal bumping, it is irritating nonetheless and I
would return the keyboard if the warranty hadn't (quickly) run out :-(.

I am surprised that more people haven't noticed this problem, since as
far as my meager but random sampling goes, 100% of the keyboards have
this problem.

P.C. Harlan
Indiana University
harlanp@silver.ucs.indiana.edu