[GreenKeys] Distortion Testing of my AN/FGC-25

[Don Sentz via GreenKeys]

Hi Chris,

Thank you for your feedback about the glitches. I do suspect the contacts even though I attempted to clean them during the recent lubrication and checkout. However, according to the manual TM11-2246 I should get a "burnishing tool" to use on the contacts, but I am not familiar with burnishing and I don't know what would be the proper burnishing tool for these contacts. Maybe other GreenKeyers could respond and advise me what I should get and how to use it.

This is so great to meet another original MEK6800D1 owner!  I, too, got mine when they first came out in 1975. I was 22 and in school at Ga. Tech. I was enrolled in the very first microcomputer course that Ga. Tech offered. Our textbook was still in draft form. Your dad was like my dad, financing my ham radio projects starting when I was 11.

The May 1976 issue of  BYTE magazine featured an article about "Shooting Stars" puzzle game written for Intel 8008. That summer I rewrote the program for MC6800 and my version ran on my fully populated MEK6800D1. My report is posted on Scribd.com,( https://www.scribd.com/doc/266427916/Shooting-Stars-Puzzle-Game-for-MC6800 ), but I am enclosing a copy for you with this email. You can copy/paste the object code from the report, after the MIKBUG command "L".

When you have time maybe you can describe your collections. Do you have lots of software for the 6800's? Do you still write code for them? I use the SWTPC MP-E Resident Assembler, paper tape version. I figured out how to make it work with PC or Mac as the MIKBUG console terminal.

-Happy 4th & 73
-Don
--------------------------------------------
On Sat, 7/4/15, Chris Elmquist <chrise at pobox.com> wrote:

 Subject: Re: [GreenKeys] Distortion Testing of my AN/FGC-25
 To: "Don Sentz" <dr.sentz at yahoo.com>
 Cc: "GreenKeys" <greenkeys at mailman.qth.net>
 Date: Saturday, July 4, 2015, 8:39 AM
 
 Don,
 
 What an awesome project and fabulous that you
 used an MEK6800D1 kit for
 the job!  When I
 am not collecting teletypes, I am collecting Motorola
 6800 stuff and the place is full of them
 here.  My first computer, when
 I was 14,
 was an MEK6800D1 kit that my dad got for me, just before
 that
 processor had yet been released! 
 Still have it, still runs.
 
 I will study your data and certainly respond if
 I have any ideas but I
 will likely defer to
 the TTY experts on list since I'm probably better
 with the 6800 than the teletype :-)
 
 My initial impression is that
 the width of the glitches is changing
 a lot
 each time one occurs and so this suggests to me contact
 bounce
 rather than a speed or timing
 issue.  You mentioned in the notes that
 you
 had cleaned the contacts.  Have you revisted that since
 collecting
 this data or ??
 
 73,
 Chris
 NØJCF
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