Sigh. Bringing up a PDP-8/M

From: Dave Dameron <ddameron_at_earthlink.net>
Date: Thu Apr 15 07:27:02 1999

At 10:45 PM 4/14/99 -0400, Allison wrote:
><From CLASSICCMP-owner_at_u.washington.edu Wed Apr 14 21:46:30 1999

>I have one in a clear pen barrel with a point and and a cliplead, very
>handy! It's pretty easy to tell, high low and something that's pulsing
>even at high rates. Another handy item is a 4040 cmos counter to make
>fast things into tones (earphone). That trick came from the NS* disck
>controller troubleshooting hints.
>
Hey! I thought of a 4040 tester a few years ago on my own. I guess it isn't
original after all. It is small and useful, It has shown for example, a Z80
quartz clock oscillator which started oscillating on its 3'rd overtone (the
Z80 would not run). Another case was a 54LS74 as a toggle FF which failed
and the Q output followed the clock input instead of divide by 2.
-Dave
Received on Thu Apr 15 1999 - 07:27:02 BST