When I construct the device, I am planning to build the device thru-hole.
 In addition, I am not a
fan of stealing power from the printer port.  I am going to include a 5
volt power source.

 1.I do not have the 40106 schmitt trigger inverter, however  I have lots
of the 74HC14  which I plan to sub.

 2. I do not have the 5.0688 MHZ crystal, but I do have 4 and 6 MHZ
resonators.  I am
  going to sub one of these and change the frequency divider tap.

 3.  I amazingly enough found a 4060 in my parts supply.  Because an
extra inverter is
 available in the 74HC14, I think I could make this inverter drive the
crystal.  Then the
 4040  or 4020 could be subbed for the 4060.

For readers who have not seen the article, the crystal and divider are
used to produce a
timebase for calibration only.  The article claims that this timebase is
4950 HZ.  However my
analysis of the circuit is that timebase is 500 KHZ, (crystal frequency
divided by 10.)  My plan
is to use different crystal, but change the divide ratio to maintain 500
KHZ.


The ftp site of the software is
ftp://ftp.gernsback.com/pub/EN/logprobe.zip    The status of this
software is unclear.  An upgrade is available for $15, yet it is not
labled shareware or eval.  The
software prohibits copying the software to other BBS than Electronics
Now.


 ---- Steve