Looks nice Don, but you need to stretch out the probe signals with 74LS123’s otherwise the H of L will not be clear/stable. Take a look at the circuit here:-
http://s100computers.com/My%20System%20Pages/Extender%20Board/Extender%20Board.htm
Actually if you had time converting it into a true extender board would be the best of both worlds (but a lot of work!)
John
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Don Caprio
Sent: Sunday, March 22, 2015 10:08 AM
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:6636] S100 Breakout Board - Version 3
Guys,
What do you think about this new version of the breakout board?
I doubled the number of test pads and added six built in logic probes.
You can monitor up to six signals with the 7 segment LED showing
H (High) or L (Low). To monitor a signal you place a jumper from the
signal post to a bus pin.
I tried to use a simple logic probe design to conserve on board space.
Design uses 7404. I'm open for suggestions to improve probe circuit.
Thank you.
--
Don Caprio
ilv...@gmail.com
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