From: Groepaz (groepaz_at_gmx.net)
Date: 2003-11-01 14:30:33
On Friday 31 October 2003 08:50, Baltissen, GJPAA (Ruud) wrote:
> I have played with this idea as well. But how? First you have to find out
> which pin is an input, which one is an output. The safest way IMHO is to
> use resistors. You connect a pin to GND through a 2K2 resistor. Is it a
> input, the voltage at the pin is near 0 Volt. Is it an output, the readings
> will be much higher. And now try to translate this idea to a working
> design. It is doable but a hell of a job. And not worth the trouble IMHO.
thats why you use a computer for it...it can probe all possible combinations
very quickly :o)
> Nicer would be placing it in an IC-tester and telling it the type of the
> pins and then let him do the job by comparing it with a build-in database.
i think the program i was referring to worked the way that it had a database
and used it for probing.... i dont think its really necessary to find out
what is input and output first, since it wont really harm a (ttl) chip if
you use it wrongly for a few milliseconds. (you may add some electronics to
keep current low on the pins used for probing if in doubt)
gpz
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