Z80 CLK DRV

1 Jul 2012

...
   Is it not
plausible that 330 ohms to ground represents 327 ohms to
 Vcc plus three ohms Vcc-to-GND? 
 Really?  Do you not want to re-think that? 
Well, it's unlikely to be a simple three ohms.  However, it easily
could represent the effective resistance of the rest of the chip - or,
more likely, the voltage dropped as small amounts of current leak
through various paths, translated into a resistance measurement.

Or, again depending on the details of the meter technology and how the
measurement is done, it could be that the 327 ohm measurement does not
represent 327 ohms of resistance but rather the forward drop of one of
that input's protection diodes.

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Z80 CLK DRV