> For one-off, home projects, I'm in the "resistor-to-PIC" crowd.  I've used
it a dozen or so times with no problems...  but of course people are right,
it's not true EIA-232, it's not guaranteed to work, etc etc.

The sad thing is that it is so easy to arrange a simple interface which IS
true EIA-232.

You need a dual supply (a couple more cells to give the negative line ?) (a
zener to give a voltage drop ?)

and then arrange the switching transistor so that it can go below ground, eg
can switch to both positive and negative voltages.

The important thing is to arrange that the negative going pulse actually
swings a few volts negative.


..................... Zim

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