On Mon, 04 Oct 1999, der Mouse wrote:
>I once got a library to dig up a copy of RS-232C.  I don't know about
>earlier revs, but the standard I read definitely did not use TTL signal
>levels.  I no longer have it at hand, but to the extent that my memory
>can be relied upon, this paragraph is right:
>
>> Indeed what it all boils down to is that a logic "1" value is
>> represented by a voltage between +3 and +25 VDC, and a logic "0"
>> value is represented by a voltage between -3 and -25 VDC.

  Umm, I believe those levels are inverted.  A "1" is represented by the
negative voltage, and a "0" was represented by the positive.  That stuck in my
mind from way back because it's...well, inverted. :-)

                       -Dave McGuire