On 06/27/2016 05:34 AM, Paul Koning wrote:
> How high was "too high"? The RS232 standard rules for allowed output
> voltages are surprisingly lenient (3 to 15 volts, positive or negative
> for space and mark respectively).
Mark (not space) was around +3V, ha :-) I have no idea how the VT52 was
making sense of that, but it was, quite reliably.
--FritzM.