Sending 0377 via KL8JA

David Gesswein djg at
Tue Jan 20 16:08:52 CST 2015

On Mon, Jan 19, 2015 at 12:39:49AM -0500, Kyle Owen wrote:
> I am noticing something odd in SimH when sending a 0377 (all ones)
> character. It seems to be duplicating the byte. I haven't read anything
> regarding this behavior. I'm away from my hardware PDP-8 at the moment, so
> I can't confirm that this is not the behavior that I would experience on
> the real thing.
As others have commented this is a telnet thing. You can disable telnet and
get a raw connection.

For console I use
set console telnet=2222;notelnet
set tto 8b

For other port I use
att ttix 2222;notelnet
set ttox 8b

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