11 Oct
2003
11 Oct
'03
8:33 a.m.
Must have been a temporary blip, as it's there now.
--
---------------
Antonio Carlini arcarlini(a)iee.org
-----Original Message-----
From: cctalk-bounces(a)classiccmp.org
[mailto:cctalk-bounces@classiccmp.org] On Behalf Of Joe
Sent: Saturday, October 11, 2003 7:19 PM
To: General Discussion: On-Topic and Off-Topic Posts
Cc: waltje(a)pdp11.nl
Subject: Re: ASR33 Teletype interfacing
Fred,
I tried to access the website and got an error stating that
it could not be found. I tried to access the domain itself
and I got an error stating that it's not configured yet and
to try again later.
Joe
At 07:19 PM 10/11/03 +0200, you wrote:
On Sat, 11 Oct 2003, Ian Primus wrote:
> > If you want to receieve also, you can use another transistor and
> > resistor to pick off the change in loop current that
happens when
> > you press keys which open the loop, and
drive the serial port.
> >
> > I've done one of these fairly recently, and if poked with a
> > not-too-sharp stick, I'll scan the schematic and pu on
my website.
I found a 20mA interface schematic in my pile of docs.. I
put it up on
http://www.pdp11.nl/Hardware/20mA.pdf
Cheers,
Fred
--
Fred N. van Kempen, DEC (Digital Equipment Corporation)
Collector/Archivist
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