You haven't lived until you have played with live long-line teletype
current loop circuits. In my first job as an FE on a Univac that was a
store and forward message switcher, we had racks of mercury relays
feeding the teletype lines, which ran at 130VDC to give the current
needed to get to the next hop! Working in that rack could result in some
very sudden surpsies!
cheers,
Nigel
On 17/08/2019 14:50, Charles via cctalk wrote:
In my prior life as an EE, I had to do it many times (early 80's)... I
may be nostalgic, but not THAT nostalgic :)
-----Original Message----- From: Chris Hanson
Sent: Saturday, August 17, 2019 1:37 PM
To: Charles ; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Pinout for current loop interface
On Aug 17, 2019, at 9:14 AM, Charles via cctalk
<cctalk@classiccmp.org> wrote:
I just hate having to make a custom cable for every terminal and
computer I
own or work with ;)
Ah, but isn’t doing what so many before you have had to part of the
charm? :)
-- Chris
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Nigel Johnson
MSc., MIEEE
VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
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