LTC Spec question

From: Fred N. van Kempen <>
Date: Mon Sep 6 09:22:08 2004

On Fri, 3 Sep 2004, John Lawson wrote:

> Anyway, to further clarify - this particular 11/73 is destined for
> (automotive) mobile roles, and therefore has had it's PSU replaced w/one
> that was made quite recently, albeit for computers a few generations more
> evolved than the DEC Iron. Also it is desired to be able to run the LTC at
> 100 Htz as well.
Kewl! "Powered by PDP-11" bumper stickers soon to be available! :)

(hey Bob... you REALLY must install one of those in your truck, and
have Debee use that as a packet radio relay ;-)

> I am tasked with simulating the LTC signal, a simple matter, but I
> haven't the actual electrical spec for this circuit, thus my question.
> There will be no mains reference available.
> Thanks for the fact that the LTC line is pulled up to 5V at the
> terminator. That's a big chunk of the interface question out of the
> way...
I think Qbus does fairly simple bus specs... high at 2.4V, and low at
ground to 0.4V or somesuch? Its in the Handbooks, John... those on the
shelf on your right hand side... :)

Received on Mon Sep 06 2004 - 09:22:08 BST

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