Pertec Interface Cable Length

[Glen Slick]

On Sun, Aug 11, 2019 at 7:44 PM Chuck Guzis via cctech
<cctech at classiccmp.org> wrote:
>
> On 8/11/19 6:00 PM, Douglas Taylor via cctech wrote:
>
> > I just looked at the TC02 and the Qualstar, there are termination
> > resistor packs on each.  The Qualstar has a bunch of 74LS240 IC's near
> > the J1 and J2 pertec interface cables.  The TC02 has a bunch of 74LS374
> > chips near the J1 and J2 connectors.
> >
> > This is where the electrical engineer could help.  How do you determine
> > how long a cable the 74LS240 can drive?
>
> TC02?  The DECtape controller?
>

I assume TC02 here refers to an Emulex TC02, a Q-Bus Pertec interface
tape controller which emulates a TS11 tape controller.

http://www.bitsavers.org/pdf/emulex/TC0251002-G_TC02tech_Jul85.pdf