Pertec Interface Cable Length

Chuck Guzis cclist at
Sun Aug 11 21:44:15 CDT 2019

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?

Sorry, I must be dense; I'm not following.


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