Pertec Interface Cable Length
dj.taylor4 at comcast.net
Sun Aug 11 20:00:43 CDT 2019
On 8/11/2019 7:01 PM, Jon Elson via cctech wrote:
> On 08/11/2019 11:11 AM, W2HX via cctech wrote:
>> I seem to remember they were ribbon cables
>> with each odd/even pair twisted which probably meant one
>> active and one ground twisted together.
>> Or differential pairs.
> No, both Pertec unformatted and Pertec formatted interfaces were TTL
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?
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