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December 19, 2018

Even DTCs can spark memories for 3000s

DTC to 3000 N-Class config
The Distributed Terminal Controller was a networking device with intelligence that stood between an HP 3000 and a peripheral. We use the past tense to describe the DTC usage for many of the homesteading 3000 sites. In some places, DTCs continue to let 3000s shake hands with other devices.

At TE Connectivity in Hampton Roads, Va. the box works between an N-Class 3000 (the ultimate generation) and an impact printer (of considerably older peerage). Al Nizzardini makes the pair work for the company that employs 3000s across the globe, from North America to China.

"Our DTC 48 with 3-pin ports died on us," Nizzardini said. "We have an impact printer connected to the 48, the only thing that is hanging off that DTC." At first the solution to the blocked connection was to use an even older controller, the DTC16 with modem ports. That would've involved shorting out pins on the DTC 16.

Nizzardini asked and a few veterans answered. Francois Desrochers said Nizzardini would need pins 2, 3 and 7 (send, receive, ground). "You may have to short out 5 and 20," he added. Another combination from Gary Robillard suggested connecting 4 and 5 together and 6, 8, and 20 together. "We always had 2 and 3 crossed—2 to 3 and 3 to 2," he said.

It's been 20 years since HP last released a DTC, something that's still useful for older peripherals. The intel to keep one connected to the latest 3000s is still available in the 3000 community. Old doesn't mean dead when someone remembers the essentials. Nizzardini solved his problem without shorting out pins, just by locating another working DTC 48. MANMAN drives the workflow at TE Connectivity, but the real driver is pros like Nizzardini, helping one another remember.

 

05:35 PM in Hidden Value, Homesteading | Permalink

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