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  • Qbus's Avatar
    January 8th, 2019, 05:36 AM
    Qbus replied to a thread Militarized PDP11 in DEC
    This is my Rolm 1602 Nova that was used in lots of military systems. They were used for decoding radar transponders and displaying the information on...
    6 replies | 424 view(s)
  • Qbus's Avatar
    January 4th, 2019, 01:49 PM
    Qbus replied to a thread Power Supply grounding in DEC
    Excellent design, resolves all the issues of the hot DC side. How do you synchronize the word sent to the printer with itself? Would assume they use...
    39 replies | 1180 view(s)
  • Qbus's Avatar
    January 4th, 2019, 10:26 AM
    Qbus replied to a thread Power Supply grounding in DEC
    Looking at the schematic, TC1 is the neutral, TC2 is hot (120) and TC5 and TC6 are the DC output to the relay and switch circuts. But remember that...
    39 replies | 1180 view(s)
  • Qbus's Avatar
    January 4th, 2019, 07:07 AM
    Qbus replied to a thread Power Supply grounding in DEC
    Looked at the schematic in the manual and yes, it’s a three pin plug for AC with the safety ground attached to the frame. The incoming AC is...
    39 replies | 1180 view(s)
  • Qbus's Avatar
    January 3rd, 2019, 02:43 PM
    Qbus replied to a thread Power Supply grounding in DEC
    Wow, sounds like the terminal you are using what us old timers call a “Hot Chassis” anytime you bring in the power line to any device and don’t use...
    39 replies | 1180 view(s)
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About Qbus

Basic Information

About Qbus
Biography:
Luddite, technological Idiot. Sped most time trying to reinvent the wheel.
Location:
Salisbury Maryland
Interests:
Antique computers, radio and telecommunications. From land line telegraph to satellite.
Occupation:
Broadcast and Telecommunications engineer, Salisbury University.

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