[time-nuts] VFD Idea for HP Equipment

[Chris Hastreiter]

Hi,

Here's a simple idea in case anyone else is doing long duration testing
with HP equipment from the Vacuum Fluorescent generation before they began
including a display-off hotkey.

This particular example is a 53131A counter which is also before they began
putting a separate microcontroller in the front panel assembly for display
operation.  Pin 21 in the ribbon cable is the +38V anode voltage for the
display, and pins 22 and 24 are the filament circuit.  An auxiliary switch
interrupts pins 21 and 24 to turn off the VFD and allow the device to
continue to operate in remote mode.

Chris
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