help - 11/34 console problem -- CNTRL key behaviour

Gooijen, Henk henk.gooijen at
Thu Nov 10 07:44:52 CST 2005

Allison wrote: 

> Well it does not have to be a clock.  It happend the product 
> I was working on was a time code display for video tape where 
> the display could be time or number of frames.
> Besides the display system for PDP-11 is likely OCTAL. ;)

True, but the latch that outputs the 3 bits for the 7447 has
a fourth output which could be used! Take that 4th output to
the 7447 'D' input (which is now connected to GND) and you
can display an "8" or a "9".  But I am drifting off-topic --
the console must work for starters :-)

- Henk, PA8PDP.

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