RCA 1861, NTSC and a DEC VR-201 - test-drb@ccmp.vtda.org

27 Sep 1999

--- allisonp(a)world.std.com wrote:
...
  No scan or copy capability.  The unit I was woking
with required a
 resistor from the video ouput to ground, I'd picked 75ohms for the
 purpose. 
Everything I've seen is like the basic 1861 design in the Elf-II article in 
P-E: http://www.infinet.com/~erd/retrocomputing/ElfII/  (10K resistor on
SYNC, 2K resistor on VIDEO, tied together and to ground by 1K resistor).
Perhaps I just need to play with the resistor values.

...
  I'd have to see the circuit you have to figure it
out.  there were several
 variations. 
It's the standard COSMAC VIP.  I'll scan the 1861 output section and post
a URL for it later tonight if I get the chance.  IIRC, it looks just like
the Elf-II circuit.  Nothing complicated.

-ethan

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