RCA 1861, NTSC and a DEC VR-201

From: Ethan Dicks <ethan_dicks_at_yahoo.com>
Date: Mon Sep 27 13:28:28 1999

--- allisonp_at_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.


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Received on Mon Sep 27 1999 - 13:28:28 BST

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