The information you are looking for is actually a CDEV/INIT and a documentation
file. These are on AppleLink in a file called "32-Bit QuickDraw Demos" under
the "Developer Services" icon. Here is the path:
Developer Services
Developer Technical Support
Macintosh
32-Bit QuickDraw
32-Bit QuickDraw Demos
The CDEV/INIT file is called "Macintosh II Video Utility", the documentation
file is "Video Utility Read Me".
Here is the information included about the cable:
"You will need a special cable to connect an RS-170-compatible monitor (or VCR)
to your Macintosh. One side must plug into the Apple Macintosh II Video Card.
It must have a 15-pin male DB-15 connector. The other side must plug into your
video equipment. Pin 5 of the DB-15 connector contains the RS-170-compatible
monochrome video signal. Pin 6 is the shielding ground for this signal.
Typically, you connect pin 5 to the central wire of your video cable, and
connect pin 6 to the shielding braid."
"WARNING: It is possible to damage your video equipment and/or your Macintosh
II by using an improperly constructed cable. If you are not familiar with
video equipment, you should not try to make a special cable!"