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From: campbell@maynard.BSW.COM (Larry Campbell)
Newsgroups: comp.sys.dec.micro
Subject: Re: Rainbow video pinout
Message-ID: <1004@maynard.BSW.COM>
Date: Sun, 25-Oct-87 00:09:32 EST
Article-I.D.: maynard.1004
Posted: Sun Oct 25 00:09:32 1987
Date-Received: Tue, 27-Oct-87 01:23:48 EST
References: <8710240341.AA16133@ucbvax.Berkeley.EDU>
Reply-To: campbell@maynard.UUCP (Larry Campbell)
Organization: The Boston Software Works, Inc.
Lines: 34

First, let me just note that the document number for the Rainbow 100
Technical Manual is EK-PC100-TM-001, and I'm reasonably sure it's
still available from DEC.

Here is the pinout for the video/keyboard connector.  I *think* that
pin 1 is the upper left hand pin as you face the rear panel of the
machine, and that the odd numbered pins are the top row and the even
numbered pins are the bottom row.  You can easily check this with a VOM.

Pin	Description
---	-----------
1	Red shield ground
2	Green shield ground
3	Blue shield ground
4	Mono shield ground
5,6	Ground
7,8	+12V keyboard power
9	Blue video
10	Green video
11	Red video
12	Mono video
13	 unused
14	Keyboard received data (data to keyboard)
15	Keybaord transmitted data (data from keyboard)

The video signals are "similar to EIA RS-170", except that "the
composite video (Mono Video) signal on pin 12 is DC coupled and
therefore not in strict agreement with RS-170.  To agree with RS-170,
the composite video signal would require a 10 uf capacitor in series
with the output."
-- 
Larry Campbell                                The Boston Software Works, Inc.
Internet: campbell@maynard.bsw.com          120 Fulton Street, Boston MA 02109
uucp: {husc6,mirror,think}!maynard!campbell         +1 617 367 6846