From: lupe@ukw.uucp (Lupe Christoph)
Newsgroups: alt.sys.sun,comp.sys.sun.hardware,comp.sys.sun.misc
Subject: Re: 13W3 Monitor cabling?
Date: 26 Sep 92 11:03:39 GMT
Organization: cic

alh@einoed.in-berlin.de (Adrian Le Hanne) writes:

>Hi,
>i need the cabling scheme for the 13W3 connector on the Sun graphics
>boards (CGx, GX). This is for building/modifying monitor cablings for 
>66 Hz and 76 Hz monitors (as i remember, there were some sense pins for 
>the monitor type (refresh rate, grey or color}.

Here is an article I saved:

From: shapiro@jashap.rutgers.edu (Joel A. Shapiro)
Newsgroups: comp.sys.sun.wanted
Subject: Sun video cables
Keywords: video cables, sense connections
Date: 3 Jul 92 15:20:25 GMT
Organization: Rutgers Univ., New Brunswick, N.J.

On April 10 I posted a question (I think in this group) about making
monitor cables for Suns, specifically 13W3 connections for mono
sparcstation II's. I included some info from Sun, which turned out 
to be backwards (and led me to many wasted hours!). Let me correct
this info here.

The info from Sun said
->       Three pins are provided on the 13W3 connector for monitor
->       identification. These pins are internally pulled up. The
->       appropriate pins should be tied to ground for a zero and
->       left open for a one. The monitor ID may be read via a re-
->       gister in the Lego Frame Buffer Control (FBC chip). The
->       codes are tentatively assigned in the next table.
->
->       Monitor         Resolution              ID2   ID1   ID0
->
->       No monitor                               1     1     1
->       Reserved        640x480                  1     1     0
->       ECD             1024x768                 1     0     1
->       Apple           1152x870                 1     0     0
->       Sun Standard    1152x900, 66Hz           0     1     1
->       GPD Proposal    1280x1024                0     1     0
->       Sun Proposal    1152x900, 76Hz           0     0     1
->       Reserved                                 0     0     0
and 
-> Colour Monitors
->
->       1 GND                    8 SENSE1
->       2 VSYNCH                 9 SENSE0
->       3 SENSE2                10 GND
->       4 GND                   A1 RED
->       5 CSYNCH                A2 GREEN
->       6 HSYNCH                A3 BLUE
->       7 GND
->
-> Mono Monitors
->
->       1 No Connection          8 No Connection
->       2 No Connection          9 No Connection
->       3 Jumper to pin 4       10 H-V GND
->       4 Jumper to pin 3       A1 No Connection
->       5 H-V Combined Sync     A2 Video (coax)
->       6 No Connection         A3 No Connection
->       7 No Connection

This would seem to be consistent, in that the connecting of 3 and 4
would make ID2=0 while the floating 8 and 9 would make ID1=ID0=1, and
tell the CPU my monitor is a Sun Stardard, which is almost surely
true.

However, after a long painful trip through all possible attempts at
making this work, I discovered that the correct connections are the
opposite. That is, I connected the 13W3 at the computer end with
pins 4, 8 and 9 connected, 3 floating, and 5 and 10 a twisted pair to
the other end. On the monitor side only 5, 10 and the A2 coax, and 
pin 4 to ground, are connected. 

I would still like to here from anyone else trying to make his own
cables. Mine over 60 ft were not successful.

	Joel Shapiro
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