> > thanks for your advice... I did - theres a lot of confusion!
> > Youre right about sync-on-green: an adaptor must process signals from/to it.
> > This requires active electronics (some signal processing).
> > SGI -> VGA: extract and separate sync signals from green video signal.
> > VGA - SGI: combine hsync & vsync and feed it into green.
> Apparently not infinite enough.
> The RIGHT adapter would use the 13W3 pins 4 and 5 for horiz. and
> vertical sync on all Indigos and Indys to connect to the proper VGA
> A Sun adapter will likely not work, as it connects vertical out with
> horizontal monitor input. (pin 5/13W3 to ... )
> So, there is actually no need for a sync-on-green extractor/separator.
> Does this myth never die....
> Pin-Layout of a 13W3 (female end): () denotes mini-coax
> () 1 2 3 4 5 () ()
> 6 7 8 9 10
> An old rev. of the Indy Workstation Owner's Guide (007-9804-0020) from
> 1/94 does not have the pinouts of the 13W3 in Appendix A.
> BUT... the next revs., (007-9804-0040), 12/94 and 3/95 DO have all the
> information included:
> 1 MONITOR TYPE(3) (active low)
> 2 MONITOR TYPE(0) (active low)
> 3 COMPOSITE SYNC (active low)
> 4 HORIZONTAL SYNC (active low)
> 5 VERTICAL SYNC (active low)
> 6 MONITOR TYPE(1) (active low)
> 7 MONITOR TYPE(2) (active low)
> 8 GROUND
> 9 GROUND
> 10 GROUND
> -ID pins on a 13W3 connector are (MSBit first) pins 7, 6, 2. Hi-end
> want pin 1 Grounded, Indigo2 and Indy want it NC. Gnd means zero, NC
> For Indy, Indigo2:
> MonID monitor guessed
> 110 Single Scan 1024x768 60Hz 15"
> 101 Dual Scan 1280x1024&1024x768 60Hz 16"
> 100 Idem 19"
> 011 MultiScan 1280x1024&1024x768 21"
> 010 1280x1024, 76Hz, 16" (82 kHz line freq.)
> 001 DM-20 MultiScan 1280x1024 76Hz 19" or Single Scan Sony 1280x1024
> 000 1280x1024 60Hz only
> 111 yields no monitor attached. Default to lowest res / lowest vertical
> refresh (if nvram variable ``monitor'' not set to ``H'')
> for hi-End
> 111 No monitor
> 110 Single Scan 1024x768 60Hz 15"
> 010 MultiScan 16"
> 001 MultiScan 19"
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> Phone: +49 5251 606127, Fax: +49 5251 606065
> C-LAB is a cooperation of University Paderborn & SIEMENS
and not to confuse pinouts of Indy/Indigo/Indigo2 and the ones of a monitor. Were
now talking about an SGI monitor interfaced to a standard PC VGA output, right?
And *NOT* about making a PC monitor work on SGI machines! Then SGI workstation
display output pinouts are not of much relevance at all...
Have you tried to feed hsync/vsync out of a PC VGA into pins 4+5 of a 13W3 type
SGI/Sony monitor? If you did so or ever happened to open a GDM20D11 (the most
common of them SGI monitors) you will most likely find that none of all those ID
pins are connected at all. There ist only plain R, SoG, B (the koax pins)
Dont know about Indy, but these monitors work fine on my Indigo and Indigo2s.
Btw, if you want to feed them a VGA signal directly you wont succeed with some
simple tricks, like - never dying myth - breaking some ID pins. You are only about
to disconnect lines not in existence or already disconnected.
One workaround is to modify the entry stage near the Sony sync processor in order
to make it accept separate sync (it is originally suited for that). This
modification is not too tricky but includes disruption of certail lines on the
entry stage PCB inside the monitor, adding some shielded 75 Ohm wiring and a VGA
connector - and some metalwork.
Another - if you do not want to open the monitor - is to process the signal
outside the monitor, i. e. using some circuitry within an external adaptor (sync
processor) to combine PC hsync/vsync into the appropriate sync-on-green.
I have done both several times and kept the recipients of both adaptors and
modified input circuitry content.