Sun Sparc 20 Monitor Troubles

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dpn9296
Posts: 2
Joined: Thu Feb 02, 2017 7:24 am

Sun Sparc 20 Monitor Troubles

Unread postby dpn9296 » Thu Feb 02, 2017 10:51 am

Hello
I'm trying to use a 10 year old Dell flat screen monitor on a Sun Sparc 20 machine using a 13w3 to svga HD15 cable with dip switches, which I've set per included instructions. When I start the Sun with Sun monitor connected and then connect the cable to the Dell monitor, it works fine. If I reboot the Sun and then try to start while connected to the Dell monitor, I get no image.

Any help would be much appreciated.
Thanks,
Dan

robespierre
Posts: 1523
Joined: Mon Sep 12, 2011 2:28 pm
Location: Boston

Re: Sun Sparc 20 Monitor Troubles

Unread postby robespierre » Thu Feb 02, 2017 5:06 pm

The Sun 13W3 connection has monitor ID pins (I think; there were multiple Sun pin assignments, just like there were multiple SGI assignments).
If your adapter is wiring those thru to the monitor, they will get the DDC signals and be really confused.
What the adapter should do is make sure the monitor ID pins (from the computer) are either grounded or floating, depending on the resolution desired. The DDC pins from the monitor should be floating.

From http://www.sunhelp.org/faq/FrameBuffer.html :

Code: Select all

Code   TGXplus(1)   TGX(2)      GXplus      GX (LSC chip)
-------------------------------------------------------------------
7    1152x900x66    1152x900x66    1152x900x66    1152x900x66    
6   1152x900x76   1152x900x76   1152x900x76   1152x900x76   
5   1024x768x60   1024x768x60   1152x900x66   1152x900x66
4   1152x900x76   1152x900x76   1280x1024x67   1152x900x76   
3   1152x900x66   1152x900x66   1152x900x66   1152x900x66   
2   1280x1024x76   1152x900x66     mutant(3)   mutant(3)
1   1600x1280x76   1152x900x66     mutant(4)   mutant(4)
0   1024x768x77   1024x768x77   1152x900x66   1152x900x66

Code   SX      ZX      S24      
------------------------------------------------------
7   1152x900x66   1152x900x66   1152x900x66   
6   1152x900x76   1152x900x76   1152x900x76
5   1024x768x60   1152x900x66   1024x768x70
4   1152x900x76   1280x1024x67   1152x900x76
3   1152x900x66   1152x900x66   1152x900x66
2   1280x1024x76(5)   1280x1024x76   1152x900x76
1   1600x1280x76(5)   1152x900x66   1152x900x66
0   1024x768x60   1024x768x76   1152x900x66

   1   SCL          6   SDA
   2   +5V          7   Reserved [VSYNCH]
   3   SENSE2          8   SENSE1
   4   Ground          9   SENSE0
   5   CSYNCH         10   Ground

The sense pins are 1 when floating, and 0 when grounded. So ID=5 would be set by grounding SENSE1 and leaving SENSE2 and SENSE0 floating.
:PI: :O2: :Indigo2IMP: :Indigo2IMP:

dpn9296
Posts: 2
Joined: Thu Feb 02, 2017 7:24 am

Re: Sun Sparc 20 Monitor Troubles

Unread postby dpn9296 » Sun Feb 05, 2017 11:21 am

Robespierre,

Your fix did the trick !

Many thanks !!!
Dan


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