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Conference hydra::amiga_v1

Title:AMIGA NOTES
Notice:Join us in the *NEW* conference - HYDRA::AMIGA_V2
Moderator:HYDRA::MOORE
Created:Sat Apr 26 1986
Last Modified:Wed Feb 05 1992
Last Successful Update:Fri Jun 06 1997
Number of topics:5378
Total number of notes:38326

4062.0. "MITSUBISHI & A2000, HELP!." by HAMER::DRAGOMIRESCU () Wed Aug 29 1990 16:21

  Could someone check my problem and help with the right advice or
suggestion?
  I try to att. a Mitsubishi multisync monitor to my A2000 with a
home made cable, and I have these strange results:

  With the cable connected to the monitor when I power up the A2000
I get first the gray and dark green and next no picture, looks dead !
I reset (AA,contr), no help, no picture.
 If I power up with no cable connected to monitor wait few sec. and
next I connect the cable to monitor input port I get the right picture
and I am back in business.
 Now  if reset (with cable connected),. I lose the picture but if I
reset without the video cable connected and plug it back few sec.late
I get the right picture back !
The cable connection is the follow:

    A2000 pin                Mitsubishi pin
    3 ana red----------------2 ana red
    4  ,  green--------------4  ,  green
    5  ,  blue--------------14  ,  blue
   11 hsync  ---------------16 hsync
   12 vsync  ---------------17 vsyn
   16-20 gnd.---------------3,5,15,1 gnd.

 Is anything that I am missing in the cable connect? Is my monitor not
sending or receiving the right signal.?
I am using the same monitor with an IBM VGA on the RGB TTL port with no
problem, is the RGB Analog port faulty?
 I will appreciate any suggestion, I looked throw notes and I did not see
any info. for this problem.

 Thank you.


  
      
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4062.1NSSG::SULLIVANSteven E. SullivanWed Aug 29 1990 17:2414
The problem you are seeing is related to the diamondscan loading of the 
synch lines. This makes the Amiga "think" there is a genlock attached and
supplying clock/synch... 

Redmond cables makes a cable that uses a buffer chip to prevent this. 

Another approach I have heard, but not tried, is to use composite synch.
I do not know the details of this off the top of my head.  Perhaps another
noter has the DB23 pinouts handy.

The diamondscan is a great monitor - very versatile - for the amiga. The 
numerous input formats make it ideal for multimedia use.

	-SES
4062.2Try the composite sync pinsLODGE::LENDavid M. LenWed Aug 29 1990 21:456
    I sorry that I don't have the time to properly answer this question
    now.  But, when I made my cable for a NEC Multi-sync 2, I think that I
    used the composite sync pin and NOT the separate H and V sync(s).
    
    		Good Luck.
    
4062.3Try Comp. SyncGIDDAY::MORANI'm not bad-I'm just drawn that way!Wed Aug 29 1990 22:435
    I made my cable up a little over a year ago so I can't remember exact
    details but I'm sure I used the composite sync signal.
    
    Shaun.