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Home Forums 68kMLA macintosh II not starting up or displaying — #4
Post #4 by RalfK
Source Forum68kMLA
CategoryHardware
Post DateMon, 20 Apr 2015 - 12:42
Original URLhttps://68kmla.org/bb/threads/macintosh-ii-not-starting-up-or-displaying.1796/
Post
Since i dont have a mac monitor im using a lcd flat screen with the mac to vga adapter by belkin.  No video, so I thought maybe the video card so i used another from the other mac as both video cards are macintosh II video cards, the stock ones i guess.  No change, so from what i read it might be the fact of refresh rates or signaling since im using a mac 2 vga converter.  I have it in 13" rgb mode, switch wise, and the last time i used this adapter was on a pm 6100 i have and then a mac II si.  At that time the adapter worked.  So im out of ideas as to why no video display?
The capacitors are mentioned before. But the other problem could be that the lcd isn't able to use the video signal from the old mac card. (Win-)DOS-PCs never used these H-Sync and V-Sync frequencies. There were even a lot of Multisync monitors which were not able to sync to mac frequencies. Try another video card or another flat screen. Video cards built by RasterOps or Radius would be my first choice (running at 1024*768 or 800*600) for testing, or Formac or Villagetronic from Germany. These were popular here.

Which card are you trying? Probably you can identify your cards:

http://www.cls.ne.jp/fujino/Nubus/          (the pictures and the names can be recognized .... :) )

mp.ls