VGA video output with color classic, trying to get SVGA

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Last seen: 3 years 2 weeks ago
Joined: Dec 20 2003 - 10:38
VGA video output with color classic, trying to get SVGA

I have now managed to get my Color Classic working with a cube video card. I had had lots of difficulty with this, fiddling with various ID lines and trying to imitate an Apple adapter- turns out it's easy, just leave all but the video and h/v sync lines unconnected. The computer then puts out 640x480@60hz, which works (finally!). 640x480@67hz works as well. Problem is, 800x600@56hz doesn't work, despite the fact that I've had the Color Classic display in that mode before, with an LC575 m/b if I recall correctly. The screen just goes blank before it automatically switches back (i.e. it's not just a bad picture, it's no picture at all). I am able to get 800x600@56hz from the video card just fine on a different PC monitor, and like I said the CC board has handled it in the past from a different source.
Anybody venture a guess why it won't work?

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Last seen: 9 years 5 months ago
Joined: Jan 29 2005 - 15:41
24bit color on CC

I'd like to use a 24bit color LC-PDS card sending video to the CC display instead of the onboard video. Taking off the VRAM SIMMS in the LC575 mobo makes the LC-PDS card the only display available. How did you manage to wire the cube's video to the CC's analog board?
Thanks Smile

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Last seen: 3 years 2 weeks ago
Joined: Dec 20 2003 - 10:38
The wires to the harness need

The wires to the harness need to be cut, and extension wires connected, attached to male pins (I used the crimp-on kind from a DB-25 kit from Radio Shack). The harness wires would be a pain to re-connect, so before doing something that drastic, be sure it's really worth it. To quote from the Color Classic FAQ:

"It has been speculated that a video card's output could be connected to the appropriate video lines in the wiring harness in order to drive the internal monitor from a video card, but no one has (to our knowledge) yet tried this, and since no LC PDS cards come close to the speed of the built-in video on the 575, it seems like such an endeavour might be a waste of time."

With enough VRAM, the 575 can do 16 bit; I would consider the hassle (and, in the event the result is unsatisfactory, difficulty of undoing the harness modification) vs. the (in my mind, small) benefit of the extra color depth.

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Joined: Jan 28 2009 - 11:03
Dead_Elvis could you show us some pictures

Dead_Elvis I'd really be interested in seeing some pictures of your modification to your color classic. Could you please post some for us all to see?

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