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Feedback from the LCD driver rather than the code that is running? Notice that the sound changes exactly as the screen changes images. "Welcome to Macintosh" (whine changes) "gray before Finder appears" (whine changes) "Finder window appears" (whine changes) "Chooser appears" (whine changes)...

Thank you for your thoughtful reply. One of the things I've learned to value the most in life is when someone is willing to share their perspective with you, particularly on deep and sensitive topics. There is no greater human gift. Not at all. Your post is genuine and positive. - David P.S...

Similar to nearly everyone on this forum, I enjoy talking about old computers and I am kind to others. If you are like that, then you are my friend. This hobby takes me away from the stresses of politics, social issues, and global conflicts. I would be less likely to participate in any group...

If you control the applications, you could always just register a gestalt value that contains a pointer to a buffer or callback methods. Edit: I now see you want to do it over a network and not within the same machine.

Upgrading the Color Classic board with +256KB of VRAM allows it to display 256 colors @ 640x480 when installed in the Performa 550.

Yes. It works fine and defaults to 640x480. This is an unmodified Color Classic motherboard (LB) in an unmodified 550 (analog board + display). Extra VRAM is not installed, hence 16 colors.

That's pretty cool. Based on the picture, I thought it was a 7300/7600 card. It should just pop in and work. Upon reading, I understood it was more interesting and it needs software to kick in.

Is there corrosion on the inner contacts of J3? Or is that just a reflection? Is J3 connected to anything when the board is installed?