Trash80toHP_Mini wrote:Yep, how to use a PowerBook LCD for anything other than running off the the controller on that particular LCD's connector...
I'm not sure what you're hoping for here, Trash. The part in question from the TAM is just an early (and clunky) implementation of exactly what the answer to that question has always been, IE, you need a VGA->to->LCD converter board, usually called a "controller". It does exactly what those $40-off-eBay-from-China controller boards do except it's designed around the quirks of a particular mid-nineties LCD (rather than configurable for any arbitrary number of LCDs) and undoubtedly requires umpteen-times the components and board real estate to do the job.
If your idea is that it's somehow simple enough (due to its age) for a hobbyist to "clone" out of household materials on his workbench, well, I doubt it. Not having seen the board in question I'd venture that at the very least it uses an oddball unobtanium surface-mount ASIC or two. And here's the really salient point about "homebuilding" an LCD controller: Even lowly bog-standard VGA, 640x480@60hz, has a pixel clock of about 25Mhz. Go up to 800x600 you're looking at 40Mhz. XGA, 65Mhz. At its very simplest the heart of an LCD controller is three analog-to-digital converters which, again, need to run at *at least* 25Mhz and more practically *much* faster. (And of course on a "real" implementation the ADCs are just one step.) Designing something that performs well at speeds like that is *not trivial*, and it's highly unlikely you'll undercut the cost of "$40 from China" building it at home even if you're capable of doing it.
But, hey, if you really want to try the mountain is there waiting to be climbed. All above said it probably *can* be done in an appropriate FPGA, but... again, what would that have to do with the TAM board?
Kind of like changing the startup sounds and icons in the Mac's ROM . . .
Conflating the degree-of-difficulty level of burning a custom ROM with that of a from-scratch high-speed analog/digital conversion board construction project is a little... silly. (I'm not trivializing the level of work that went into figuring out what needed to be "hacked" in the Macintosh ROM by saying this, but when it comes to physical implementation burning a ROM is a lot simpler than building an LCD controller.)