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Date Posted: 01:46:10 10/23/01 Tue
Author: Alexey Danilchenko
Subject: Re: LCD in a color classic
In reply to: Scott Johnston 's message, "LCD in a color classic" on 23:35:18 10/22/01 Mon

I'm nearly finished with the same project (not as good looking as John's masterpiece with CC case but it'll do). Briefly (as it stated in CC's mega FAQ and in a lots of LCD conversations in this forum before) - it won't be sufficient to have only ATI (or any other) graphics card with DVI/DFP connector to drive LCD. Unless of course you will find LCD that accepts TDMS (serialised digital signals). Most of the LCDs I have checked have digital RGB (parallel) signals.

This means that most probably you will have to buy a controller. There are plenty of choices out there. But considering 800x600 resolution you want - you may want to buy a digital one - that is the one that takes TDMS signals (from graphics cards with DVI/DFP support) and produces native signals for your LCD. Example is at http://www.digitalview.com/products/controllers/info2.php?ControllerModel=DVI-1024

The other choice would be usual "analogue" controller that takes standard VGA signals and converts them to native signals for your LCD. This approach won't require you to buy any graphic cards but will be also compatible with any card should you buy one later. It also has one little drawback - in that signal is wastefully converted to analogue with a possible loss of quality. The chain of conversion you have here is: graphics card -> DAC -> VGA connector -> LCD controller -> ADC -> LCD. At the same time DVI controller will have other chain: graphics card -> serialiser -> DVI connector -> LCD controller -> de-serialiser -> LCD. On the positive side is that quality loss related to DAC/ADC is not noticable on small resolutions - so practically it does not matter.

Then other thing to mention is that it's not that easy to find 8.4" LCD that supports 800x600 resolution. John Stocker found one (as a part of laptop) (see our prior conversation here http://www.voy.com/24978/3/330.html and here http://www.voy.com/24978/3/346.html). I was limited at costs - so I'm using less expensive 640x480 LCD.

The whole modification should not take that long. But in my case - I completely re-designed the chassis to hold new PSU (taken from PC ATX-type) two SCSI drives (+ SCSI3 PCI adapter), slot-loading DVD, sound amplifier for internal speakers (since analogue board is gone), TV-tuner & IR card apart from LCD and LCD controller board.

Alex

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Replies:

Re: LCD in a color classic -- Scott Johnston, 08:28:28 10/25/01 Thu