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Date Posted: 00:44:37 11/08/01 Thu
Author: Adam
Subject: VGA Mod: 4.7KOhm resistor to Pin 20 of a/b. HELP!!
In reply to: Adam 's message, "4.7KOhm resistor to Pin 20 of a/b connector" on 23:30:24 11/07/01 Wed

Oops, I hit the wrong thing and created a new thread - damn. The above message was meant to go into the "Right way to solder a CC" thread, so if you haven't read that, the previous post no doubt makes no sense. Sorry.

Down to business. I found the frogeye Takky site and followed the link for the VGA modification to http://www.bekkoame.ne.jp/~t-imai/maine.html (the actual link at the frogeye site is messed up and takes you to bekkoame.org and an error message.) Sadly, this makes no mention of the 4.7KOhm resistor, so all I have to go on so far is the CCSCC FAQ.

I get the idea that to add the resistor, I'd have to recinfigure the CC's sense-coding by splicing the IDC cable as detailed by the CCSCC. The reason I think this is because splicing the IDC cable described on the CCSCC site would isolate the logic board completely from pin 20 of the analog board. Therefore the l/b would be isolated from the current induced into pin 20 by connecting it to BD7 with the afrementioned 4.7KOhm resistor.
On the other hand, given that pin 20 of the a/b doesn't seem to be connected to anything after the IDC cable is cut, what would be the point of adding the resistor? The current from BD7 couldn't flow anywhere, so it would be as if the resistor wasn't there at all

Maybe I'm just interpreting thing the wrong way. If anyone has tried this mod with the 4.7KOHM resistor, or has _any_ idea of how to do this or what goes on, I'd love to hear from you bacause I'm becoming more and more unsure.

Also, if anyone knows of any description of how to add the 4.7Ohm resistor other than that in the CSCC FAQ, I'd be happy to hear it.

I apologise if this sounds wierd and disjointed (it does), but I'm typing this on four hours sleep after a (hideous) day of work.

Cheers,
Adam.

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