Date: Sun, 26 May 2002 17:30:56 +0800 From: Raymond <[EMAIL PROTECTED]> Subject: Info about the keyboard and mouse ports ...
Hi all! OK I've finally taken my L100 apart and found out which pins do what as far as the PS/2 ports go. I have given up on my original idea of soldering to the back of the docking connector given that it is in fact surface mounted ... I'll be soldering to the keyboard controller instead. Turns out finding THOSE pins wasn't the hardest part however. The hardest part now is trying to figure out where the heck I'm going to get 5 volts from! You'd think it'd be easy on a motherboard like the libby but I'm having one hellava time trying to get continuity between the 5V pins on the PS/2 ports (pin 4) and ANYTHING on the motherboard. I do know I can get 5 volts from pin 4 of the battery connector (where pin 1 is separated from the rest by the plastic spacer) ... who recons thats a safe place to draw 5 volts from? I noticed that I can't seem to get continuity between that pin and any of the pins of the various chips I've tested (and you'd think that the rest of the motherboard would have the same 5V rail for its logic circuits). Alternatively, there is a test point near the 4 SMD resistors (or at least I think they're resistors) at the top left of the top side of the motherboard under the heatsink, in the area surrounded by the 2 capacitors, the 2 blue square thingys and the flat black thingy with a brown stripe on the left (gee things are getting technical!). There is about 2 ohms between the 5V points on the PS/2 ports and the 2 left through-plated holes above the upper left resistor in that group. Does that sound promising to anyone? I can't get any continuity on the other side of those resistors. I'm just a little paranoid about pulling 5 volts from the WRONG side of a given component and frying it. The only alternative I can find at the moment is pin 10 of the the MAX798 chip in the bottom right corner of the motherboard (there isn't any continuity between the 5V pins on the PS/2 port and this point but this is the 5V supply pin to that chip). I'd rather not go there however as that chip regulates the power going to the CPU ... If anyone is interested, the PS/2 controller appears to be the square chip just in front of the keyboard flat connector marked "Toshiba \ 471HP C1997 \ 062 737100" and the pins are (based on a continuity test): 12 = Keyboard data (pin 1) 13 = Keyboard clock (pin 5) 16 = Mouse clock (pin 5) 17 = Mouse data (pin 1) I've not tried connecting a PS/2 mouse or keyboard to this yet (as I don't know where the heck I could get 5V from) so I don't actually know if it works but a basic continuity test on the motherboard between these pins and the corresponding pins on the docking station (I don't have a replicator bar) yield a resistance in the range of a few ohms (not even a K or so) so I'm pretty sure they're the right pins. - Raymond P.S. Before anyone makes the connection, the information I have here is as a result of my own experimentation and reading of the L100/110 workshop manual that was so kindly provided by David, and is in no way connected with or based on a similar concept that appears at www.fixup.net . This information is not intended to replace or take over from whatever Xin Feng has on his website or the services he offers with regards to this (for one thing, I DON'T actually know what I'm doing ... ;-) --- /~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\ | | "Does fuzzy logic tickle?" | | ___ | "My HDD has no reverse. How do I backup?" | | /__/ +-------------------------------------------| | / \ a y b o t | [EMAIL PROTECTED] | | | Need help? Visit #Windows98 on DALNet! | | ICQ: 31756092 | Libretto IRC channel #Libretto on DALNet! | \~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~/ ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://www.silverace.com/libretto/ - Archives -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest **************************************************************
