>Mad Dog, > >Thanks for the help, but that number wasn't listed in my hard print >catalog, nor in the searchable catalog on the Digi-Key website...
Search for this term: SE2849CT-ND >If it helps at all, the part is about 10x5mm with the solder pads >forming a square 5mm on a side. > >The closest part to that I can see is SE2848CT-ND (33.3333MHz part). >What do you think about replacing it with SE2849CT-ND (36.000MHz). Thats the part. You ought to be ok. That will raise the 100 MHz CPU to a speed of 108 MHz. >That's Epson Electronics part #SG-636PCE 36.000MCQ (Also, a 38MHz >part on the CE board will give me 133MHz... ;-) Think I could get >that w/ a little thermal grease under the heatsink?) Did apple use the crappy corrugated heat pad on the 5300 ? IF so, replace it with a better heat pad. >I took apart the CE and CS again to compare mobos... There are some >*subtle* differences (besides the missing 8MB RAM on the CS, which is >pretty glaring). Between the CPU and oscillator, there is a row with >5 resisitor positions labeled R46 - R50. Immediately to the right of >the oscillator are R127, R43, and R44. On the bottom of the boards in >the same place (beside the oscillator) are R126, R128, and R129. R45 >is off to the left near the trackpad/sleep actuator connector and is >set on both mobos. > >R#: 43|44|46|47|48|49|50|126|127|128|129 :: Resistor position >CS: --|--|OO|--|--|--|OO|---|OOO|OOO|--- :: 5300cs 100MHz mobo >CE: OO|--|--|--|OO|--|OO|---|---|OOO|--- :: 5300ce 117MHz mobo >---------------------------------------- >OO or OOO denote an open position >-- or --- denote a closed position That might be it. Go to motorolla and dload the docs on the 603 and see if the PLL pins trace out to those positions. >So the CE and CS mobos have R44, 47, 49, 50, 126, and 129 in common. > >I should point out that I'm no good at tracing circuits (never learned >how, exactly), so I have no idea what these resistors are connected >to, but it seems they are connected to the oscillator. There are 4 pins on the CPU that determine the setting. >Anyway, maybe that gives you or someone else some ideas about changing >the CPU multiplier... Do these early 603/NuBus based machines support >bus multipliers? Can you, say, set the bus to 1.5x the oscillator's >frequency like you can on late model PowerMacs/Books? Normally, yes, you can change them by adding or removing resisitors that connect to the 4 PLL pins on the CPU. For example, see: http://mywebpages.comcast.net/gionpeters/HHHH/PB1400/PB1400.html Scroll about 1/2 way down the page. >Peace, >Drew Mad Dog -- PowerBooks is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> PowerBooks list info: <http://lowendmac.com/lists/powerbooks.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/powerbooks%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
