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Chip Sources for 32Mb Upgrades

New MessageChip Sources for 32Mb Upgrades (modified 0 times) Glitch
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I've found a reasonable source for chips for the ePods rev 1.1 memory upgrades. Crucial Technology sells a module with Micron MT48LC4M16A2-7E chips on it. The module part number is CT4M64S4D7E. Here is a link to the module on Crucial's web site. Of course, these chips will also work on the rev 1.2 motherboards. Each module has four chips (enough to upgrade two ePods).

For those who haven't been following the memory upgrade threads...

The chips have to be removed from the modules so that they can be soldered on to the ePods motherboard. These modules will not "just plug into" the ePods.

I have some loose chips for sale. I am offering these for those of you have the skills to solder the chips on to the motherboard, but don't have the skills to desolder them from the memory modules. IMHO, the desoldering is the hardest part.


Glitch
Electronics run on smoke, if you let the smoke out they won't work
02-15-2001 10:05:44

New MessageRE:Chip Sources for 32Mb Upgrades (modified 0 times) JC88
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Glitch, I am interested in purchasing the loose RAM chips. Do you have caps for sale too? These caps are needed on 1.1 boards right? Thanks!
02-15-2001 11:16:20

New MessageRE:Chip Sources for 32Mb Upgrades (modified 0 times) Glitch
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JC88: I haven't really considered offering a "kit". I there is enough interest, I'll put one together.

For other interested in loose chips or kits: Please do not contact me here (on the BBS) for info. Contact me via email. I would like to comply (as much as possible) with Ken Segler's wishes for NO DIRECT FOR SALE or WTB POSTS. Thanks.


Glitch
Electronics run on smoke, if you let the smoke out they won't work
02-15-2001 11:30:40

New MessageRE:Chip Sources for 32Mb Upgrades (modified 0 times) Pete
Ordered chips...how about surface caps?? any recommendations...
Pierre
02-15-2001 12:38:19

New MessageRE:Chip Sources for 32Mb Upgrades (modified 0 times) JoeFloyd
Sorry if I'm stepping on your post Glitch. If your a little more adventours you can order the DIMM from crucial for about $25 total. You will have to desolder the chips from the DIMM yourself. Desoldering may be more difficult than soldering for the novice, but the DIMM also has the surface mount resistors and caps you will need to perform the hack.
02-15-2001 13:56:55

New MessageRE:Chip Sources for 32Mb Upgrades (modified 0 times) Glitch
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JC88 & Pete: The Crucial modules have plenty of caps to do a single mod. There are not enough caps for two mods if you want all the caps pads populated. I have not measured any of the caps on the Crucial modules to determine if they are of a suitable capacitance for use on the ePods. I would highly recommend that you measure the caps before installing them to be sure.

JC88: It is recommended that the 0.1uF caps & 100K for R84 are added for both rev 1.1 & rev 1.2 upgrades. These can be purchased at your favorite electronics supply house (assuming "favorite" rules out your local Radio Shack store ;) ).

JoeFloyd: My original post was for the "adventurous" who want to purchase the modules directly from Crucial and do the desoldering/soldering themselves ( maybe that wasn't clear :( ). I assumed that these people would know "what to do". The offer of loose chips was for those who either don't want to hassle with removing the chips themselves or don't want to risk destroying the chips while trying to "perfect their technique". There are tips from myself & others in the other RAM upgrade threads on how to remove the chips.

BTW, the Mosel Vitelic modules mentioned in other threads do NOT have a suitable resistor for R84. The Crucial modules have a resistor which MAY (or may not) work. There is one 47K resistor on the module. The rest of the resistors on the module are far too small to work properly on the ePods. Theoretically, the 47K should work as long as there are either no other pull-up resistors on the CS# line or the existing pull-up resistors are sufficiently large to allow the CS# line to be pulled low by the processor with the 47K installed. I do not know of anyone who has tested a 47K resistor for R84. Reports of smaller resistors were unsuccessful. Reports of 100K were successful. If you actually have tried this, please let us know if it works.


Glitch
Electronics run on smoke, if you let the smoke out they won't work
02-15-2001 21:19:27

New MessageRE:Chip Sources for 32Mb Upgrades (modified 0 times) pete
I haven't as yet ever tried removing cm chips before but want to give
a try. Can u offer any pointers to a novice? On another note what kind of speed increase can I expect with this upgrade. I am currently using terminal client. I plan to also start using more software (ie GPS). I also have installed a 64 meg memory card. What advantage would the 2.12 hack have over the 1.02 easy hack?
02-16-2001 06:42:57

New MessageRE:Chip Sources for 32Mb Upgrades (modified 0 times) tdtd
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I thought you folks would like another success story...

Got an ePods unit with a Rev. 1.1 motherboard. I found the exact same Crucial DIMMs that Glitch found, at about the same time, and I ordered two (just in case I had really bad luck desoldering).

I noticed that there seemed to be two different chip capacitor types for the memory: for each memory chip, there were four of one kind (probably the 0.1 uf ones), and one of a different color. So I didn't use the ones of a different color. I used two soldering irons instead of soldering tweezers to remove the capacitors. To remove the memory chips, I have, from some years ago, a desoldering tip for one of my irons that could cover all the pins of a 16-pin DIP IC at once -- this tip would cover about 22 of the 27 pins on one side of a memory chip. So I desoldered one side of the chip at a time, with _very_ gentle leverage under the chip to lift the leads from the pads using the flexibility of the leads on the other side of the chip. Then I desoldered the other side of the chip. The good part about desoldering is that the leads are already tinned for resoldering onto the ePods board.

The white-knuckle step: I soldered the memory to the ePods board using a fine-tipped soldering iron -- the tip was just barely small enough. I used a cheap head-mounted binocular magnifier (basically a pair of head mounted magnifying glasses) that gave just about enough magnification with no depth of field. I checked the soldering using a 8X loupe (my camera equipment does come in handy).

Attaching the capacitors was harder, because they are so small, and even holding one with tweezers it kept dancing around. I only installed the capacitors for the new memory chips -- there are a few unpopulated capacitor pads for the original memory that I didn't add chips to. Doint it this way there should be just enough components on one DIMM for two full 32KB upgrades.

Finallly the resistor: I found 100K ohm SMC resistors at a local electronic parts store; what I didn't know was that there are more than one size of resistor -- the ones I got were slightly too large. Oh boy! With some swearing and soldering and persistence, I managed to fit the resistor into the space available, and get both ends soldered, but I don't want to do that again... if I convert any other 1.1 boards, I will order the proper size resistors (from Digikey or Mouser or somewhere...)

While I was at it, I added the DOC hack: a pair of wires on pins 22 and 32, run out to a 2-pin header in the battery comaprtment, just in case I screw up the software really well.

The moment of truth -- power up, calibrate the touch screen (that in itself was good to see), and now System Properties reports "Memory: 32200 KB RAM".

In truth, I haven't used the system much in the last two days, but I plan on applying the 2.04 SW hack, and loading up a bunch of stuff (on a 64MB CF card). I may end up using it at work; for the applications that only work on my desktop machine, I may try pcAnywhere...


TDTD
02-19-2001 12:24:46

New MessageRE:Chip Sources for 32Mb Upgrades (modified 0 times) Glitch
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tdtd: I'm glad to here of another successful upgrade.

It is a good thing that you did not use the lighter colored SMD components from the Crucial memory modules. They are not capacitors. I haven't yet taken the time to determine what they are. BTW, there are only enough capacitors on the Crucial module to fully populate one ePods.

BTW, I put up a web site for ePods memory upgrades. I hope to have the picture version of the "How To Upgrade the Memory" up tonight or tomorrow. Any comments on the site would be welcome (be gentle, its my first website).


Glitch
Electronics run on smoke, if you let the smoke out they won't work
02-19-2001 16:37:15

New MessageRE:Chip Sources for 32Mb Upgrades (modified 0 times) duvell
Glitch:

I like the looks of your site! The graphics look like something Frank Lloyd Wright would do.

Thanks for the pointer to the Crucial memory thats compatible with the rev 1.1 boards.

02-19-2001 17:17:55

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