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I'm having trouble determining whether I need one of these (subject line) to install a Pentium 233 MMX in my IBM PC 350, Model # 6587 mobo, currently running a P133. I've thoroughly plowed through IBMs site and am still uncertain whether the board supports the split voltage that I gather is required. Any advice on where to find this info would be much appreciated. Thanks in advance for any answer.

On a related note... This same machine shipped with either a 16 or 32 MB, 168 pin, 5volt, EDO DIMM. I have the 16. The intended memory upgrade was to fill two or four of the 4 72 pin SIMM slot with EDO SIMMs. I have four 16s in those slots. I would like to upgrade the DIMM rather than the SIMMs, if I can determine the maximum supported size. IBM offered only 16 and 32MB DIMMs and continues to list only the part #s that correspond to those modules. I've done a lot of Google searches and can't find any info on larger DIMMs in this machine.

You can buy 64 & 128MB, 168 pin, 5 volt EDO DIMMs (non parity, which is what the current RAM is ). These modules are designed for PCI Power Macintoshes from the pre G3 era. Anybody know if I can use these in my IBM or will it not recognize it all, assume it to be 32 MB etc ? Also, will it recognize 64 MB, 72 pin SIMMs and use all 64 MB or is 32 it ? Thanks again and sorry for talking RAM in the CPU section.

Regards,

MJF

Well, I fixed that minor problem and added “memory” to this forum…

It's the IBM PC 350 family, 6587 Machine Type, and the Model is? Should be a combination of three letters/numbers. See http://www.pc.ibm.com/qtechinfo/MIGR-4RZLS4.html?lang=en_US&page=brand&brand=IBM+PC%7CPC+350%7C6587%7C50T&family=IBM+PC%7CPC+350&machineType=IBM+PC%7CPC+350%7C6587&model=IBM+PC%7CPC+350%7C6587%7C50T&doctype=Hot+news&subtype=All&up=%3Flang%3Den_US%3Flang%3Den_US
Larry

The sticker on the front panel (of IBM PC 350) says...6587-79T.

Regards,

MJF

PC 350 6587 79T

The technical support manual is at ftp://ftp.pc.ibm.com/pub/pccbbs/commercial_desktop/s78h5083.pdf

Acrobat Reader Page 13: “The system board operates with a 3.3 volt microprocessor.”

Acrobat Reader Page 14: “The maximum amount of system memory is 192 MB.

Figure 3. System Memory Speed and Size
Type Speed (ns) Size (MB)
SIMM 60 4, 8, 16, 32
DIMM 60 8, 16, 32, 64

Extended data output (EDO), nonparity memory is standard.
Fast page mode (FPM), 60 ns parity memory is provided in the memory subsystem.”

Memory configuratin is on the following page. Larry

>PC 350 6587 79T
>
>The technical support manual is at
>ftp://ftp.pc.ibm.com/pub/pccbbs/commercial_desktop/s78h5083.pdf

Thanks for the link, couldn't find that.
>
>
>Acrobat Reader Page 13: “The system
>board operates with a 3.3
>volt microprocessor.”
>
Hmmm, so what's the best place to buy the voltage converter, Powerleap... somewhere else ? Any recommendations.

No recemmendations except that I would buy a new motherboard and a faster CPU. Larry

I have dug through powerleap's site. It seems to me like they are a pretty shady orginization, whenever you add one of their products to the shopping cart, it asks you if you want to buy three other products and you have to click 'no thanks' on all of them... If you are confident that you can run the system on that slow memory you have, go for it... Otherwise shell out 300 bucks and get a duron 750, a nice case, memory and a video board.

>I have dug through powerleap's site.
> It seems to me
>like they are a pretty
>shady orginization,

Kinda had the same impression. they aren't too clear about what's include with their upgrade package either...

> If you
>are confident that you can
>run the system on that
>slow memory you have,

Not confident enough. I think I'll just go with an overdrive P200 MMX that runs on 3.3 volts mobo voltage without an adapter. Anyone have any input on how overclockable the already "overdrive" 200 MMx is. They're going for around $30 these days, brand new, in the box, on ebay. More cost effective methinks.

> go
>for it... Otherwise shell out
>300 bucks and get a
>duron 750, a nice case,
>memory and a video board.
>

Down the road a bit that's the obvious solution. I'm *mainly* a Mac user. i just want to keep my one PC sorta up to date/functional for *most* things. Thanks Guys.

MJF

>
>> If you
>>are confident that you can
>>run the system on that
>>slow memory you have,
>
>Not confident enough. I think
>I'll just go with an
>overdrive P200 MMX that runs
>on 3.3 volts mobo voltage
>without an adapter. Anyone
>have any input on how
>overclockable the already "overdrive" 200
>MMx is.

Put that old overdrive 200 MMX (along with some
RAM) on there. Helped a lot. I'm curious if I can accelerate the bus speed from 66 MHz to 75 MHz. Switches on the motherboard seem to allow for only a 3x Max multiplier. There's gotta be a way to put a new crystal in this thing somewhere

I've taken the soldering iron to most of my Macs (only destroyed one out of six so far) and would do so with this machine if I could find a little direction. There is a good deal of information about overclocking Mac motherboards out there but nothing that I can find about this old board. Does anyone know if this info is out there ?

Thanks in Advance

I doubt that the memory would take 75 MHz. The board is probably four or more layers. Yu may be able to get the pin-outs of the chipset on Intel’s site. Be advised that soldering irons and chipset connections don’t get along very will. I have destroyed more than one of them—just plain melted the connections into thin air. Larry

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