IBM Think Pad upgrade

Discussion in 'Computers, Hardware, and Operating Systems' started by WA9SVD, May 11, 2012.

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  1. WA9SVD

    WA9SVD Ham Member QRZ Page

    I use an IBM THinkPad T22 for Amateur Radio applications' Windoze XP Pro with latest updates.
    The original memopy was 128 MB, upgraded with an additional 128 MB when I bough the machine. The service manual says it will take a maximum of 512 MB, and the modules listed state SD-RAM, PC-133 as upgrades.

    I purchased a 512 MB SD-RAM PC-133 module through Amazon, and it won't work! If I install the single module, I just sat a series of three beeps, with no boot up. If I add the module with one of the original modules, I don't even get the beeps. I noticed that the original memory (ine original from IBM, and one from INfineon, were both PC-100 modules.l
    Do the SD-ROM modules need to be installed in pairs? Or is the 512 MB module I received defective? I realize even 512 MB is barely enough to support XP, but it's far better than only 256 MB.
  2. K4NYA

    K4NYA Ham Member QRZ Page

    I'll bet they do need to be installed in pairs. Most RAM nowadays does.
  3. WA9SVD

    WA9SVD Ham Member QRZ Page

    Apparently not. Remember, this is SD-RAM. The machine works with ONE <128MB> module installed; although it came with two <128 MB> modules installed. (One of the modules is an aftermarket product.) Originally, the OEM product from IBM shipped with a single 128 MB module. I presumed the machine would show a modicum of improved performance with 512 MB of memory. oer its current 256 MB. (Barely suitable for Win XP.) . The strange thing is that IBM specified PC-133 memory up to a single 512 MB module, but the original memory modules were all PC-100. I suspect the new module may be defective.
    Last edited: May 11, 2012
  4. AC0H

    AC0H Ham Member QRZ Page

    Double check the BIOS on the machine and ascertain if it will support PC133...just in case.
    If you try and mix PC100 and PC133 the memory will only run at the PC100 rate.
    I'm betting on a bad SIMM.
  5. WA9SVD

    WA9SVD Ham Member QRZ Page

    'm now thinking about a bad SIMM. The IBM Service manual specifies PC-133 modules, with a 512 MB maximum,) and the 128 MB modules worl individuals as well together. They ARE PC-100 mudules, even if that's what's spec'd by IBM in their service manual. The 512 MB /PC133 module won't work in any configuration. I'm now leaning to a memory module failure.
  6. WA9SVD

    WA9SVD Ham Member QRZ Page

    There's nowhere in the BIOS that specifies the type of memory for the laptop. If the SIMM is defective, then it will be returned. I'd even rather run aPC-100 run at it's proper speed if I can get the memory upgraded. But if IBM spec's PC-133 memory, I'd think the replacement would have been acceptable,and operate as well.

    Obviously, the PC-133 SHOULD function properly, as spec'd in the IBM service manual. Id didn't not.
  7. KD5SPX

    KD5SPX Ham Member QRZ Page

    To get 512mb you must install 2 x 256 mb modules.
  8. WA9SVD

    WA9SVD Ham Member QRZ Page

    Then why does IBM designate a single, 512 MB PC-133 module as a suitable "FRU" (Field replaceable Unit) for this particular laptop? IBM states that 512 MB is the maximum it can handle. and lists a 512 MB / PC-133 module as an upgrade option. Or at least so says the service manual; there's NO mention of the need to install memory modules in pairs.

    Single memory modules (such as the 128 MB module that was part of the OEM machine) work fine without being paired with another module.

    Please state your reasoning or experience to the contrary. My QUESTION is whether current "PC-133" memory may not work in this situation, or if the memory module is defective.
  9. AC0H

    AC0H Ham Member QRZ Page

    Turns out SPX is right.
    The T-22 will take PC-133 and a max of 512MB but it has to be a pair of 256MB SIMMs.

    At least according to Crucial.
  10. WA9SVD

    WA9SVD Ham Member QRZ Page

    I would tend to think IBM would know more of what the machine needs than an aftermarket memory company. It's just strange that IBM specifies PC-133 memory in the Service module, but they installed a single (128 MB) PC-100 memory module from the factory.
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