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Kantronics KPC-3+ RAM upgrade to 512K

Discussion in 'Radio Circuits, Repair & Performance' started by AA7BQ, Sep 12, 2004.

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  1. AA7BQ

    AA7BQ QRZ Founder Administrator QRZ Page

    To upgrade the KPC-3+ to 512K RAM the easiest method is to do the following.

    1. Order up a 512K RAM chip from Toshiba, part number TC554001AFT. This is a 32-pin TSSOP package. The DigiKey order number is TC554001AFT-70L-ND and costs about $4.50 USD. This is the 5V version of the chip.
    2. Order up a TSSOP to DIP adaptor. This is DigiKey part number A323-ND and is priced around $11.00 USD.
    3. When the parts come in, solder the Toshiba RAM to the adaptor.
    4. Move the jumper for the RAM setting, J14 on the version I have.
    5. Remove the old RAM, U14 on my version.
    6. Install the new RAM that is on the adaptor. Watch for the pin-1 orientation.

    With this done, I can easily put on the cover; the new RAM is lower than the surrounding parts. And best of all, it end up below $15 USD, less shipping and handling costs.

    Oh, DigiKey's web site is

    Any other questions, feel free to contact me at


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