Kantronics KPC-3+ RAM upgrade to 512K

[AA7BQ]

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 http://www.digikey.com.

Any other questions, feel free to contact me at derek@dkoonce.com.

Derek
KE6JTP



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