Take a look at the freely available MegaMemo

Take a look at the freely available MegaMemo. "MegaMemo is a PalmOS app that was written to overcome the 4K limitation on Memo Pad memos - allowing memos up to 32767 characters. Additionally, memos written using MegaMemo can be printed directly from MegaMemo if you have PalmPrint installed. MegaMemo can also export its memos to Memo Pad. If the memo is longer than 4095 characters, only the first 4095 characters are saved."