Here is the Jackson Harbor Press announcement, posted to QRP-L, introducing an enhanced keyer chip for the Rock-Mite:
From: jacksonharbor...
To: "Low Power Amateur Radio Discussion"
Subject: [AD]  New keyer chip for Rock-Mite
Date: Friday, November 15, 2002 7:32 PM

Fellow Rock-Miteers:

Jackson Harbor Press is happy to present a new keyer chip for the Rock-Mite 
series of transceivers from Small Wonder Labs.  This new chip has a number of
features but the two most important:

 - two 60 character, non-volatile memories
 - optional pot speed control

One 10k pullup resistor (included) MUST be added to the Rock-Mite for the
RMK chip to function correctly.  Also, two other resistors (included) and
a pot (NOT included) must be added for pot speed control.

The chip price is $4 plus $2 s/h in the USA - DX, add $3 to USA price.

For more information and to order, see the manual and other docs at:
Thanks and
Best Regards,

Chuck Olson, WB9KZY
Jackson Harbor Press