This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
There is only one ROM in the IIc+: it is probably 32KB in capacity, like the UniDisk revision of the IIc and later IIc models, hence it would be a 28 pin chip. Assuming the SmartWatch works in the IIc+ (and I don't know of any reason why it wouldn't), you need to put it under the chip labelled "Monitor ROM". Make sure you get it around the right way! One other point: I hope you got the right variety of the SmartWatch. The part number should be DS1216E. The letter suffix indicates the type of chip which the SmartWatch works under, with "E" being a 28-pin ROM. The suffix should be printed in the form of a large green letter (silk screened) on the small circuit board which is visible beside the DS1216 chip inside the SmartWatch. By: David Empson