Here's a link to a "CF" on a Plus as well as a Mac Portable. It's the Google Translation to the Japanese site, so once there, scroll down to the CF Card with 1GB ... entry.

http://translate.google.com/translate?u=http%3A%2F%2Fwww.mactechlab.jp%2FOld%2520Mac%2Fpage3.html%23CFDrive1GB&langpair=ja%7Cen&hl=en&ie=UTF-8

This is the original Japanese direct link:

http://www.mactechlab.jp/Old%20Mac/page3.html#CFDrive1GB