This is the reference manual for the Apple IIc and Apple IIc Plus personal computers, encompassing over 700 pages. It contains descriptions of all the hardware and firmware that are used in the Apple IIc family, and provides technical information that hardware designers and programmers need when developing products to be used with Apple Ilc-family computers. The information in this manual is aimed at assembly-language programmers and experienced hardware designers, but others interested in the internal operation of the Apple IIc and Apple IIc Plus can also benefit from reading it.