> "Apple APU. The Model 7811 B Arithmetic Processor Unit is intended to increase the execution speed of Applesoft II programs and the number of math functions available. The system employs an AMD9511 APU and plugs into one of the Apple expansion slots. The CCSoft interpreter is loaded from the diskette provided, and the system is ready to, go. The CCSoft interpreter is identical to Applesoft, except that CCSoft sends arithmetic functions to the APU for fast execution. Additional functions include AsiN(x), ACOS(X), LOGIO(X), SINIH(x), COSH(x), TANH(X), INVERSE(x) and PI. "