  The CP-PACS project is a five year plan, which formally started in April 1992
and has been completed in March 1997, to develop a massively parallel computer
for carrying out research in computational physics with primary emphasis on
lattice QCD. The initial version of the CP-PACS computer with a theoretical
peak speed of 307 GFLOPS with 1024 processors was completed in March 1996. The
final version with a peak speed of 614 GFLOPS with 2048 processors was
completed in September 1996, and has been in full operation since October 1996.
We describe the architecture, the final specification, the hardware
implementation, and the software of the CP-PACS computer. The CP-PACS has been
used for hadron spectroscopy production runs since July 1996. The performance
for lattice QCD applications and the LINPACK benchmark are given.
