We built a data acquisition system for the BELLE experiment. The system was
designed to cope with the average trigger rate up to 500 Hz at the typical
event size of 30 kB. This system has five components: (1) the readout sequ
ence controller, (2) the FASTBUS-TDC readout systems using charge-to-time c
onversion, (3) the barrel shifter event builder, (4) the parallel online co
mputing farm, and (5) the data transfer system to the mass storage. This sy
stem has been in operation for physics data taking since June 1999 without
serious problems. (C) 2000 Published by Elsevier Science B.V. All rights re
served.