Fast online track finding for the muon trigger in the UA1 experiment

A microprocessor system will be used to trigger on high energetic muons in the UA1 experiment. The system consists of MC 68000 microprocessors. Six of them work in parallel for a first online track finding and one as supervisor to take the final trigger decision. To reduce the input rate for the microprocessors, very fast prefiltering is done by a specially constructed hardware trigger. (0 refs).