Operation status of EPICS IOC works on various systems in KEKB accelerator control system

At the KEKB, many accelerator equipments are controlled by EPICS based control system. EPICS(Experimental Physics and Industrial Control System) is a toolkit to construct control systems. At the time of KEKB operation started, EPICS IOC(Input Output Controller) could execute on VxWorks OS only. So we use VME computers with VxWorks OS as IOC. However, recently, EPICS IOC is able to execute on multi-platform, for example, Linux, Windows and Mac OS X.We introduced EPICS IOC which worked in not only VME computer with VxWorks but also Linux PC, PLC CPU with Linux and Windows-based Oscilloscope. In this paper, we will present status of EPICS IOC works on various systems in KEKB. (author)