INFORMATION PROCESSING SYSTEM

摘要

In the process of returning to a series of processes for returning to a normal operation mode, an I/O address showing a change line status register of the FDC is set to a stored register of the trap logic. When the process returns to the normal operation mode and then an access to the first status register is trapped, a change line status flag value is rewritten. The faked OS/driver invalidates the floppy disk allocation information in the main memory.