| 摘要 |
PURPOSE:To discriminate easily the generating source of an access error by providing a control table setting up I/O device identifying information in a storage part, and using an access-exclusive bus line in a common bus to access the control table. CONSTITUTION:An address in a memory 4 is selected by address data Z in an address register 8 of a channel device CH0 and data F in the memory 4 are written in a disc 10 through a bus 9. If a writing error is generated, an error signal is informed to a processor 1. A discrimination part 12 checks the bits B6, B7 of a register 13 and extracts a identification code I'0 in the control table 6 through a common bus 3. Consequently, the generating source of an access error generated at the time of memory access can be easily discriminated. |
