Pioneer SCSI-2 - Manual (Page 132)

Read Diagnostic Results
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2.29 Read Diagnostic Results (1Ch)
Operation code is (1Ch).
This command requests the drive to return the results of the power-on self test.
The Diagnostic Results data consists of 8-byte parameters as shown in Table 2-28B on the
opposite page.
Parameter Length
The number of bytes of the RECEIVE DIAGNOSTIC parameter excluding itself. This is
fixed to 06h.
ROM Diagnostic
Bit 0 = 1, failure of the SCSI controller ROM.
Bit 1 = 1, failure of the drive controller ROM.
RAM Diagnostic
Bit 0 = 1, failure of the SCSI controller RAM.
Bit 1 = 1, failure of the drive controller RAM.
Data Buffer Diagnostic
Bit 0 = 1, failure of the SCSI controller data buffer.
Bit 1 = 1, failure of the drive controller data buffer.
Bit 2 = 1, failure of the ECC RAM in the drive controller.
Interface Diagnostic
Bit 0 = 1, interface failure between the SCSI controller and the drive controller.
Bit 1 = 1, interface failure between the drive controller and the mechanism.