Quantum 1200 Series DAT Autochanger Guía de usuario Pagina 225

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SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands
81-81200-02 REV A01 January 2005 4-183
4.17 READ BUFFER Command (3Ch)
The READ BUFFER command is used with the WRITE BUFFER command as a diagnostic function
for testing the SDLT tape drive’s data buffer for possible diagnostic data and for checking the integrity
of the SCSI bus. Buffers 01h and 02h provide a diagnostic capability for the drive’s firmware, buffer
03h is used to read the DMARK table, and buffers A1h and A2h provide access to diagnostic error
information.
Figure 4-95. READ BUFFER Command Descriptor Block — Data Format
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (3Ch)
1 Reserved Mode
2 Buffer ID
3 – 5
(MSB)
Buffer Offset
(LSB)
6 – 8
(MSB)
Allocation Length
(LSB)
9 Comp Control
SDLT 600
SCSI Interface Guide
SCSI Commands
81-81200-02
REV A01
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