User's Guide

Chapter 3 Emulated DLT7000 SCSI Commands
Read Buffer (3Ch)
234 Quantum DX-Series Software Interface Guide
Read Buffer (3Ch) 3
The READ BUFFER command is used in conjunction with WRITE
BUFFER as a diagnostic function for testing the drive’s data buffer for
possible diagnostic data and for checking the integrity of the SCSI bus. In
addition, by using buffers 1 and 2, the READ BUFFER command allows
the contents of the tape system’s local RAM/EEPROM, and DRAM to be
transferred over the SCSI bus. Buffers 1 and 2 provide a diagnostic
capability for the system’s firmware.
Table 183 READ
BUFFER Command
Descriptor Block -
Data Format
Bit/Byte 7 6 5 4 3 2 1 0
0
1
2
3-5
6-8
9
Operation Code (3Ch)
Logical Unit Number Reserved Mode
Buffer ID
(MSB)
Buffer Offset
(LSB)
(MSB)
Allocation Length
(LSB)
Unused Reserved
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