RE: SCSI expert needed

From: Peter Krefting <>
Date: Thu, 27 Jan 2011 14:17:32 +0100 (CET)
Message-ID: <>
> The 90x0 uses the "six command bytes" mode only. Knowing that I was able 
> to trace all possible commands send by the Disk Controller to the SASI 
> board. 12 isn't one of them.

Interesting. 12 is one of the few commands that every device must implement, 
at least that is true for SCSI (and the linked SASI spec also lists it as 
"standard", not "optional")...

> I found all the codes so far the 90x0 uses. One of them is $E3 and that
> one is the exception; all others have the $0x format. The only
> explanation is that the group code is %111 and the opcode %00011.

According to the table on page 31 (36), that means it is a group 7 - 
"controller specific diagnostic" - command with the opcode 03h.

> But I also have the command $03. What is the difference?

One is a standard command, the other is a proprietary command. You would 
need the drive's documentation to figure out what that does (or 
reverse-engineer it...).

\\// Peter -

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Received on 2011-01-27 14:00:10

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