Re: z series channel commands



In a message dated 6/20/2006 8:11:03 A.M. Central Daylight Time,
lieven_bo@xxxxxxxxx writes:

Any idea where i can find the I/O command codes esp. the magnetic tape
channel commands?
From the subject of your post, "z series channel commands,", the literal
answer is in the z series Principles of Operation book, but since you mention
magnetic tape commands you probably are not interested in what is in the PoOps.
You need to determine the control unit model number that supports whatever
device you have in mind, then look on the IBM publications website for a
document titled something like "XXXX Control Unit Reference", where "xxxx" is the
model number. E.g., a recently delivered IBM DASD control unit model number
is 2105. I don't know what the latest tape controllers are. Unfortunately,
the 2105 book has less CCW info in it than the previously announced 9340
DASD controller, so technical documents do not always have more and more info in
them as time goes on. After you find the book you want, you can probably
download a copy of the book or at least an url to take you to the info you
want. If you don't know the control unit's model number, then search for the
device's model number, look in that book, and see to what types of controllers
the device can be attached. The CCW command codes have always been documented
by IBM in their control unit books rather than the books that describe
devices. The website is
_http://www.elink.ibmlink.ibm.com/public/applications/publications/cgibin/pbi.
cgi?CTY=US&&FNC=SRH_
(http://www.elink.ibmlink.ibm.com/public/applications/publications/cgibin/pbi.cgi?CTY=US&&FNC=SRH) &

Bill Fairchild




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