Got something 
http://www.ibm.com/support/knowledgecenter/SSLTBW_2.2.0/com.ibm.zos.v2r2.idai200/dvtt.htm


--------------------------------------------------------------------------
Lionel B. Dyck (TRA Contractor)
Mainframe Systems Programmer 
Enterprise Infrastructure Support (Station 200) (005OP6.3.10)
VA OI&T Service Delivery & Engineering


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf 
Of John Eells
Sent: Thursday, September 22, 2016 1:48 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: [EXTERNAL] Re: Translating a DEVTYPE from LISTC into something usable?

Some other trivia about DEVTYPE in catalog entries...

The first two bytes are "feature" bits.  For modern disk, it will always be 
x'3010'.  These bits represent obsolete and now-standard functions that were 
once features, namely burst mode (obsolete), data chaining (now standard), and 
rotational position sensing (now both standard *and* obsolete!).

The next byte is the device class, x'20' for direct access.

The last byte, represents the device, and as others have posted x'0F' is set 
for 3390.

(Wayne Rhoten had the feature bit mapping when I looked for this a couple 
months back!)

--
John Eells
IBM Poughkeepsie
ee...@us.ibm.com

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