Path: utzoo!attcan!uunet!yale!mfci!bronson
From: bronson@mfci.UUCP (Tan Bronson)
Newsgroups: comp.os.vms
Subject: Re: chaining RD-disk drives
Message-ID: <406@m3.mfci.UUCP>
Date: 23 May 88 15:20:03 GMT
References: <8805161326.AA15631@ucbvax.Berkeley.EDU>
Sender: root@mfci.UUCP
Reply-To: bronson@mfci.UUCP (Tan Bronson)
Organization: Multiflow Computer Inc., Branford Ct. 06405
Lines: 23

In article <8805161326.AA15631@ucbvax.Berkeley.EDU> SEYMOUR@phast.phys.washington.EDU writes:
>(wait a minute... that's an internal DEC address! what gives?)
>
]to the best of my knowledge, you CANNOT simply "chain" RD-drives
](thanks, DEC).  you need an  RQDXE-AA  or -FA   $250 in last fall's
]
]the inability to "chain" the drives is probably connected with the
]inability to use plain-jane (i.e. cheap) ST-506 drives.  rumor has
]it that the RD-family has the "seek controller" chip on the drive
](instead of making the master controller card do it)....
]
    This is curious, I have two RD53's connected to a SCSI
controller and they work fine. For the price of a cable with
two 34 pin connectors and a second head cable, I would experiment
before I parted with $250.
    Maybe DEC does something like IBM on their PCs and allow
only two drives, by using no encoding the select lines. 

    
Tan Bronson
Multiflow Computer Inc  UUCP(work): {yale,uunet}!mfci!bronson 
175 N Main St 		UUCP(home): {yale,mfci}!bronson!tan 
Branford, Ct 06405	Phone(work):(203)-488-6090 x228