Subject: Re: Dual disk BA23's
To: None <PORT-VAX@NETBSD.ORG>
From: None <PORTVAX@trailing-edge.com>
List: port-vax
Date: 01/27/2000 12:56:53
>> As I think I hinted at in a previous message, there is a problem with
>> power-supply overload.  My experience was that the power supply in the
>> BA23 does not have the capacity to run the CPU and the memory and the
>> video board, and start two disk drives.  At least drives of the vintage
>> MaxTor 8380 and 8760.  Once the drives are running, then it's OK.  A
>> sequenced startup does the trick.

>Well mine has been doing it for 10 years and the drives are RD54 and RD53
>(MAxtor 2190 and Microplus 1325).  The box is stuffed to teh physical
>limit. I would advise if you can sequence the drives it's a good thing
>but, neither of those MFM drives have that capability.

There are significant power issues with stuffing a BA23 to the max,
and many of us here have seen smoked and charred power supply harnesses
and connectors that attest to some of these limits.  See the wiring
harness FCO details in third-party-disks.txt if you aren't sure
that you're up-to-date.

-- 
 Tim Shoppa                        Email: shoppa@trailing-edge.com
 Trailing Edge Technology          WWW:   http://www.trailing-edge.com/
 7328 Bradley Blvd		   Voice: 301-767-5917
 Bethesda, MD, USA 20817           Fax:   301-767-5927