DEC and Maxtor MFM drives (was Re: QBUS SCSI controller for RT-11)

From: Jonathan Engdahl <j.r.engdahl_at_adelphia.net>
Date: Wed Feb 26 22:19:00 2003

Correct. And thus it is not natively supported by the PDP-11 RQDX3
formatter. But if you hack ZRQCH0, it belives it *is* an RD54, with only 918
cylinders. You can then format it. When you hook it up to a BSD system,
everything works great, because the drive parameters are on the first track,
and the RQDX3 does the right thing. It's only 112 megs instead of 150, or
something like that, but it's plenty of room for BSD, and a lot bigger than
any other drive that's supported by the RQDX3, other than the RD54 itself.

see http://users.safeaccess.com/engdahl/xxdp.htm

--
Jonathan Engdahl
http://users.safeaccess.com/engdahl
"The things which are seen are temporary,
 but the things which are not seen are eternal."  II Cor. 4:18
----- Original Message -----
From: "Eric Smith" <eric_at_brouhaha.com>
To: <cctalk_at_classiccmp.org>
Sent: Wednesday, February 26, 2003 8:44 PM
Subject: DEC and Maxtor MFM drives (was Re: QBUS SCSI controller for RT-11)
> Johathan Engdahl wrote:
> > I have been able to use an XT1140 in place of an RD54,
>
> Note that the XT1140 only has 918 cylinders, while the RD54 (a
> Maxtor XT2190) has 1224 cylinders.

Received on Wed Feb 26 2003 - 22:19:00 GMT