[pups] Disk query on Ultrix 3.1

[pups] Disk query on Ultrix 3.1

[Fred N. van Kempen]

Kevin,

> I am using an 11/83 with an Emulex UC07 Qbus-SCSI card.  At present I have
a
> Seagate ST4767N disk attached.  The emulex card emulating an MSCP drive I
> believe.
Nice, I have one too (an UC08, which is just a dual-port version of the '7).

> I am sure I could also find a higher capacity drive without 
> too much effort.
Yup.. come to Holland, attend one of the 6-weekly "dump" shows, and find
yourself
loaded with 1 and 2GB drives for a couple of bucks...

> Which disk should I tell the Ultrix installation I have to get the best
from
> my setup.  I made an 'educated' guess of RA81 for the moment, and that
> works.
Ultrix will think it is an RA81, most likely.  The controller will be seen
as
either an RQDX3 (MFM QBUS) or an UDA50 (MFM Unibus).  Never tried that, 'cos
the
controller is still on my "todo shelf".  Drives attached to either will
report
as RAxx'es... 

> I could physically attach a drive with a much higher capacity 
> than DEC ever envisaged, but which drive do I 'pretend' I am using.
I have a kernel with "RA99" compiled in.  That is a test for my experimental
support for Ultrix-32-like "partition tables" (/etc/chpt et al).  Works OK
so far...

Anyway.  Uhm, your drive most probably should work fine when referred to as
an RA81 on an RQDX or similar.. UDA50 comes to mind.

Cheers,
	Fred


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From: Johnny Billquist <bqt@update.uu.se>
To: "Fred N. van Kempen" <Fred.van.Kempen at microwalt.nl>
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Subject: RE: [pups] Disk query on Ultrix 3.1
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On Fri, 23 Mar 2001, Fred N. van Kempen wrote:

> Kevin,
> 
> > Which disk should I tell the Ultrix installation I have to get the best
> from
> > my setup.  I made an 'educated' guess of RA81 for the moment, and that
> > works.
> Ultrix will think it is an RA81, most likely.  The controller will be seen
> as
> either an RQDX3 (MFM QBUS) or an UDA50 (MFM Unibus).  Never tried that, 'cos
> the
> controller is still on my "todo shelf".  Drives attached to either will
> report
> as RAxx'es... 

Actually, the UDA-50 isn't MFM, it's SDI. The QBUS equivalent is the
KDA-50.

There is no MFM controller for Unibus. That is, no equivalent of the RQDXn
exists for Unibus.

Disks on the RQDXn reports as RDxx or RXxx, while disks on the [KU]DA-50
reports as RAxx (from a hardware point of view). They're both MSCP
controllers though.

	Johnny

Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt at update.uu.se           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol


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From: "Fred N. van Kempen" <Fred.van.Kempen@microwalt.nl>
To: "'Johnny Billquist'" <bqt at update.uu.se>,
        "Fred N. van Kempen"
	 <Fred.van.Kempen at microwalt.nl>
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Subject: RE: [pups] Disk query on Ultrix 3.1
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Johnny,

> Actually, the UDA-50 isn't MFM, it's SDI. The QBUS equivalent is the
> KDA-50.
Ahhh, i knew it was something-50 :)  Twas a while ago since I 
last touched a Unibus box.. can you tell? :)

> Disks on the RQDXn reports as RDxx or RXxx, while disks on 
> the [KU]DA-50
> reports as RAxx (from a hardware point of view). They're both MSCP
> controllers though.
Yup.  The UC0x talks MSCP (and/or TMSCP, if configured) on the Qbus
side, and SCSI on the device side.  I have an UC08 which is configured
for MSCP on bus 0, and TMSCP on bus1.  The attached Exabyte 8200 (2GB)
is seen as a giant TK50 :)

That was on the MVII, though.. havent used it since.  Was going to
put it in the 11/83, _if_ I can find a BA123. Anyone got one of those
laying around? :)

Cheers,
	Fred


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