31 Dec
2012
31 Dec
'12
9:20 a.m.
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-
bounces at classiccmp.org] On Behalf Of allison
Sent: 31 December 2012 13:50
To: cctech at classiccmp.org
Subject: Re: Getting an ST-225 disk to work
On 12/31/2012 05:32 AM, Rob Jarratt wrote:
There is no MSCP controller in the MicroVAX2000. IT is a
raw controller
and
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org [mailto:cctalk-
> bounces at classiccmp.org] On Behalf Of Jerome H. Fine
> Sent: 31 December 2012 00:16
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: Getting an ST-225 disk to work
>
> >emanuel stiebler wrote:
>
>>> On 2012-12-30 14:18, Rob Jarratt wrote:
>>> I have a Seagate ST-225 that I want to put into my Micro PDP-11/73.
>>> At the
>>> moment I am just trying to see if the disk works at all and if I
>>> can format it in a MicroVAX 2000. It spins up but the TEST 70 and
>>> TEST 71 commands fail on it, unable to determine the type of disk.
>>> There are some jumpers for which I have found some documentation
here:
5-
> 25-H
>>> H-MFM-S
It must have the termination pack.
If the connectors are inverted that usualy gets a nothing for results.
>>
>>> T412.html, but I am not
sure which is pin 1, and I am not sure what
>>> settings the MicroVAX 2000 wants, or if it needs the resistor
>>> termination pack.
>>
>>> Can anyone tell me which jumper settings I need for the disk
to
>>> work in a 2000? And whether I need the resistor pack installed?
>> AFAIRC, it should have the resistors in, as it is at the end of the
>> cable. And it should be recognized by the TEST70, or it was used on
>> a different system. Is it labeled as a rd31? Probably you have to do
>> a real low level format, entering all the right parameters in the
>> TEST70 yourself .
> Whenever I have used any RD5n or RD3n drive with the
> RQDX3 controller on the PDP-11, the drive always had be be DS3.
>
> I don't know if the MSCP controller is built into the MicroVAX 2000,
> but I suspect that DS3 is so standard with DEC that all MSCP RD3n
> drives must be
> DS3 in a DEC system. system specific. However, it's usefulness is that
it formats any media.
FYI if you know the disk type (RD31 is ST225) that helps.
You still have to have the drive jumpered correctly and more than even bet
unless used on a DEC system it will have to be formatted.
Allison
Indeed, I am hoping to format it, but at the moment when I try that all I
get is this:
>> test 70
KA410-A RDRXfmt
VSfmt_QUE_unitno (0-2) ? 0
VSfmt_STS_Siz .??
VSfmt_RES_ERR #2
84 FAIL
>>
And this is after setting the jumper for DS3 (if I have got my reading of
the jumper orientation correct).
Regards
Rob