>> While this is an RO200 series I don't know which one.
> Do you know if it's an 200E-series drive or a plain old 200
> series?
It seems to be a plain old 200 series, at least the label says
RO 200 series and not RO 200E series. No model number anywhere
though.
> Capacity seems to be dictated by number of heads (which you
> can count with the lid off!)
Curses! I didn't count and I don't want to open it up again
unless I have to. I do remember that it is 'full' of platters
though, and there is an arm to each surface. It's the first
time I've seen a full height drive without room for an extra
platter or two.
Cheers,
Lee.
.
___________________________________________________________
To help you stay safe and secure online, we've developed the all new Yahoo! Security Centre. http://uk.security.yahoo.com
I've recently acquired a TORCH-725 which has this RO200
series hard drive in it, trouble is when I took everything
out of the TORCH case for first inspection I heard something
'ting' off one of the platters in the drive. Opening it up
to have a look, well a little dust can't be as bad as debris
that goes 'ting', I found a 12mm long 2.7mm dia. roll pin
lying in one corner. Anyone have a clue where this may have
come from? Dare I power the drive without it? This may
eventually be the only option if I can't re-install the pin.
While this is an RO200 series I don't know which one. The
series seems to run from 5MB to 40MB and I'd like to know
which one this is likely to be.
Assuming this drive needs to be replaced can I use a 40MB
SCSI drive on the Torch SCSI board and bypass the SCSI to
ST506 interface? This would be the prefered eventual solution
as I have a few 20MB to 200MB SCSI drives I could use.
Cheers,
Lee.
.
___________________________________________________________
To help you stay safe and secure online, we've developed the all new Yahoo! Security Centre. http://uk.security.yahoo.com
Hello,
Does anyone have any Atari ST disks that you can send
me?
I have a 520ST, but I don't have a single diskette for
it.
Thanks!
Steve in Southern California.
____________________________________________________
Start your day with Yahoo! - make it your home page
http://www.yahoo.com/r/hs
>> On Saturday 13 August 2005 19:38, Al Kossow wrote:
>> If you use XXDP, you want a copy of this.
>>
>> http://www.bitsavers.org/pdf/dec/pdp11/xxdp/
>> PDP11_DiagnosticHandbook_1988.pdf
>
> Al,
>
> What a great manual!!! This will save hours of rummaging through XXDP
> listings to find switch settings!
>
> Thanks,
> Lyle
Ditto what Lyle said. This manual has everything spelled out. I won't have
to scratch my head any more trying to figure out how to run the XXDP
diagnostics with a blindfold on. Thanks Al !!!
Ashley
I mentioned this on the list a long time ago - found it at a salvage place.
I wasn't in any rush to get pictures, but last time I was there they said
the place was going to be declared off-limits for humans. So I got a few
pictures of this olive drab "computer". Anyone have any clue what this thing
is? Just curious!? If anyone wants it I could put them in touch with the
salvage place owner.
Pictures are at www.ezwind.net/jwest/whatsit
Jay West
der Mouse <mouse at rodents.montreal.qc.ca> wrote:
> Sending a FORMAT UNIT command isn't enough?
It's *supposed* to do a true LLF on a Classic HDD, but I very strongly
suspect (close to certainty) that on modern drives it's a dummy, something
like "write zeros to all logical blocks" as if by ordinary writes.
They probably have stuff like embedded servo (a la RL02) and cannot
be LLFed "from scratch", i.e., from a totally degaussed or misaligned
state.
MS
I have a disk drive - a (relatively) modern sealed unit - which appears
to have mechanical trouble. The noise it makes spinning up says to my
ear "bearing friction".
I'm considering taking it apart and lubing the bearing. Of course,
this would at best be a temporary fix, since it is on its way out at
this point; this is more to gain experience on a throwaway device than
to actually recover the drive. (All the bits from it are safe; live
mirroring is great for that.)
Any tips from the collective wisdom? Obviously, I want to do this in
as close to a cleanroom as I can reasonably find, and have the platter
assembly open as short a time as I can. But I don't, for example, have
any idea what would be a suitable lubricant to use - assuming the
bearing isn't a totally sealed assembly itself....
ObOTness thread: the disk itself may be formally on-topic; it's
certainly close to - it is stamped "MAR 31 1996".
/~\ The ASCII der Mouse
\ / Ribbon Campaign
X Against HTML mouse at rodents.montreal.qc.ca
/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
> -----Original Message-----
> From: Al Kossow <aek at bitsavers.org>
> Sent: Aug 17, 2005 12:30 AM
> To: classiccmp at classiccmp.org
> Subject: PDP11 stuff in OZ
>
> If someone is nearby..
>
> http://www.psych.usyd.edu.au/pdp-11/equip_list.html
If anyone is in Australia and is willing to collect and ship
some items to the USA for me, I will be glad to pay you
for your time and effort. I have attempted to contact the
owner of these items but have not received a response.
I would very much like to have the spare 11/40 CPU set
since I have both a functional 11/40 and 11/35, as well
as a sick 11/35. My 11/40 is part of a historic functional
display of a 1970s timesharing academic computer center
and I would like to be able to have spares to keep it up
and running.
If anyone in Australia is willing to help, please contact
me off-list at wacarder at usit.net.
Thanks,
Ashley
I've scanned some documents for the LGP-21 (peripheral options, diagnostic
programs etc.) and put them on our ftp server:
ftp.informatik.uni-stuttgart.de/pub/cm/lgp21/docs
There's a readme file in each directory.
Christian
An early example of a bit banger serial interface was the Motorola 6800
MIKBUG Monitor ROM. It used a parallel interface chip (MC6820 PIA) as a
bidirectional serial interface. It would work at 110 and 300 baud (some
people clocked it at 1200 baud.) This was the used in original (1975)
Southwest Technical Products 6800 computer. Motorola had a real UART (MC6850
ACIA) at the time so I don't know why Motorola did this. SWTPC later
switched the their own Monitor ROM and a MC6850 serial port.
http://www.swtpc.com/mholley/swtpc_6800.htm
Michael Holley
