Yeah, there were a few CDC drives like that ... I encountered a few "Hawk"
drives once on an old Alpha Micro S-100 machine long ago; I believe it
was, five megs fixed, five megs removable?
The pack was about the size of a garbage can lid and I believe the unit
spun them up to around 2400 RPM or s
> tony duell [mailto:a...@p850ug1.demon.co.uk] wrote:
>
>Is the KLESI printset on-line anywhere?
The schematics are online (sounds like they've been found now), but that
only tells you the electrical interface between the controller and the
drive. That part's pretty simple (which is why it loo
Bob
Take a look at the tu81 manual on bitsavers ek_tu81-tm_002_nov85.pdf
The appendix describes the m8739 unibus klesi. It's tmscp but it applies to
mscp as well.
Joe
On Jun 8, 2015, at 9:27 AM, "Robert Armstrong" wrote:
>> tony duell [mailto:a...@p850ug1.demon.co.uk] wrote:
>>
>> Is the KL
> Ethan Dicks [mailto:ethan.di...@gmail.com] wrote:
>I suppose if you found a way to wedge the upper and lower arms of
> the removable cartridge so the heads weren't damaged, ...
I think it's even harder than that - the firmware in the drive will spin down
if it thinks the removable cartridge i
> The RC25 was one of the last cartridge drives (before fixed drives came back
> in small sizes and exploding
> capacity), somewhat interesting because of its compact size, and very odd and
> hard to use because the
> designers threw in a fixed platter. Perhaps they thought that it was a good
> On Jun 8, 2015, at 07:26, Mike Ross wrote:
> Hmmm IBM used exactly the same trick - removable platter, with a fixed
> platter below it - in 1969 with rather larger platters on their 5440
> disk for the System/3... I have one of these; have had various things
> to fix (some still unfixed!) but t
On Tue, Jun 9, 2015 at 2:06 AM, Paul Koning wrote:
>
>> On Jun 8, 2015, at 10:02 AM, Mike Ross wrote:
>>
>>> ...
>>
>> Ugh OK, I've never laid hands on one as I said; for some reason I
>> thought the cartridge on these was a sealed unit containing the heads,
>> like some IBM drives, e.g. 3340…
>
> On Jun 8, 2015, at 10:02 AM, Mike Ross wrote:
>
>> ...
>
> Ugh OK, I've never laid hands on one as I said; for some reason I
> thought the cartridge on these was a sealed unit containing the heads,
> like some IBM drives, e.g. 3340…
No, and I don’t think DEC ever made any drives like that.
On Mon, Jun 8, 2015 at 2:22 PM, Ethan Dicks wrote:
> On Sun, Jun 7, 2015 at 9:44 PM, Mike Ross wrote:
>> That should be trivial. I've never laid hands on an RC25, but there
>> must be a microswitch that detects when a cartridge is installed, and
>> is accessible for bodging...?
>
> The problem is
On 2015-06-08 07:50, ben wrote:
On 6/7/2015 11:08 PM, tony duell wrote:
That should be trivial. I've never laid hands on an RC25, but there
must be a microswitch that detects when a cartridge is installed, and
is accessible for bodging...?
Yes, and don't do it!
In every fixed/removeable dri
On 6/7/2015 11:08 PM, tony duell wrote:
That should be trivial. I've never laid hands on an RC25, but there
must be a microswitch that detects when a cartridge is installed, and
is accessible for bodging...?
Yes, and don't do it!
In every fixed/removeable drive I have worked on (OK, never an
> That should be trivial. I've never laid hands on an RC25, but there
> must be a microswitch that detects when a cartridge is installed, and
> is accessible for bodging...?
Yes, and don't do it!
In every fixed/removeable drive I have worked on (OK, never an RC25, but...)
the heads for both the
On Sun, Jun 7, 2015 at 9:44 PM, Mike Ross wrote:
> That should be trivial. I've never laid hands on an RC25, but there
> must be a microswitch that detects when a cartridge is installed, and
> is accessible for bodging...?
The problem is if you would do that, the heads on the empty cartridge
woul
On Fri, Jun 5, 2015 at 3:56 PM, Robert Armstrong wrote:
>>Ethan Dicks [ethan.di...@gmail.com] wrote:
>>did not come with a removable cartridge so I've not been able to spin it up
>
> Yes, one of the annoyances of the RC25 is that you can't spin it up w/o the
> removable platter in place. I hav
I found a file in my archive I got somewhere... I thought it was bitsavers.
Mp01876_klesi_engrdrws_aug84.pdf
Joe
> On Jun 7, 2015, at 1:03 PM, tony duell wrote:
>
>
>> it's true very little LESI documentation escaped...But the klesi schematic
>> did. and it's well commented. lots of descriptiv
I downloaded the rc-25 set from bitsavers. The klesi (q and u) prints were at
the end.
Joe
> On Jun 7, 2015, at 1:03 PM, tony duell wrote:
>
>
>> it's true very little LESI documentation escaped...But the klesi schematic
>> did. and it's well commented. lots of descriptive signal names. The
>
> it's true very little LESI documentation escaped...But the klesi schematic
> did. and it's well commented. lots of descriptive signal names. The
> hardware to interface to it is almost trivial. I took a couple of hours
> looking over the schematic and have written a couple of pages describing
>
it's true very little LESI documentation escaped...But the klesi schematic
did. and it's well commented. lots of descriptive signal names. The
hardware to interface to it is almost trivial. I took a couple of hours
looking over the schematic and have written a couple of pages describing
how to make
On 2015-06-05 2:05 PM, Ethan Dicks wrote:
On Fri, Jun 5, 2015 at 1:52 PM, Ian S. King wrote:
The UC07 manual on Bitsavers shows this as a Qbus adapter - although I'd
sure think it was Unibus from the name. The seller calls it out as Qbus
and the documents back him/her up.
Yeah. I have one.
On Fri, Jun 5, 2015 at 1:52 PM, Ian S. King wrote:
> The UC07 manual on Bitsavers shows this as a Qbus adapter - although I'd
> sure think it was Unibus from the name. The seller calls it out as Qbus
> and the documents back him/her up.
Yeah. I have one. It's Qbus. Nothing wrong with it - tha
The UC07 manual on Bitsavers shows this as a Qbus adapter - although I'd
sure think it was Unibus from the name. The seller calls it out as Qbus
and the documents back him/her up.
On Fri, Jun 5, 2015 at 5:31 PM, Toby Thain wrote:
> On 2015-06-04 8:49 PM, Ethan Dicks wrote:
>
>> ... Unibus SCSI
On 2015-06-04 8:49 PM, Ethan Dicks wrote:
... Unibus SCSI, OTOH, is
not common, but a joy if you can find one.
This one ends in 8 hours.
http://www.ebay.com/itm/AVIV-Emulex-UC07-SCSI-Quad-Wide-Q-Bus-Digital-Equipment-LSI-11-MicroVAX-PDP-11-/261903555279
--Toby
-ethan
>Ethan Dicks [ethan.di...@gmail.com] wrote:
>did not come with a removable cartridge so I've not been able to spin it up
Yes, one of the annoyances of the RC25 is that you can't spin it up w/o the
removable platter in place. I have only one cartridge myself, and it's
probably bad. Somebody n
On Mon, Jun 1, 2015 at 1:09 PM, Robert Armstrong wrote:
> If you actually get an RC-25 drive working, I'd love to hear about it. I
> have three RC25s (one actually in my 11/725 and two spares) and none of them
> work. They were never very reliable drives, even when brand new, and are
> possibl
> Three RC-25 drives with a dozen-or-so cartridges. We know at least one
drive works.
If you actually get an RC-25 drive working, I'd love to hear about it. I
have three RC25s (one actually in my 11/725 and two spares) and none of them
work. They were never very reliable drives, even when bra
On 2015-Jun-01, at 10:09 AM, Robert Armstrong wrote:
>> Three RC-25 drives with a dozen-or-so cartridges. We know at least one drive
>> works.
>
> If you actually get an RC-25 drive working, I'd love to hear about it. I
> have three RC25s (one actually in my 11/725 and two spares) and none of
Great save!
On Sat, May 30, 2015 at 8:27 PM, Brent Hilpert wrote:
> So Rob and I got onsite yesterday and ended up taking away a small haul of
> DEC equipment.
>
> - Three RC-25 drives with a dozen-or-so cartridges. We know at
> least one drive works.
>
> - We were quite excited
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