18 Jul
2018
18 Jul
'18
7:01 p.m.
https://www.ebay.com/itm/292646012304
local pickup only
the reserve is >$1500
I would guess the CDC Winchesters are toast if they haven't had their heads locked
18 Jul
18 Jul
7:04 p.m.
oh, and this isn't me.
I just had a really bad experience with them where they "lost" 2 of the 5 Priam
disk
drives I bought from them, so I guess local pickup in Rochester NY is a good thing.
On 7/18/18 4:01 PM, Al Kossow via cctalk wrote:
https://www.ebay.com/itm/292646012304
local pickup only
the reserve is >$1500
I would guess the CDC Winchesters are toast if they haven't had their heads locked
19 Jul
19 Jul
3:53 a.m.
On Wed, 18 Jul 2018, Al Kossow wrote:
https://www.ebay.com/itm/292646012304
local pickup only
the reserve is >$1500
ROTFL
A very big and expensive door stopper without OS tapes.
But most importantly: the CPU board is missing!
The card in slot 2 appears to be an additional SIO card.
This is a model 20, quite low-end. We have a model 32 (much rarer, I
haven't found anyone else with a model 32), but it is non-functional
because I have no tapes. The SMD disk has too many errors to recover a
functional system.
Christian
1:20 p.m.
On Thu, Jul 19, 2018 at 12:53 AM, Christian Corti via cctalk <
cctalk at classiccmp.org> wrote:
On Wed, 18 Jul 2018, Al Kossow wrote:
There's a Model 31 at LCM+L (used to be mine). If anyone ever does recover
media for these things, it'd be nice to get it running...
- Josh
https://www.ebay.com/itm/292646012304
local pickup only
the reserve is >$1500
ROTFL
A very big and expensive door stopper without OS tapes.
But most importantly: the CPU board is missing!
The card in slot 2 appears to be an additional SIO card.
This is a model 20, quite low-end. We have a model 32 (much rarer, I
haven't found anyone else with a model 32), but it is non-functional
because I have no tapes. The SMD disk has too many errors to recover a
functional system.
Christian
3:36 p.m.
A very big and
expensive door stopper without OS tapes.
But most importantly: the CPU board is missing!
The card in slot 2 appears to be an additional SIO card.
This is a model 20, quite low-end. We have a model 32 (much rarer, I
haven't found anyone else with a model 32), but it is non-functional
because I have no tapes. The SMD disk has too many errors to recover a
functional system.
There's a Model 31 at LCM+L (used to be mine). If anyone ever does recover
media for these things, it'd be nice to get it running...
- Josh 
20 Jul
20 Jul
9:20 a.m.
IIRC that was one of the first donations to our club back in 2005
On Fri, Jul 20, 2018 at 1:04 AM Evan Koblentz via cctech <
cctech at classiccmp.org> wrote:
recover
A very
big and expensive door stopper without OS tapes.
But most importantly: the CPU board is missing!
The card in slot 2 appears to be an additional SIO card.
This is a model 20, quite low-end. We have a model 32 (much rarer, I
haven't found anyone else with a model 32), but it is non-functional
because I have no tapes. The SMD disk has too many errors to recover a
functional system.
There's a Model 31 at LCM+L (used to be mine). If anyone ever does media for these things, it'd be nice to get
it running...
- Josh
VCF has one but I'm not sure which model it is. I can check next week.
We also have some tapes, again, I don't know which ones.
5:43 p.m.
I have one model 21 and one model 11. Finch drive and ST506 drive
respectively. Not sure about the status of disks, but I have a spare Finch
drive. I also have three install tapes. One Sadie 3.5 and two ZEUS 3.21.
When time permits I will read those. AJ Palmgren read a tape with a tar
archive I made myself on this machine many years ago. The ouput I got from
AJ was Saleae logic analyzer dumps. One per track read. He is using a
quite standard Wangtek 5099 drive where he is able to control the head in
more detail. Some dumps were from tracks which were spot on one of the
tracks on the tape. Others were not a full hit. I had to test all of them.
I created a small program that decoded the MFM data off the tracks. It
processed gigabytes worth of samples. Checked the CRC and wrote it to file
so I could recover the archieve.
http://www.datormuseum.se/computers/others/zilog-s8000/extract-s8000-tapes
Credits goes to AJ Palmgren for reading the tape and to David Gesswein from
whom I stole and modified the MFM decoder.
And as Al wrote: No it is not at all QIC. The drive has four fixed tracks
and the encoding is MFM.
/Mattis
fredag 20 juli 2018 skrev Al Kossow via cctalk <cctalk at classiccmp.org>:
On 7/20/18 6:20 AM, Bill Degnan via cctalk wrote:
> We also have some tapes, again, I don't
know which ones.
Be VERY careful with those if you find them. They are NOT
QIC-compatible and the belts WILL be bad.
10:26 p.m.
On 7/20/18 2:43 PM, Mattis Lind wrote:
And as Al wrote: ?No it is not at all QIC. The drive
has four fixed tracks and the encoding is MFM.?
These 4-track fixed-head drives were common drives prior to the invention of movable head
devices. TI used them in 990
systems as well as early 80 companies like Onyx and in particular DSD, which used the
Kennedy 6455 of which I have
several out of the DSDs with good capstans that I had hoped to try recovering the TI and
other carts on.
I have two Zeus carts:
f77 src & lib src tape zeus 3.21
games executable & virg game src zeus 5.1
21 Jul
21 Jul
12:07 a.m.
On Sat, Jul 21, 2018 at 3:26 AM, Al Kossow via cctalk
<cctalk at classiccmp.org> wrote:
On 7/20/18 2:43 PM, Mattis Lind wrote:
I seem to remember the original QIC11 standard was (or at least included) a
4 track version. And the later 9 track format kept those 4 tracks in the same
place and put 5 more, one on each side and 3 between them if you see what
I mean.
So unless you need to read 2 tracks simultaneously (e.g. becuase it uses the
encoded where a pulse on one track is a '0', a pulse on the other is a '1'
and
pulses on both together are a marker) you can probably get the data off the tape
with a raw 4 track or 9 track drive and a custom controller.
-tony
And as Al wrote: No it is not at all QIC. The
drive has four fixed tracks and the encoding is MFM.
These 4-track fixed-head drives were common drives prior to the invention of movable head
devices. TI used them in 990
2:16 a.m.
I seem to remember the original QIC11 standard was (or at least included) a
4 track version. And the later 9 track format kept those 4 tracks in the
same
place and put 5 more, one on each side and 3 between them if you see what
I mean.
So unless you need to read 2 tracks simultaneously (e.g. becuase it uses
the
encoded where a pulse on one track is a '0', a pulse on the other is a
'1'
and
pulses on both together are a marker) you can probably get the data off
the tape
with a raw 4 track or 9 track drive and a custom controller.
That didn't work when AJ read my S8000 tapes at least. Some of the tracks
had to be read a few stepper motor steps off the nominal track to give a
good read.
And I did the decoding in software. No custom conroller hardware.
/Mattis
-tony
11:25 a.m.
On 7/20/18 2:43 PM, Mattis Lind wrote:
Credits goes to AJ Palmgren for reading the tape and
to David Gesswein from whom I stole and modified the MFM decoder.?
And as Al wrote: ?No it is not at all QIC. The drive has four fixed tracks and the
encoding is MFM.?
I hadn't looked at Al's page in a while, I see there was a long discussion of
removing the gunk stuck to the surface
from the belt, with no real solution. I need to do some
more experiments with solvents on scratch tapes.
5:25 p.m.
On Thu, Jul 19, 2018 at 2:16 PM, Al Kossow via cctalk <cctalk at classiccmp.org
wrote:
On 7/19/18 10:20 AM, Josh Dersch via cctalk wrote:
SMD Disks, 40mb Memorex. Don't recall the model numbers, I can dig it up
if you need.
- Josh
There's a Model 31 at LCM+L (used to be
mine).
what kind of disk does it have?
2171
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13 comments
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participants (7)
-
aek＠bitsavers.org -
ard.p850ug1＠gmail.com -
billdegnan＠gmail.com -
cc＠informatik.uni-stuttgart.de -
cctalk＠snarc.net -
derschjo＠gmail.com -
mattislind＠gmail.com