18 Oct
1999
18 Oct
'99
10:28 a.m.
--- Bill Sudbrink <bill(a)chipware.com> wrote:
I've hunted around on the web to no avail...
Can anybody give me the specs on these?
Try http://www.doc.ic.ac.uk/~ih/doc/stepper/tm100/ It has _some_ info, but
you didn't say what in particular you were looking for.
-ethan
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18 Oct
18 Oct
10:47 a.m.
you didn't say what in particular you were looking
for.
Well, they have NorthStar QC tags on them dated 8-4-80.
I thought that N* tended to be hard sectored and wanted
to know for sure. There is a little paper tag next to
the metal tag with a "2A" on it, so I'll assume from Don's
message that they are 48 TPI double-sided. Nobody has
said anything so far about hard/soft sectoring...
Thanks,
Bill Sudbrink
10:58 a.m.
On Mon, 18 Oct 1999, Bill Sudbrink wrote:
That is a function of the controller, not the drive. It doesn't care!
- don
you didn't
say what in particular you were looking for.
Well, they have NorthStar QC tags on them dated 8-4-80.
I thought that N* tended to be hard sectored and wanted
to know for sure. There is a little paper tag next to
the metal tag with a "2A" on it, so I'll assume from Don's
message that they are 48 TPI double-sided. Nobody has
said anything so far about hard/soft sectoring... Thanks,
Bill Sudbrink
11:01 a.m.
On Mon, 18 Oct 1999, Bill Sudbrink wrote:
All the 5.25 floppies (exception of course) are hard/soft sector based on
media used. The NS* could use a raft of different drives from the old
sa400 35tr SS to the 96tpi two sided all of course hard sector.
you didn't
say what in particular you were looking for.
Well, they have NorthStar QC tags on them dated 8-4-80.
I thought that N* tended to be hard sectored and wanted
to know for sure. There is a little paper tag next to the metal tag with a "2A" on it, so I'll
assume from Don's
message that they are 48 TPI double-sided. Nobody has
said anything so far about hard/soft sectoring...
The drive don't care. It's the media that is important in this case as
soft sector has only one index hole and the hard sector for NS* uses
11 holes(index plus sectors).
Allison
11:26 a.m.
The drive don't care. It's the media that is
important in this case as
soft sector has only one index hole and the hard sector for NS* uses
11 holes(index plus sectors).
Ah... That makes sense. Although I thought that the index hole
was in a different position. Is the same (drive don't care) true
for 8 inch drives as well?
9:29 p.m.
On Mon, 18 Oct 1999, Bill Sudbrink wrote:
Well, the Shugart 801s and 851s had a jumper that permitted selecting
between 800/850 characteristics and 801/851 characteristics. The
difference is hopefully explained by the following:
The drive
don't care. It's the media that is important in this case as
soft sector has only one index hole and the hard sector for NS* uses
11 holes(index plus sectors).
Ah... That makes sense. Although I thought that the index hole
was in a different position. Is the same (drive don't care) true
for 8 inch drives as well?
Some of the old 8" drives (Shugarts included) did
have the hard-sector
jumpers, but that was to accomodate a peculiarity in the
8" interface.
An 8" drive in hard-sector mode delivers both an index and a sector
pulse. Mostly, the hard-sector jumpering brought into play a couple of
one-shots. Unlike the READY signal, this was never carried over to the
5.25" drives. The READY signal, oddly enough, wasn't present on the
Shugart 400 5.25" original, but was added when 100 tpi drives came along.
Now, most drives with more than 40 cylinders offer an option setting
(even if it's a trace cut) to select disk change or ready. Few 48 tpi
5.25" drives, however, do. One surmise is that this was to make
migration from 8" drives easier.
- don
19 Oct
19 Oct
7:35 a.m.
Don Maslin <donm(a)cts.com> wrote:
Well, the Shugart 801s and 851s had a jumper that
permitted selecting
between 800/850 characteristics and 801/851 characteristics. The
difference is hopefully explained by the following:
Hi
I thought the difference between the 800 and 801 was that
one had the clock separator and the other didn't?
Dwight
Some of the old 8" drives (Shugarts
included) did have the hard-sector
jumpers, but that was to accomodate a
peculiarity in the 8" interface.
11:38 a.m.
On Tue, 19 Oct 1999, Dwight Elvey wrote:
Don Maslin <donm(a)cts.com> wrote:
Well, the 800/801 OEM manual speaks to a 'sector separator' which is
bypassed when the 800 trace is intact. The 850/851 manual, on the other
hand, speaks to a 'data separator' which is invoked when the 851 jumper
is installed. I guess both provide comparable capability, depending on
whether you want to 'see' the sector pulse or not.
- don
Well, the Shugart 801s and 851s had a jumper that
permitted selecting
between 800/850 characteristics and 801/851 characteristics. The
difference is hopefully explained by the following:
Hi
I thought the difference between the 800 and 801 was that
one had the clock separator and the other didn't?
Dwight Some of the old 8" drives (Shugarts
included) did have the hard-sector
jumpers, but that was to accomodate a
peculiarity in the 8" interface.
9039
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7 comments
5 participants
participants (5)
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allisonp＠world.std.com -
bill＠chipware.com -
donm＠cts.com -
elvey＠hal.com -
ethan_dicks＠yahoo.com