16 May
2010
16 May
'10
2:20 a.m.
On 16 May 2010, at 05:07, cctalk-request at classiccmp.org wrote:
Message: 3
Date: Sat, 15 May 2010 20:12:58 +0100
From: Roger Pugh <rogpugh at mac.com>
Subject: Re: Anyone off to VCF-UK?
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Message-ID: <4BEEF23A.8050204 at mac.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 05/15/2010 01:00, Philip Pemberton wrote:
Possibly, I am roughly equidistant from M20 J8 and J9. Where are you?
If I arrange to share a car I won't let apathy reign on the day.
My best MPG car is about 23 so maybe not one of mine though my supercharged Daimler V8 is
very luxurious, it only does 17 mpg!
Roger Holmes.
Hi guys,
Just out of curiosity, is anyone planning to attend the UK Vintage
Computer Festival this year? The one that's running on the 19th and
20th of June at Bletchley Park?
I intend to go for one of the days, but not sure which.
Is anyone interested in a car share from the South East?
16 May
16 May
4 p.m.
Possibly, I am roughly equidistant from M20 J8 and J9.
Where are you?
If I arrange to share a car I won't let apathy reign on the day.
My best MPG car is about 23 so maybe not one of mine though my supercharged Daimler V8 is
very luxurious, it only does 17 mpg!
Roger Holmes.
Roger
I'm a few miles south of Gatwick on the M23
Transport options are
55MPG SAAB 9-3
30MPG Citroen Berlingo
19MPG Bristol
So forgetting the gas guzzler classic its a SAAB 4dr or a Van with seats
for more load capacity.
roger
4:52 p.m.
New subject: Alignment Diskettes
-Sigh-
I figured I'd have no problem finding alignment diskettes for 40 track SS,
40 track DS, and 80 track HD DS diskettes (since google searches always
pulled up about half a dozen companies selling them) and there always seemed
to be a couple companies on Epay selling them. Now that I'm in the market
for them, (got probes for my scope) I can't find the bloody things :(
Anyone have any pointers to places selling them, also may be looking for
3.5" alignment diskettes.
5:52 p.m.
New subject: Alignment Diskettes
On 16 May 2010 at 16:52, Geoffrey Reed wrote:
Anyone have any pointers to places selling them, also
may be looking
for 3.5" alignment diskettes.
Accurite sells alignment (both analog and digital):
http://www.accurite.com/Products.html
They're not cheap.
--Chuck
7:43 p.m.
New subject: Alignment Diskettes
Accurite sells alignment (both analog and digital):
http://www.accurite.com/Products.html
They're not cheap.
Maybe not for hobbists, but I wouldn't mind paying $65 in an analog
alignment diskette for 720K 3 1/2" use.
I still have many 720k drives around, some HP gear uses them :)
9:09 p.m.
New subject: Alignment Diskettes
Hi
I'm relatively sure the track alignment is the same
as the 1.44. You should be able to use a 1.44M alignment
disk.
You won't be able to do a write/read test but you can use
a 720K disk for that.
Dwight
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Accurite sells alignment (both analog and
digital):
http://www.accurite.com/Products.html
They're not cheap.
Maybe not for hobbists, but I wouldn't mind paying $65 in an analog
alignment diskette for 720K 3 1/2" use.
I still have many 720k drives around, some HP gear uses them :)
10:29 p.m.
New subject: Alignment Diskettes
On 16 May 2010 at 21:09, dwight elvey wrote:
I'm relatively sure the track alignment is the
same
as the 1.44. You should be able to use a 1.44M alignment
disk.
I think it depends on the disk, Dwight. A 720K drive may not have
enough read-channel "headroom" to handle a disk made for 1.44MB
drives.
But yes, the tracks are in the same locations.
--Chuck
17 May
17 May
12:39 p.m.
New subject: Alignment Diskettes
On 16 May 2010 at 21:09, dwight elvey wrote:
Do you have any evidence that such an alignment disk exists? I would be
suprised. Why make it? The '720K; one is good for both 720K and 1.44M
drives, so why make one that _only_ works in the latter type?
-tony
I'm relatively sure the track alignment is
the same
as the 1.44. You should be able to use a 1.44M alignment
disk.
I think it depends on the disk, Dwight. A 720K drive may not have
enough read-channel "headroom" to handle a disk made for 1.44MB
drives.
12:37 p.m.
New subject: Alignment Diskettes
Hi
I'm relatively sure the track alignment is the same
as the 1.44. You should be able to use a 1.44M alignment
disk.
I;'ve never heard of there being different _analogue_ alginment disks
(Catseye disks) for 720K and 1.44M 3.5" drives. Certainly the one Ibought
is good for both,
You won't be able to do a write/read test but you can use
a 720K disk for that.
I wouldn't want to write to any part of an alignment disk. Just in case
the positioner decides to fail and I end up overwriting the catseye
pattern.
-tony
1:45 p.m.
New subject: Alignment Diskettes
On 17 May 2010 at 20:37, Tony Duell wrote:
I;'ve never heard of there being different
_analogue_ alginment disks
(Catseye disks) for 720K and 1.44M 3.5" drives. Certainly the one
Ibought is good for both,
No, but Accurite sells both analog(ue) and digital alignment disks.
There are some 1.44MB drives of recent manufacture that *cannot* read
or write 720K (2D) media (there's no sensor or density select pin).
Another case of the plague called "cost reduction". But the upshot
may be that a *modern* digital alignment diskette is recorded at the
500 KHz data rate.
This admittedly is speculation, but should also be taken as a warning-
-and something to ask the vendor of said diskette before purchase.
--Chuck
12:35 p.m.
New subject: Alignment Diskettes
I still have many 720k drives around, some HP gear
uses them :)
FWIW, I've had no problems aligning the Sony 3.5" drives used in older HP
stuff with a normal alignment disk.
I really must work out what the alignment tool really was. It's like a
screwdriuver with a pinion and spigot at the business end. The spigot
locates in a hole in the drive chassis, the pinion meshes with teeth on
the stepper motor flange and it makes moveing the motor a lot easier. I
need to work out the number of teeth and the pitch, and I'll have a go at
milling one.
-tony
1:47 a.m.
New subject: Alignment Diskettes
--- On Sun, 5/16/10, Geoffrey Reed <geoffr at zipcon.net> wrote:
Anyone have any pointers to places selling them, also
may
be looking for 3.5" alignment diskettes.
Try www.accurite.com. They are the successor to Dysan's
alignment disk business. Look "Floppy Drive Diagnostics"
at the end of the "Products' page:
http://www.accurite.com/Products.html
http://www.accurite.com/AAD.html
--Bill
5333
days inactive
5334
days old
11 comments
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participants (8)
-
ard＠p850ug1.demon.co.uk -
cclist＠sydex.com -
dkelvey＠hotmail.com -
geoffr＠zipcon.net -
pu1bzz.listas＠gmail.com -
roger.holmes＠microspot.co.uk -
rogpugh＠mac.com -
wmaddox＠pacbell.net