If I remember correctly, The 1.2M drive uses a track 1/2 the width of the 360K drive. If you format a disk and write data with the same drive, there is no problem. The 1.2 drive can read down the middle of a 360K fat track and all is OK. The 360K drive can read the 1.2M skinny track and all is probably OK. The problem comes in when you use a 1.2M drive to write on a diskette that was previously written by a 360K drive. The skinny track is now on top of the fat track. The 360K drive will certainly have problems. It will read the new data in addition to 1/2 of the old data.
Regards,
Tom Sanderson
wts(a)exo.com
http://exo.com/~wts/wts10005.HTM Virtual Altair Museum
-----Original Message-----
From: Mike Allison [SMTP:mallison@konnections.com]
Sent: Thursday, February 12, 1998 9:53 PM
To: Discussion re-collecting of classic computers
Subject: Re: Disk problems/questions.
I had an IBM 360k that I was using, no compliants. I started having
data problems moving stuff from a true 1.2M to the 360. Later, I put a
360 in the other computer and I still had problems. Finally, I figured
it out, the IBM was either out of alignment, or shot...
Could it just simply be the 360k drive?
-Mike
Barry Peterson wrote:
>
> On Wed, 11 Feb 1998 07:27:01 -0500, you said:
>
> >Scandisk works excellent for me here even on my Leading Edge XT. It's
> >something your doing not scandisk.
>
> Maybe it's a difference between the XT and AT BIOS or how the format
> command is executed, I wasn't "doing" anything but:
>
> 1) format b:
> (Responding to prompts as appropriate)
> 2)scandisk b:
> (Error message reported by said scandisk program)
>
> No parameters, no modifiers, nothing more than the above two commands
> _______________
>
> Barry Peterson bmpete(a)swbell.net
> Husband to Diane, Father to Doug,
> Grandfather to Zoe and Tegan.
Just came across an Amiga/Atari switchable mouse, and was wondering if it
would also work on my C-64. Does anyone know if c-64 and amiga had the same
pinouts for the joystick port?
-John Higginbotham-
-limbo.netpath.net-
At 11:00 AM 2/15/98 EST, you wrote:
>the only thing i know that can happen to them is burned out pixels which
is to
>be expected, and not really that noticeable unless there are several clumped
>together.
I thought all the pixels that would go bad do so during the assembly
process. Do they go bad on their own over time?
-John Higginbotham-
-limbo.netpath.net-
With all the discussion of disk exercisers, now might be an
appropriate time to post this stuff.
I have found a number of DEC and DEC-associated test sets. I have
three in my possesion and will wait to see if there is any response
to get the rest of the units. They seem to be in good shape,
w/manuals and adapter cables. I cant really *test* any of them
because I don't own any of the drives they are for. O well.....
I have here field test boxes for:
RK07/07
TB216A (CDC) (2 available)
RM03/05 (3 available)
Also there are:
DEC TDR Analyzer
Wilson Labs SX-530 Disk Memory Exerciser
Information Storage Tech. 7330 DDU Tester
Memorex 800 Disc Storage System Tester (7 of these available)
Memorex Mecanical Alignment Kit
Magnetic Peripherals Field Test Unit TB3A2A for RM0 series (3 avail)
DEC RM06/07 Carriage alignment tool
DEC RM02/3/5 Head Carriage tools (2 avail)
Condition of the devices I have in hand appears to be good, the
others have not been inspected by me personally, but the owner says
they're all about the same.
Prices on these units: (US) $50? $75? More? Less?
I am in Southern California. These devices are all in 'Zero'-type
cases.. shipping should not be a problem.
e-mail jpl15(a)netcom.com
Cheers
John
In a message dated 2/15/98 2:15:53 AM Eastern Daylight Time, william(a)ans.net
writes:
<< I was just thinking about future collectables like laptops, and I do have
a question:
Does anyone know how well LCDs hold up against time (provided, of course,
that they are not cracked!)? >>
the only thing i know that can happen to them is burned out pixels which is to
be expected, and not really that noticeable unless there are several clumped
together.
david
At 05:11 AM 2/12/98 +0000, you wrote:
>No, it won't. One of my great disappointments. I've had it explained
>to me but I can't recall why. That's an Amiga-Atari 'ST' mouse.
>It wont work on an 8-bit atari neither
Dang. So I'll have to buy an Amiga to use this mouse. (Yet another excuse
to get another computer!)
-John Higginbotham-
-limbo.netpath.net-
<Which reminds me: why didn't IEEE-488 ever become a big hit in the
Otherwise known as GPIB.
<computer biz? It's been around since the 60's, is standard, has good
<performance, has IC support, can handle a bunch of devices, etc., but it
<became relagated to a niche of scientific instrument control for some
<reason.
The few chips to support it were slow, it used specialized cables and
connectors and it was as costly to impliment as SCSI. As a future bus
it didn't offer the speed potential.
Allison
<>Does anyone know how well LCDs hold up against time (provided, of course
<>that they are not cracked!)?
There is no finite life assuming they havent been abused.
My PX-8 is from around 85ish and still works great. I have a number of
other small test gear that are older.
Allison
