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Article #35

Re: floppy drive error

#35
From: Roger Hamlett
Date: Fri, 14 Apr 2000 00:00
34 lines
2704 bytes
Steve wrote in message ...
>Yes........but if this is the case why does it access the floppy
before
>giving the error?
>
>"Roger Hamlett" <roger@ttelmah.demon.co.uk> wrote in message
>news:955623051.18364.5.nnrp-06.9e988e54@news.demon.co.uk...
>>
>> Steve wrote in message
<_7aJ4.2070$GP3.11890@typhoon.nyroc.rr.com>...
>> >Yes will boot to dos. No twist.
>> This is your problem. The first floppy, should have the twist. I
>> suspect you may have the BIOS set to 'swap A/B' (an option for this
>> exists in most BIOS's), so you actually have drive 'B' attached,
but
>> being seen as 'A' from DOS or W9x. In NT, the drivers ignore the
BIOS,
>> and are finding no drive A attached...
The problem is that it depends on how your drive is attached. The
original floppy interface design, had a single 'motor on' select line,
and four seperate 'drive select' lines. IBM elected to make the
interface more complex, by just supporting two drives, adding a second
'motor select' line, twisting this into the right position on the
drive, and leaving the 'drive select' lines all joined. This was
fractionally cheaper to build in the control board, but required the
cable twist. Different drives respond differently to the control
combinations, so if a drive is on the 'untwisted' part of the cable,
it is fairly common for it to display the 'select' light, when the
select signal is received, and (depending on the make), even step the
heads, but no data is returned. This gives exactly your drive
symptoms...

Best Wishes
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From: "Roger Hamlett" <roger@ttelmah.demon.co.uk>
Subject: Re: floppy drive error
Date: 2000/04/14
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