6 Apr
2005
6 Apr
'05
9:05 p.m.
Are you sure that Drive A on a PC won't work on a straight cable?
Something in the back of my mind says that I used to change the drive
select jumper *AND* make sure a terminator was installed for the floppy
to work fine on a straight cable as Drive A. I do know that not having a
terminator installed (on the last drive of the string) can make for some
really strange and intermittent behavior on both HDs and Floppy Drives.
On the hard drive cable the twist merely changed the drive select signals,
on the floppy drive cable both the drive select and motor on gets twisted.
The floppy drive cable must be twisted to have drive A work properly the
hard drive can work with or without a twist.
Randy
www.s100-manuals.com
6 Apr
6 Apr
9:21 p.m.
Nope, Drive A's require a portion of the cable to be flipped over, Drive
B's use straight cable on most controller/drive setups... though I do
recall what you're saying about the drive selects and such, I think on
the old AT's with 1/2 height 5.25" drives you used to set the drive
select and such... ah the dusty old memories in ones rattle-brain ;-)
Curt
Marvin Johnston wrote:
Are you sure that Drive A on a PC won't work on a
straight cable?
Something in the back of my mind says that I used to change the drive
select jumper *AND* make sure a terminator was installed for the floppy
to work fine on a straight cable as Drive A. I do know that not having a
terminator installed (on the last drive of the string) can make for some
really strange and intermittent behavior on both HDs and Floppy Drives.
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On the hard drive cable the twist merely changed
the drive select signals,
on the floppy drive cable both the drive select and motor on gets twisted.
The floppy drive cable must be twisted to have drive A work properly the
hard drive can work with or without a twist.
Randy
www.s100-manuals.com
9:34 p.m.
From: "Marvin Johnston" <marvin at rain.org>
Sent: Wednesday, April 06, 2005 11:05 PM
Are you sure that Drive A on a PC won't work on a straight cable?
Something in the back of my mind says that I used to change the drive
select jumper *AND* make sure a terminator was installed for the floppy
to work fine on a straight cable as Drive A. I do know that not having a
terminator installed (on the last drive of the string) can make for some
really strange and intermittent behavior on both HDs and Floppy Drives.
>
> On the hard drive cable the twist merely changed the drive select
> signals,
> on the floppy drive cable both the drive select and motor on gets
> twisted.
> The floppy drive cable must be twisted to have drive A work properly the
> hard drive can work with or without a twist.
>
>
> Randy
> www.s100-manuals.com
I'm sure, pin 10 is normally the 1st drive select line on a PC this line is
the motor on for drive A. Without the twist you could either select the
drive or have the motor spin but not both.
This also means that you can not use a PC twisted cable on a classic system.
On the other hand I've made twisted cables for legacy systems that only
twist pins 10 thru 12 to use 3.5" drives with no jumpers on classic systems.
I have the pins documented on my website, please note I have the pins
documented both as standard SA400 and the IBM BS standard.
Randy
www.s100-manuals.com
7 Apr
7 Apr
3:50 p.m.
Is your drive jumpered for "Motor ON on drive select"?
On Wed, 6 Apr 2005, Marvin Johnston wrote:
Are you sure that Drive A on a PC won't work on a
straight cable?
Something in the back of my mind says that I used to change the drive
select jumper *AND* make sure a terminator was installed for the floppy
to work fine on a straight cable as Drive A. I do know that not having a
terminator installed (on the last drive of the string) can make for some
really strange and intermittent behavior on both HDs and Floppy Drives.
>
> On the hard drive cable the twist merely changed the drive select signals,
> on the floppy drive cable both the drive select and motor on gets twisted.
> The floppy drive cable must be twisted to have drive A work properly the
> hard drive can work with or without a twist.
7200
days inactive
7200
days old
3 comments
4 participants
participants (4)
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cctalk＠randy482.com -
cisin＠xenosoft.com -
curt＠atarimuseum.com -
marvin＠rain.org