jj asks: secondary floppy controller, reading hundreds of floppies

jj asks: secondary floppy controller, reading hundreds of floppies

Post by Jeff Jon » Thu, 03 May 2001 01:36:09



Is anybody running >1 floppy controller via Linux
(secondary address, Compaticard, etc) ?
If so, how?

I have hundreds of floppy disks I need to read and archive to CD.
I figure that using 2 controllers would allow having 2 drives
running simultaneously, or are my suspicions correct that despite having
primary/secondary addresses, they can't share the DMA and IRQ
so only one's reading/writing at a time?
What of the floppy-tape interface cards?

I have a few SCSI interfaced iomega flopticals,
but I'd rather not risk those drives on possibly damaged floppies.

A more far out solution: use regular floppy drives via a SCSI-floppy
"bridge card", if anyone's gotten that running.
I wish I had the time to handle such driver work myself right now.
--
Jeffrey Jonas

The original Dr. JCL and Mr .hide

 
 
 

jj asks: secondary floppy controller, reading hundreds of floppies

Post by uncle fredd » Thu, 03 May 2001 09:09:20




Quote:> Is anybody running >1 floppy controller via Linux (secondary address,
> Compaticard, etc) ? If so, how?

> I have hundreds of floppy disks I need to read and archive to CD. I
> figure that using 2 controllers would allow having 2 drives running
> simultaneously, or are my suspicions correct that despite having
> primary/secondary addresses, they can't share the DMA and IRQ so only
> one's reading/writing at a time? What of the floppy-tape interface
> cards?

I suspect you might be right, floppies use IRQ 6

 
 
 

jj asks: secondary floppy controller, reading hundreds of floppies

Post by hac » Thu, 03 May 2001 12:11:38



> Is anybody running >1 floppy controller via Linux
> (secondary address, Compaticard, etc) ?
> If so, how?

> I have hundreds of floppy disks I need to read and archive to CD.
> I figure that using 2 controllers would allow having 2 drives
> running simultaneously, or are my suspicions correct that despite having
> primary/secondary addresses, they can't share the DMA and IRQ
> so only one's reading/writing at a time?
> What of the floppy-tape interface cards?

A radical solution: use more than one PC.  For what you want to do, a
stack of junker 486's should do.  Network them, open an xterm for
each, and away you go.

It may not be elegant, but it's cheap.

--

 
 
 

jj asks: secondary floppy controller, reading hundreds of floppies

Post by Jeff Jon » Thu, 03 May 2001 13:56:54


Quote:>> Is anybody running >1 floppy controller via Linux
>> If so, how?
>A radical solution: use more than one PC.  For what you want to do, a
>stack of junker 486's should do.  Network them, open an xterm for
>each, and away you go.

        ...

Yes, that's a workaround, but I'm still frustrated at the way the
PC interface was crippled for the PC and we never recovered.
Pre-PC systems used all 4 floppies on the cable.
Older floppy controllers have jumpers for primary/secondary addresses,
but with shared IRQ and DMA, I can't see them working at the same time :-(
--
Jeffrey Jonas

The original Dr. JCL and Mr .hide

 
 
 

jj asks: secondary floppy controller, reading hundreds of floppies

Post by Norman Levi » Thu, 03 May 2001 22:02:41


My old Gateway has a 3.5 inch A drive and 5.25 B drive.  Think it uses both
at the same time.


> >> Is anybody running >1 floppy controller via Linux
> >> If so, how?

> >A radical solution: use more than one PC.  For what you want to do, a
> >stack of junker 486's should do.  Network them, open an xterm for
> >each, and away you go.
>         ...

> Yes, that's a workaround, but I'm still frustrated at the way the
> PC interface was crippled for the PC and we never recovered.
> Pre-PC systems used all 4 floppies on the cable.
> Older floppy controllers have jumpers for primary/secondary addresses,
> but with shared IRQ and DMA, I can't see them working at the same time :-(
> --
> Jeffrey Jonas

> The original Dr. JCL and Mr .hide

--
Norman Levin
VM/Dynamics, Inc - Specializing in VM, AIX and Linux Education
Office 817 421-0123    Mobile  817 919-8781    Fax 214-722-1779
 
 
 

1. Floppy controller throughput for floppy tape drives - request

: I wonder if someone could help me with a minor issue regarding the use of
: floppy controller tape drives.

: needs a floppy controller with at least a 1Mb/sec throughput capability. No
: problem I thought, I'll get the info. from my motherboard manual. Did I? Did
: I buffalo!

: According to my motherboard manual, the floppy/i-o controller is a Winbond
: 83877 unit, but I have no idea if this will yield 1Mb/Sec throughput, as
  ^^^^^
All by heart, I'm sure the chip type needs to end with ..77AA.
You need a FDC that is capable of doing EHD (Enhanced High Density) which is
related to 2M8 floppies. Although this hasn't really become a standard, many
of the (already older) machines nowadays do silently support 1MB/s.
If you have a standard controller you're stuck to 500K/s.
I'm not sure if there's diagnostics software out there that can tell you
what kind of FDC you have, but for the ..77AA type of chip it is easy
because it supports some sort of identify command. (Check the chips data
sheets.)

Regards, Wim.


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