ISA and IDE Compatability

April 18, 2011 at 14:08:54
Specs: Windows 98, Pentium 4 2.93 ghz/2 ghz ram
A few weeks ago I was asked if I could do a restore on an old backup from the early 1990's. The problem was that the backup was on 5.25 floppy disks which I didn't have. I don't like failure, so today I'm on a mission of discovering if an old 5.25" floppy drive would be compatable running as a B floppy drive on a modern board using IDE FDD. I have an old computer with an ISA board with the slider (rather than pins) ribbon cable with a 3.5" floppy drive using a slider to pin adapter. I thried inserting the ribbon cable into a modern motherboard's FDD slot and it fit. The only problem is that the ISA board has 34 pins and the modern board has 33 pins (one bkank spot). My question is: is the BUS the same and will both drives work on the modern board or do I have to dig up an old computer to operate the 5.25" floppy drive?

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#1
April 18, 2011 at 14:30:47
The Interface will be the same. The problem you are likely to have is the BIOS. Will the BIOS recognise a 5.25" floppy drive. A lot of modern ones do not.

Stuart


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#2
April 18, 2011 at 14:39:00
The missing pin is a key Make sure that you are plugged the right way. A 'B' drive is connected before the twist. You have to select the drive type in BIOS. Make sure you have the proper drive for the floppies, A 360kb is not going to read a 1.2Mb.

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#3
April 18, 2011 at 14:48:41
Yeah my AWARD Pheonix BIOS recognizes both 3.5 and 5.25 floppy drives. Got to love GIGABYTE boards for that. I checked EBAY and there's lots of old drives listed for from $10 to $50 so no problem finding one.
I think this one is problem solved!
Thank You very much.
Tom

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#4
April 19, 2011 at 00:36:44
As Wizard Fred says, there are two types of 5.25 drives. Your bios may recognize a 1.2 but may not see a 360K. So make sure you get a 1.2 as it will read both 360 and 1.2 disks.

Obama's a 2012'er. That explains EVERYTHING..


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#5
April 19, 2011 at 08:12:27
Hi DAVE;
Yeah no problem with the BIOS . It recognizes 360k and 1.2m in the 5.25' disks and 760k ;1.44m; and 2.88m in the 3.5" disks but I think I'll have to make sure I get a high density drive.
Thanks for the heads up about that.
Tom

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